text: import copy
  import json
  import operator
  import re
  from collections import OrderedDict
  from functools import partial, reduce, update_wrapper
  from urllib.parse import quote as urlquote
  
  from django import forms
  from django.conf import settings
  from django.contrib import messages
  from django.contrib.admin import helpers, widgets
  from django.contrib.admin.checks import (
      BaseModelAdminChecks, InlineModelAdminChecks, ModelAdminChecks,
  )
  from django.contrib.admin.exceptions import DisallowedModelAdminToField
  from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
  from django.contrib.admin.utils import (
      NestedObjects, construct_change_message, flatten_fieldsets,
      get_deleted_objects, lookup_needs_distinct, model_format_dict,
      model_ngettext, quote, unquote,
  )
  from django.contrib.admin.views.autocomplete import AutocompleteJsonView
  from django.contrib.admin.widgets import (
      AutocompleteSelect, AutocompleteSelectMultiple,
  )
  from django.contrib.auth import get_permission_codename
  from django.core.exceptions import (
      FieldDoesNotExist, FieldError, PermissionDenied, ValidationError,
  )
  from django.core.paginator import Paginator
  from django.db import models, router, transaction
  from django.db.models.constants import LOOKUP_SEP
  from django.db.models.fields import BLANK_CHOICE_DASH
  from django.forms.formsets import DELETION_FIELD_NAME, all_valid
  from django.forms.models import (
      BaseInlineFormSet, inlineformset_factory, modelform_defines_fields,
      modelform_factory, modelformset_factory,
  )
  from django.forms.widgets import CheckboxSelectMultiple, SelectMultiple
  from django.http import HttpResponseRedirect
  from django.http.response import HttpResponseBase
  from django.template.response import SimpleTemplateResponse, TemplateResponse
  from django.urls import reverse
  from django.utils.decorators import method_decorator
  from django.utils.html import format_html
  from django.utils.http import urlencode
  from django.utils.inspect import get_func_args
  from django.utils.safestring import mark_safe
  from django.utils.text import capfirst, format_lazy, get_text_list
  from django.utils.translation import gettext as _, ngettext
  from django.views.decorators.csrf import csrf_protect
  from django.views.generic import RedirectView
  
  IS_POPUP_VAR = '_popup'
  TO_FIELD_VAR = '_to_field'
  
  
  HORIZONTAL, VERTICAL = 1, 2
  
  
  def get_content_type_for_model(obj):
      # Since this module gets imported in the application's root package,
      # it cannot import models from other applications at the module level.
      from django.contrib.contenttypes.models import ContentType
      return ContentType.objects.get_for_model(obj, for_concrete_model=False)
  
  
  def get_ul_class(radio_style):
      return 'radiolist' if radio_style == VERTICAL else 'radiolist inline'
  
  
  class IncorrectLookupParameters(Exception):
      pass
  
  
  # Defaults for formfield_overrides. ModelAdmin subclasses can change this
  # by adding to ModelAdmin.formfield_overrides.
  
  FORMFIELD_FOR_DBFIELD_DEFAULTS = {
      models.DateTimeField: {
          'form_class': forms.SplitDateTimeField,
          'widget': widgets.AdminSplitDateTime
      },
      models.DateField: {'widget': widgets.AdminDateWidget},
      models.TimeField: {'widget': widgets.AdminTimeWidget},
      models.TextField: {'widget': widgets.AdminTextareaWidget},
      models.URLField: {'widget': widgets.AdminURLFieldWidget},
      models.IntegerField: {'widget': widgets.AdminIntegerFieldWidget},
      models.BigIntegerField: {'widget': widgets.AdminBigIntegerFieldWidget},
      models.CharField: {'widget': widgets.AdminTextInputWidget},
      models.ImageField: {'widget': widgets.AdminFileWidget},
      models.FileField: {'widget': widgets.AdminFileWidget},
      models.EmailField: {'widget': widgets.AdminEmailInputWidget},
      models.UUIDField: {'widget': widgets.AdminUUIDInputWidget},
  }
  
  csrf_protect_m = method_decorator(csrf_protect)
  
  
  class BaseModelAdmin(metaclass=forms.MediaDefiningClass):
      """Functionality common to both ModelAdmin and InlineAdmin."""
  
      autocomplete_fields = ()
      raw_id_fields = ()
      fields = None
      exclude = None
      fieldsets = None
      form = forms.ModelForm
      filter_vertical = ()
      filter_horizontal = ()
      radio_fields = {}
      prepopulated_fields = {}
      formfield_overrides = {}
      readonly_fields = ()
      ordering = None
      sortable_by = None
      view_on_site = True
      show_full_result_count = True
      checks_class = BaseModelAdminChecks
  
      def check(self, **kwargs):
          return self.checks_class().check(self, **kwargs)
  
      def __init__(self):
          # Merge FORMFIELD_FOR_DBFIELD_DEFAULTS with the formfield_overrides
          # rather than simply overwriting.
          overrides = copy.deepcopy(FORMFIELD_FOR_DBFIELD_DEFAULTS)
          for k, v in self.formfield_overrides.items():
              overrides.setdefault(k, {}).update(v)
          self.formfield_overrides = overrides
  
      def formfield_for_dbfield(self, db_field, request, **kwargs):
          """
          Hook for specifying the form Field instance for a given database Field
          instance.
  
          If kwargs are given, they're passed to the form Field's constructor.
          """
          # If the field specifies choices, we don't need to look for special
          # admin widgets - we just need to use a select widget of some kind.
          if db_field.choices:
              return self.formfield_for_choice_field(db_field, request, **kwargs)
  
          # ForeignKey or ManyToManyFields
          if isinstance(db_field, (models.ForeignKey, models.ManyToManyField)):
              # Combine the field kwargs with any options for formfield_overrides.
              # Make sure the passed in **kwargs override anything in
              # formfield_overrides because **kwargs is more specific, and should
              # always win.
              if db_field.__class__ in self.formfield_overrides:
                  kwargs = {**self.formfield_overrides[db_field.__class__], **kwargs}
  
              # Get the correct formfield.
              if isinstance(db_field, models.ForeignKey):
                  formfield = self.formfield_for_foreignkey(db_field, request, **kwargs)
              elif isinstance(db_field, models.ManyToManyField):
                  formfield = self.formfield_for_manytomany(db_field, request, **kwargs)
  
              # For non-raw_id fields, wrap the widget with a wrapper that adds
              # extra HTML -- the "add other" interface -- to the end of the
              # rendered output. formfield can be None if it came from a
              # OneToOneField with parent_link=True or a M2M intermediary.
              if formfield and db_field.name not in self.raw_id_fields:
                  related_modeladmin = self.admin_site._registry.get(db_field.remote_field.model)
                  wrapper_kwargs = {}
                  if related_modeladmin:
                      wrapper_kwargs.update(
                          can_add_related=related_modeladmin.has_add_permission(request),
                          can_change_related=related_modeladmin.has_change_permission(request),
                          can_delete_related=related_modeladmin.has_delete_permission(request),
                          can_view_related=related_modeladmin.has_view_permission(request),
                      )
                  formfield.widget = widgets.RelatedFieldWidgetWrapper(
                      formfield.widget, db_field.remote_field, self.admin_site, **wrapper_kwargs
                  )
  
              return formfield
  
          # If we've got overrides for the formfield defined, use 'em. **kwargs
          # passed to formfield_for_dbfield override the defaults.
          for klass in db_field.__class__.mro():
              if klass in self.formfield_overrides:
                  kwargs = {**copy.deepcopy(self.formfield_overrides[klass]), **kwargs}
                  return db_field.formfield(**kwargs)
  
          # For any other type of field, just call its formfield() method.
          return db_field.formfield(**kwargs)
  
      def formfield_for_choice_field(self, db_field, request, **kwargs):
          """
          Get a form Field for a database Field that has declared choices.
          """
          # If the field is named as a radio_field, use a RadioSelect
          if db_field.name in self.radio_fields:
              # Avoid stomping on custom widget/choices arguments.
              if 'widget' not in kwargs:
                  kwargs['widget'] = widgets.AdminRadioSelect(attrs={
                      'class': get_ul_class(self.radio_fields[db_field.name]),
                  })
              if 'choices' not in kwargs:
                  kwargs['choices'] = db_field.get_choices(
                      include_blank=db_field.blank,
                      blank_choice=[('', _('None'))]
                  )
          return db_field.formfield(**kwargs)
  
      def get_field_queryset(self, db, db_field, request):
          """
          If the ModelAdmin specifies ordering, the queryset should respect that
          ordering.  Otherwise don't specify the queryset, let the field decide
          (return None in that case).
          """
          related_admin = self.admin_site._registry.get(db_field.remote_field.model)
          if related_admin is not None:
              ordering = related_admin.get_ordering(request)
              if ordering is not None and ordering != ():
                  return db_field.remote_field.model._default_manager.using(db).order_by(*ordering)
          return None
  
      def formfield_for_foreignkey(self, db_field, request, **kwargs):
          """
          Get a form Field for a ForeignKey.
          """
          db = kwargs.get('using')
  
          if 'widget' not in kwargs:
              if db_field.name in self.get_autocomplete_fields(request):
                  kwargs['widget'] = AutocompleteSelect(db_field.remote_field, self.admin_site, using=db)
              elif db_field.name in self.raw_id_fields:
                  kwargs['widget'] = widgets.ForeignKeyRawIdWidget(db_field.remote_field, self.admin_site, using=db)
              elif db_field.name in self.radio_fields:
                  kwargs['widget'] = widgets.AdminRadioSelect(attrs={
                      'class': get_ul_class(self.radio_fields[db_field.name]),
                  })
                  kwargs['empty_label'] = _('None') if db_field.blank else None
  
          if 'queryset' not in kwargs:
              queryset = self.get_field_queryset(db, db_field, request)
              if queryset is not None:
                  kwargs['queryset'] = queryset
  
          return db_field.formfield(**kwargs)
  
      def formfield_for_manytomany(self, db_field, request, **kwargs):
          """
          Get a form Field for a ManyToManyField.
          """
          # If it uses an intermediary model that isn't auto created, don't show
          # a field in admin.
          if not db_field.remote_field.through._meta.auto_created:
              return None
          db = kwargs.get('using')
  
          autocomplete_fields = self.get_autocomplete_fields(request)
          if db_field.name in autocomplete_fields:
              kwargs['widget'] = AutocompleteSelectMultiple(db_field.remote_field, self.admin_site, using=db)
          elif db_field.name in self.raw_id_fields:
              kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.remote_field, self.admin_site, using=db)
          elif db_field.name in [*self.filter_vertical, *self.filter_horizontal]:
              kwargs['widget'] = widgets.FilteredSelectMultiple(
                  db_field.verbose_name,
                  db_field.name in self.filter_vertical
              )
  
          if 'queryset' not in kwargs:
              queryset = self.get_field_queryset(db, db_field, request)
              if queryset is not None:
                  kwargs['queryset'] = queryset
  
          form_field = db_field.formfield(**kwargs)
          if (isinstance(form_field.widget, SelectMultiple) and
                  not isinstance(form_field.widget, (CheckboxSelectMultiple, AutocompleteSelectMultiple))):
              msg = _('Hold down "Control", or "Command" on a Mac, to select more than one.')
              help_text = form_field.help_text
              form_field.help_text = format_lazy('{} {}', help_text, msg) if help_text else msg
          return form_field
  
      def get_autocomplete_fields(self, request):
          """
          Return a list of ForeignKey and/or ManyToMany fields which should use
          an autocomplete widget.
          """
          return self.autocomplete_fields
  
      def get_view_on_site_url(self, obj=None):
          if obj is None or not self.view_on_site:
              return None
  
          if callable(self.view_on_site):
              return self.view_on_site(obj)
          elif self.view_on_site and hasattr(obj, 'get_absolute_url'):
              # use the ContentType lookup if view_on_site is True
              return reverse('admin:view_on_site', kwargs={
                  'content_type_id': get_content_type_for_model(obj).pk,
                  'object_id': obj.pk
              })
  
      def get_empty_value_display(self):
          """
          Return the empty_value_display set on ModelAdmin or AdminSite.
          """
          try:
              return mark_safe(self.empty_value_display)
          except AttributeError:
              return mark_safe(self.admin_site.empty_value_display)
  
      def get_exclude(self, request, obj=None):
          """
          Hook for specifying exclude.
          """
          return self.exclude
  
      def get_fields(self, request, obj=None):
          """
          Hook for specifying fields.
          """
          if self.fields:
              return self.fields
          # _get_form_for_get_fields() is implemented in subclasses.
          form = self._get_form_for_get_fields(request, obj)
          return [*form.base_fields, *self.get_readonly_fields(request, obj)]
  
      def get_fieldsets(self, request, obj=None):
          """
          Hook for specifying fieldsets.
          """
          if self.fieldsets:
              return self.fieldsets
          return [(None, {'fields': self.get_fields(request, obj)})]
  
      def get_ordering(self, request):
          """
          Hook for specifying field ordering.
          """
          return self.ordering or ()  # otherwise we might try to *None, which is bad ;)
  
      def get_readonly_fields(self, request, obj=None):
          """
          Hook for specifying custom readonly fields.
          """
          return self.readonly_fields
  
      def get_prepopulated_fields(self, request, obj=None):
          """
          Hook for specifying custom prepopulated fields.
          """
          return self.prepopulated_fields
  
      def get_queryset(self, request):
          """
          Return a QuerySet of all model instances that can be edited by the
          admin site. This is used by changelist_view.
          """
          qs = self.model._default_manager.get_queryset()
          # TODO: this should be handled by some parameter to the ChangeList.
          ordering = self.get_ordering(request)
          if ordering:
              qs = qs.order_by(*ordering)
          return qs
  
      def get_sortable_by(self, request):
          """Hook for specifying which fields can be sorted in the changelist."""
          return self.sortable_by if self.sortable_by is not None else self.get_list_display(request)
  
      def lookup_allowed(self, lookup, value):
          from django.contrib.admin.filters import SimpleListFilter
  
          model = self.model
          # Check FKey lookups that are allowed, so that popups produced by
          # ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
          # are allowed to work.
          for fk_lookup in model._meta.related_fkey_lookups:
              # As ``limit_choices_to`` can be a callable, invoke it here.
              if callable(fk_lookup):
                  fk_lookup = fk_lookup()
              if (lookup, value) in widgets.url_params_from_lookup_dict(fk_lookup).items():
                  return True
  
          relation_parts = []
          prev_field = None
          for part in lookup.split(LOOKUP_SEP):
              try:
                  field = model._meta.get_field(part)
              except FieldDoesNotExist:
                  # Lookups on nonexistent fields are ok, since they're ignored
                  # later.
                  break
              # It is allowed to filter on values that would be found from local
              # model anyways. For example, if you filter on employee__department__id,
              # then the id value would be found already from employee__department_id.
              if not prev_field or (prev_field.is_relation and
                                    field not in prev_field.get_path_info()[-1].target_fields):
                  relation_parts.append(part)
              if not getattr(field, 'get_path_info', None):
                  # This is not a relational field, so further parts
                  # must be transforms.
                  break
              prev_field = field
              model = field.get_path_info()[-1].to_opts.model
  
          if len(relation_parts) <= 1:
              # Either a local field filter, or no fields at all.
              return True
          valid_lookups = {self.date_hierarchy}
          for filter_item in self.list_filter:
              if isinstance(filter_item, type) and issubclass(filter_item, SimpleListFilter):
                  valid_lookups.add(filter_item.parameter_name)
              elif isinstance(filter_item, (list, tuple)):
                  valid_lookups.add(filter_item[0])
              else:
                  valid_lookups.add(filter_item)
  
          # Is it a valid relational lookup?
          return not {
              LOOKUP_SEP.join(relation_parts),
              LOOKUP_SEP.join(relation_parts + [part])
          }.isdisjoint(valid_lookups)
  
      def to_field_allowed(self, request, to_field):
          """
          Return True if the model associated with this admin should be
          allowed to be referenced by the specified field.
          """
          opts = self.model._meta
  
          try:
              field = opts.get_field(to_field)
          except FieldDoesNotExist:
              return False
  
          # Always allow referencing the primary key since it's already possible
          # to get this information from the change view URL.
          if field.primary_key:
              return True
  
          # Allow reverse relationships to models defining m2m fields if they
          # target the specified field.
          for many_to_many in opts.many_to_many:
              if many_to_many.m2m_target_field_name() == to_field:
                  return True
  
          # Make sure at least one of the models registered for this site
          # references this field through a FK or a M2M relationship.
          registered_models = set()
          for model, admin in self.admin_site._registry.items():
              registered_models.add(model)
              for inline in admin.inlines:
                  registered_models.add(inline.model)
  
          related_objects = (
              f for f in opts.get_fields(include_hidden=True)
              if (f.auto_created and not f.concrete)
          )
          for related_object in related_objects:
              related_model = related_object.related_model
              remote_field = related_object.field.remote_field
              if (any(issubclass(model, related_model) for model in registered_models) and
                      hasattr(remote_field, 'get_related_field') and
                      remote_field.get_related_field() == field):
                  return True
  
          return False
  
      def has_add_permission(self, request):
          """
          Return True if the given request has permission to add an object.
          Can be overridden by the user in subclasses.
          """
          opts = self.opts
          codename = get_permission_codename('add', opts)
          return request.user.has_perm("%s.%s" % (opts.app_label, codename))
  
      def has_change_permission(self, request, obj=None):
          """
          Return True if the given request has permission to change the given
          Django model instance, the default implementation doesn't examine the
          `obj` parameter.
  
          Can be overridden by the user in subclasses. In such case it should
          return True if the given request has permission to change the `obj`
          model instance. If `obj` is None, this should return True if the given
          request has permission to change *any* object of the given type.
          """
          opts = self.opts
          codename = get_permission_codename('change', opts)
          return request.user.has_perm("%s.%s" % (opts.app_label, codename))
  
      def has_delete_permission(self, request, obj=None):
          """
          Return True if the given request has permission to change the given
          Django model instance, the default implementation doesn't examine the
          `obj` parameter.
  
          Can be overridden by the user in subclasses. In such case it should
          return True if the given request has permission to delete the `obj`
          model instance. If `obj` is None, this should return True if the given
          request has permission to delete *any* object of the given type.
          """
          opts = self.opts
          codename = get_permission_codename('delete', opts)
          return request.user.has_perm("%s.%s" % (opts.app_label, codename))
  
      def has_view_permission(self, request, obj=None):
          """
          Return True if the given request has permission to view the given
          Django model instance. The default implementation doesn't examine the
          `obj` parameter.
  
          If overridden by the user in subclasses, it should return True if the
          given request has permission to view the `obj` model instance. If `obj`
          is None, it should return True if the request has permission to view
          any object of the given type.
          """
          opts = self.opts
          codename_view = get_permission_codename('view', opts)
          codename_change = get_permission_codename('change', opts)
          return (
              request.user.has_perm('%s.%s' % (opts.app_label, codename_view)) or
              request.user.has_perm('%s.%s' % (opts.app_label, codename_change))
          )
  
      def has_view_or_change_permission(self, request, obj=None):
          return self.has_view_permission(request, obj) or self.has_change_permission(request, obj)
  
      def has_module_permission(self, request):
          """
          Return True if the given request has any permission in the given
          app label.
  
          Can be overridden by the user in subclasses. In such case it should
          return True if the given request has permission to view the module on
          the admin index page and access the module's index page. Overriding it
          does not restrict access to the add, change or delete views. Use
          `ModelAdmin.has_(add|change|delete)_permission` for that.
          """
          return request.user.has_module_perms(self.opts.app_label)
  
  
  class ModelAdmin(BaseModelAdmin):
      """Encapsulate all admin options and functionality for a given model."""
  
      list_display = ('__str__',)
      list_display_links = ()
      list_filter = ()
      list_select_related = False
      list_per_page = 100
      list_max_show_all = 200
      list_editable = ()
      search_fields = ()
      date_hierarchy = None
      save_as = False
      save_as_continue = True
      save_on_top = False
      paginator = Paginator
      preserve_filters = True
      inlines = []
  
      # Custom templates (designed to be over-ridden in subclasses)
      add_form_template = None
      change_form_template = None
      change_list_template = None
      delete_confirmation_template = None
      delete_selected_confirmation_template = None
      object_history_template = None
      popup_response_template = None
  
      # Actions
      actions = []
      action_form = helpers.ActionForm
      actions_on_top = True
      actions_on_bottom = False
      actions_selection_counter = True
      checks_class = ModelAdminChecks
  
      def __init__(self, model, admin_site):
          self.model = model
          self.opts = model._meta
          self.admin_site = admin_site
          super().__init__()
  
      def __str__(self):
          return "%s.%s" % (self.model._meta.app_label, self.__class__.__name__)
  
      def get_inline_instances(self, request, obj=None):
          inline_instances = []
          for inline_class in self.inlines:
              inline = inline_class(self.model, self.admin_site)
              if request:
                  inline_has_add_permission = inline._has_add_permission(request, obj)
                  if not (inline.has_view_or_change_permission(request, obj) or
                          inline_has_add_permission or
                          inline.has_delete_permission(request, obj)):
                      continue
                  if not inline_has_add_permission:
                      inline.max_num = 0
              inline_instances.append(inline)
  
          return inline_instances
  
      def get_urls(self):
          from django.urls import path
  
          def wrap(view):
              def wrapper(*args, **kwargs):
                  return self.admin_site.admin_view(view)(*args, **kwargs)
              wrapper.model_admin = self
              return update_wrapper(wrapper, view)
  
          info = self.model._meta.app_label, self.model._meta.model_name
  
          urlpatterns = [
              path('', wrap(self.changelist_view), name='%s_%s_changelist' % info),
              path('add/', wrap(self.add_view), name='%s_%s_add' % info),
              path('autocomplete/', wrap(self.autocomplete_view), name='%s_%s_autocomplete' % info),
              path('<path:object_id>/history/', wrap(self.history_view), name='%s_%s_history' % info),
              path('<path:object_id>/delete/', wrap(self.delete_view), name='%s_%s_delete' % info),
              path('<path:object_id>/change/', wrap(self.change_view), name='%s_%s_change' % info),
              # For backwards compatibility (was the change url before 1.9)
              path('<path:object_id>/', wrap(RedirectView.as_view(
                  pattern_name='%s:%s_%s_change' % ((self.admin_site.name,) + info)
              ))),
          ]
          return urlpatterns
  
      @property
      def urls(self):
          return self.get_urls()
  
      @property
      def media(self):
          extra = '' if settings.DEBUG else '.min'
          js = [
              'vendor/jquery/jquery%s.js' % extra,
              'jquery.init.js',
              'core.js',
              'admin/RelatedObjectLookups.js',
              'actions%s.js' % extra,
              'urlify.js',
              'prepopulate%s.js' % extra,
              'vendor/xregexp/xregexp%s.js' % extra,
          ]
          return forms.Media(js=['admin/js/%s' % url for url in js])
  
      def get_model_perms(self, request):
          """
          Return a dict of all perms for this model. This dict has the keys
          ``add``, ``change``, ``delete``, and ``view`` mapping to the True/False
          for each of those actions.
          """
          return {
              'add': self.has_add_permission(request),
              'change': self.has_change_permission(request),
              'delete': self.has_delete_permission(request),
              'view': self.has_view_permission(request),
          }
  
      def _get_form_for_get_fields(self, request, obj):
          return self.get_form(request, obj, fields=None)
  
      def get_form(self, request, obj=None, change=False, **kwargs):
          """
          Return a Form class for use in the admin add view. This is used by
          add_view and change_view.
          """
          if 'fields' in kwargs:
              fields = kwargs.pop('fields')
          else:
              fields = flatten_fieldsets(self.get_fieldsets(request, obj))
          excluded = self.get_exclude(request, obj)
          exclude = [] if excluded is None else list(excluded)
          readonly_fields = self.get_readonly_fields(request, obj)
          exclude.extend(readonly_fields)
          # Exclude all fields if it's a change form and the user doesn't have
          # the change permission.
          if change and hasattr(request, 'user') and not self.has_change_permission(request, obj):
              exclude.extend(fields)
          if excluded is None and hasattr(self.form, '_meta') and self.form._meta.exclude:
              # Take the custom ModelForm's Meta.exclude into account only if the
              # ModelAdmin doesn't define its own.
              exclude.extend(self.form._meta.exclude)
          # if exclude is an empty list we pass None to be consistent with the
          # default on modelform_factory
          exclude = exclude or None
  
          # Remove declared form fields which are in readonly_fields.
          new_attrs = OrderedDict.fromkeys(
              f for f in readonly_fields
              if f in self.form.declared_fields
          )
          form = type(self.form.__name__, (self.form,), new_attrs)
  
          defaults = {
              'form': form,
              'fields': fields,
              'exclude': exclude,
              'formfield_callback': partial(self.formfield_for_dbfield, request=request),
              **kwargs,
          }
  
          if defaults['fields'] is None and not modelform_defines_fields(defaults['form']):
              defaults['fields'] = forms.ALL_FIELDS
  
          try:
              return modelform_factory(self.model, **defaults)
          except FieldError as e:
              raise FieldError(
                  '%s. Check fields/fieldsets/exclude attributes of class %s.'
                  % (e, self.__class__.__name__)
              )
  
      def get_changelist(self, request, **kwargs):
          """
          Return the ChangeList class for use on the changelist page.
          """
          from django.contrib.admin.views.main import ChangeList
          return ChangeList
  
      def get_changelist_instance(self, request):
          """
          Return a `ChangeList` instance based on `request`. May raise
          `IncorrectLookupParameters`.
          """
          list_display = self.get_list_display(request)
          list_display_links = self.get_list_display_links(request, list_display)
          # Add the action checkboxes if any actions are available.
          if self.get_actions(request):
              list_display = ['action_checkbox', *list_display]
          sortable_by = self.get_sortable_by(request)
          ChangeList = self.get_changelist(request)
          return ChangeList(
              request,
              self.model,
              list_display,
              list_display_links,
              self.get_list_filter(request),
              self.date_hierarchy,
              self.get_search_fields(request),
              self.get_list_select_related(request),
              self.list_per_page,
              self.list_max_show_all,
              self.list_editable,
              self,
              sortable_by,
          )
  
      def get_object(self, request, object_id, from_field=None):
          """
          Return an instance matching the field and value provided, the primary
          key is used if no field is provided. Return ``None`` if no match is
          found or the object_id fails validation.
          """
          queryset = self.get_queryset(request)
          model = queryset.model
          field = model._meta.pk if from_field is None else model._meta.get_field(from_field)
          try:
              object_id = field.to_python(object_id)
              return queryset.get(**{field.name: object_id})
          except (model.DoesNotExist, ValidationError, ValueError):
              return None
  
      def get_changelist_form(self, request, **kwargs):
          """
          Return a Form class for use in the Formset on the changelist page.
          """
          defaults = {
              'formfield_callback': partial(self.formfield_for_dbfield, request=request),
              **kwargs,
          }
          if defaults.get('fields') is None and not modelform_defines_fields(defaults.get('form')):
              defaults['fields'] = forms.ALL_FIELDS
  
          return modelform_factory(self.model, **defaults)
  
      def get_changelist_formset(self, request, **kwargs):
          """
          Return a FormSet class for use on the changelist page if list_editable
          is used.
          """
          defaults = {
              'formfield_callback': partial(self.formfield_for_dbfield, request=request),
              **kwargs,
          }
          return modelformset_factory(
              self.model, self.get_changelist_form(request), extra=0,
              fields=self.list_editable, **defaults
          )
  
      def get_formsets_with_inlines(self, request, obj=None):
          """
          Yield formsets and the corresponding inlines.
          """
          for inline in self.get_inline_instances(request, obj):
              yield inline.get_formset(request, obj), inline
  
      def get_paginator(self, request, queryset, per_page, orphans=0, allow_empty_first_page=True):
          return self.paginator(queryset, per_page, orphans, allow_empty_first_page)
  
      def log_addition(self, request, object, message):
          """
          Log that an object has been successfully added.
  
          The default implementation creates an admin LogEntry object.
          """
          from django.contrib.admin.models import LogEntry, ADDITION
          return LogEntry.objects.log_action(
              user_id=request.user.pk,
              content_type_id=get_content_type_for_model(object).pk,
              object_id=object.pk,
              object_repr=str(object),
              action_flag=ADDITION,
              change_message=message,
          )
  
      def log_change(self, request, object, message):
          """
          Log that an object has been successfully changed.
  
          The default implementation creates an admin LogEntry object.
          """
          from django.contrib.admin.models import LogEntry, CHANGE
          return LogEntry.objects.log_action(
              user_id=request.user.pk,
              content_type_id=get_content_type_for_model(object).pk,
              object_id=object.pk,
              object_repr=str(object),
              action_flag=CHANGE,
              change_message=message,
          )
  
      def log_deletion(self, request, object, object_repr):
          """
          Log that an object will be deleted. Note that this method must be
          called before the deletion.
  
          The default implementation creates an admin LogEntry object.
          """
          from django.contrib.admin.models import LogEntry, DELETION
          return LogEntry.objects.log_action(
              user_id=request.user.pk,
              content_type_id=get_content_type_for_model(object).pk,
              object_id=object.pk,
              object_repr=object_repr,
              action_flag=DELETION,
          )
  
      def action_checkbox(self, obj):
          """
          A list_display column containing a checkbox widget.
          """
          return helpers.checkbox.render(helpers.ACTION_CHECKBOX_NAME, str(obj.pk))
      action_checkbox.short_description = mark_safe('<input type="checkbox" id="action-toggle">')
  
      def _get_base_actions(self):
          """Return the list of actions, prior to any request-based filtering."""
          actions = []
  
          # Gather actions from the admin site first
          for (name, func) in self.admin_site.actions:
              description = getattr(func, 'short_description', name.replace('_', ' '))
              actions.append((func, name, description))
          # Add actions from this ModelAdmin.
          actions.extend(self.get_action(action) for action in self.actions or [])
          # get_action might have returned None, so filter any of those out.
          return filter(None, actions)
  
      def _filter_actions_by_permissions(self, request, actions):
          """Filter out any actions that the user doesn't have access to."""
          filtered_actions = []
          for action in actions:
              callable = action[0]
              if not hasattr(callable, 'allowed_permissions'):
                  filtered_actions.append(action)
                  continue
              permission_checks = (
                  getattr(self, 'has_%s_permission' % permission)
                  for permission in callable.allowed_permissions
              )
              if any(has_permission(request) for has_permission in permission_checks):
                  filtered_actions.append(action)
          return filtered_actions
  
      def get_actions(self, request):
          """
          Return a dictionary mapping the names of all actions for this
          ModelAdmin to a tuple of (callable, name, description) for each action.
          """
          # If self.actions is set to None that means actions are disabled on
          # this page.
          if self.actions is None or IS_POPUP_VAR in request.GET:
              return OrderedDict()
          actions = self._filter_actions_by_permissions(request, self._get_base_actions())
          # Convert the actions into an OrderedDict keyed by name.
          return OrderedDict(
              (name, (func, name, desc))
              for func, name, desc in actions
          )
  
      def get_action_choices(self, request, default_choices=BLANK_CHOICE_DASH):
          """
          Return a list of choices for use in a form object.  Each choice is a
          tuple (name, description).
          """
          choices = [] + default_choices
          for func, name, description in self.get_actions(request).values():
              choice = (name, description % model_format_dict(self.opts))
              choices.append(choice)
          return choices
  
      def get_action(self, action):
          """
          Return a given action from a parameter, which can either be a callable,
          or the name of a method on the ModelAdmin.  Return is a tuple of
          (callable, name, description).
          """
          # If the action is a callable, just use it.
          if callable(action):
              func = action
              action = action.__name__
  
          # Next, look for a method. Grab it off self.__class__ to get an unbound
          # method instead of a bound one; this ensures that the calling
          # conventions are the same for functions and methods.
          elif hasattr(self.__class__, action):
              func = getattr(self.__class__, action)
  
          # Finally, look for a named method on the admin site
          else:
              try:
                  func = self.admin_site.get_action(action)
              except KeyError:
                  return None
  
          if hasattr(func, 'short_description'):
              description = func.short_description
          else:
              description = capfirst(action.replace('_', ' '))
          return func, action, description
  
      def get_list_display(self, request):
          """
          Return a sequence containing the fields to be displayed on the
          changelist.
          """
          return self.list_display
  
      def get_list_display_links(self, request, list_display):
          """
          Return a sequence containing the fields to be displayed as links
          on the changelist. The list_display parameter is the list of fields
          returned by get_list_display().
          """
          if self.list_display_links or self.list_display_links is None or not list_display:
              return self.list_display_links
          else:
              # Use only the first item in list_display as link
              return list(list_display)[:1]
  
      def get_list_filter(self, request):
          """
          Return a sequence containing the fields to be displayed as filters in
          the right sidebar of the changelist page.
          """
          return self.list_filter
  
      def get_list_select_related(self, request):
          """
          Return a list of fields to add to the select_related() part of the
          changelist items query.
          """
          return self.list_select_related
  
      def get_search_fields(self, request):
          """
          Return a sequence containing the fields to be searched whenever
          somebody submits a search query.
          """
          return self.search_fields
  
      def get_search_results(self, request, queryset, search_term):
          """
          Return a tuple containing a queryset to implement the search
          and a boolean indicating if the results may contain duplicates.
          """
          # Apply keyword searches.
          def construct_search(field_name):
              if field_name.startswith('^'):
                  return "%s__istartswith" % field_name[1:]
              elif field_name.startswith('='):
                  return "%s__iexact" % field_name[1:]
              elif field_name.startswith('@'):
                  return "%s__search" % field_name[1:]
              # Use field_name if it includes a lookup.
              opts = queryset.model._meta
              lookup_fields = field_name.split(LOOKUP_SEP)
              # Go through the fields, following all relations.
              prev_field = None
              for path_part in lookup_fields:
                  if path_part == 'pk':
                      path_part = opts.pk.name
                  try:
                      field = opts.get_field(path_part)
                  except FieldDoesNotExist:
                      # Use valid query lookups.
                      if prev_field and prev_field.get_lookup(path_part):
                          return field_name
                  else:
                      prev_field = field
                      if hasattr(field, 'get_path_info'):
                          # Update opts to follow the relation.
                          opts = field.get_path_info()[-1].to_opts
              # Otherwise, use the field with icontains.
              return "%s__icontains" % field_name
  
          use_distinct = False
          search_fields = self.get_search_fields(request)
          if search_fields and search_term:
              orm_lookups = [construct_search(str(search_field))
                             for search_field in search_fields]
              for bit in search_term.split():
                  or_queries = [models.Q(**{orm_lookup: bit})
                                for orm_lookup in orm_lookups]
                  queryset = queryset.filter(reduce(operator.or_, or_queries))
              use_distinct |= any(lookup_needs_distinct(self.opts, search_spec) for search_spec in orm_lookups)
  
          return queryset, use_distinct
  
      def get_preserved_filters(self, request):
          """
          Return the preserved filters querystring.
          """
          match = request.resolver_match
          if self.preserve_filters and match:
              opts = self.model._meta
              current_url = '%s:%s' % (match.app_name, match.url_name)
              changelist_url = 'admin:%s_%s_changelist' % (opts.app_label, opts.model_name)
              if current_url == changelist_url:
                  preserved_filters = request.GET.urlencode()
              else:
                  preserved_filters = request.GET.get('_changelist_filters')
  
              if preserved_filters:
                  return urlencode({'_changelist_filters': preserved_filters})
          return ''
  
      def construct_change_message(self, request, form, formsets, add=False):
          """
          Construct a JSON structure describing changes from a changed object.
          """
          return construct_change_message(form, formsets, add)
  
      def message_user(self, request, message, level=messages.INFO, extra_tags='',
                       fail_silently=False):
          """
          Send a message to the user. The default implementation
          posts a message using the django.contrib.messages backend.
  
          Exposes almost the same API as messages.add_message(), but accepts the
          positional arguments in a different order to maintain backwards
          compatibility. For convenience, it accepts the `level` argument as
          a string rather than the usual level number.
          """
          if not isinstance(level, int):
              # attempt to get the level if passed a string
              try:
                  level = getattr(messages.constants, level.upper())
              except AttributeError:
                  levels = messages.constants.DEFAULT_TAGS.values()
                  levels_repr = ', '.join('`%s`' % l for l in levels)
                  raise ValueError(
                      'Bad message level string: `%s`. Possible values are: %s'
                      % (level, levels_repr)
                  )
  
          messages.add_message(request, level, message, extra_tags=extra_tags, fail_silently=fail_silently)
  
      def save_form(self, request, form, change):
          """
          Given a ModelForm return an unsaved instance. ``change`` is True if
          the object is being changed, and False if it's being added.
          """
          return form.save(commit=False)
  
      def save_model(self, request, obj, form, change):
          """
          Given a model instance save it to the database.
          """
          obj.save()
  
      def delete_model(self, request, obj):
          """
          Given a model instance delete it from the database.
          """
          obj.delete()
  
      def delete_queryset(self, request, queryset):
          """Given a queryset, delete it from the database."""
          queryset.delete()
  
      def save_formset(self, request, form, formset, change):
          """
          Given an inline formset save it to the database.
          """
          formset.save()
  
      def save_related(self, request, form, formsets, change):
          """
          Given the ``HttpRequest``, the parent ``ModelForm`` instance, the
          list of inline formsets and a boolean value based on whether the
          parent is being added or changed, save the related objects to the
          database. Note that at this point save_form() and save_model() have
          already been called.
          """
          form.save_m2m()
          for formset in formsets:
              self.save_formset(request, form, formset, change=change)
  
      def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
          opts = self.model._meta
          app_label = opts.app_label
          preserved_filters = self.get_preserved_filters(request)
          form_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, form_url)
          view_on_site_url = self.get_view_on_site_url(obj)
          has_editable_inline_admin_formsets = False
          for inline in context['inline_admin_formsets']:
              if inline.has_add_permission or inline.has_change_permission or inline.has_delete_permission:
                  has_editable_inline_admin_formsets = True
                  break
          context.update({
              'add': add,
              'change': change,
              'has_view_permission': self.has_view_permission(request, obj),
              'has_add_permission': self.has_add_permission(request),
              'has_change_permission': self.has_change_permission(request, obj),
              'has_delete_permission': self.has_delete_permission(request, obj),
              'has_editable_inline_admin_formsets': has_editable_inline_admin_formsets,
              'has_file_field': context['adminform'].form.is_multipart() or any(
                  admin_formset.formset.form().is_multipart()
                  for admin_formset in context['inline_admin_formsets']
              ),
              'has_absolute_url': view_on_site_url is not None,
              'absolute_url': view_on_site_url,
              'form_url': form_url,
              'opts': opts,
              'content_type_id': get_content_type_for_model(self.model).pk,
              'save_as': self.save_as,
              'save_on_top': self.save_on_top,
              'to_field_var': TO_FIELD_VAR,
              'is_popup_var': IS_POPUP_VAR,
              'app_label': app_label,
          })
          if add and self.add_form_template is not None:
              form_template = self.add_form_template
          else:
              form_template = self.change_form_template
  
          request.current_app = self.admin_site.name
  
          return TemplateResponse(request, form_template or [
              "admin/%s/%s/change_form.html" % (app_label, opts.model_name),
              "admin/%s/change_form.html" % app_label,
              "admin/change_form.html"
          ], context)
  
      def response_add(self, request, obj, post_url_continue=None):
          """
          Determine the HttpResponse for the add_view stage.
          """
          opts = obj._meta
          preserved_filters = self.get_preserved_filters(request)
          obj_url = reverse(
              'admin:%s_%s_change' % (opts.app_label, opts.model_name),
              args=(quote(obj.pk),),
              current_app=self.admin_site.name,
          )
          # Add a link to the object's change form if the user can edit the obj.
          if self.has_change_permission(request, obj):
              obj_repr = format_html('<a href="{}">{}</a>', urlquote(obj_url), obj)
          else:
              obj_repr = str(obj)
          msg_dict = {
              'name': opts.verbose_name,
              'obj': obj_repr,
          }
          # Here, we distinguish between different save types by checking for
          # the presence of keys in request.POST.
  
          if IS_POPUP_VAR in request.POST:
              to_field = request.POST.get(TO_FIELD_VAR)
              if to_field:
                  attr = str(to_field)
              else:
                  attr = obj._meta.pk.attname
              value = obj.serializable_value(attr)
              popup_response_data = json.dumps({
                  'value': str(value),
                  'obj': str(obj),
              })
              return TemplateResponse(request, self.popup_response_template or [
                  'admin/%s/%s/popup_response.html' % (opts.app_label, opts.model_name),
                  'admin/%s/popup_response.html' % opts.app_label,
                  'admin/popup_response.html',
              ], {
                  'popup_response_data': popup_response_data,
              })
  
          elif "_continue" in request.POST or (
                  # Redirecting after "Save as new".
                  "_saveasnew" in request.POST and self.save_as_continue and
                  self.has_change_permission(request, obj)
          ):
              msg = _('The {name} "{obj}" was added successfully.')
              if self.has_change_permission(request, obj):
                  msg += ' ' + _('You may edit it again below.')
              self.message_user(request, format_html(msg, **msg_dict), messages.SUCCESS)
              if post_url_continue is None:
                  post_url_continue = obj_url
              post_url_continue = add_preserved_filters(
                  {'preserved_filters': preserved_filters, 'opts': opts},
                  post_url_continue
              )
              return HttpResponseRedirect(post_url_continue)
  
          elif "_addanother" in request.POST:
              msg = format_html(
                  _('The {name} "{obj}" was added successfully. You may add another {name} below.'),
                  **msg_dict
              )
              self.message_user(request, msg, messages.SUCCESS)
              redirect_url = request.path
              redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
              return HttpResponseRedirect(redirect_url)
  
          else:
              msg = format_html(
                  _('The {name} "{obj}" was added successfully.'),
                  **msg_dict
              )
              self.message_user(request, msg, messages.SUCCESS)
              return self.response_post_save_add(request, obj)
  
      def response_change(self, request, obj):
          """
          Determine the HttpResponse for the change_view stage.
          """
  
          if IS_POPUP_VAR in request.POST:
              opts = obj._meta
              to_field = request.POST.get(TO_FIELD_VAR)
              attr = str(to_field) if to_field else opts.pk.attname
              value = request.resolver_match.kwargs['object_id']
              new_value = obj.serializable_value(attr)
              popup_response_data = json.dumps({
                  'action': 'change',
                  'value': str(value),
                  'obj': str(obj),
                  'new_value': str(new_value),
              })
              return TemplateResponse(request, self.popup_response_template or [
                  'admin/%s/%s/popup_response.html' % (opts.app_label, opts.model_name),
                  'admin/%s/popup_response.html' % opts.app_label,
                  'admin/popup_response.html',
              ], {
                  'popup_response_data': popup_response_data,
              })
  
          opts = self.model._meta
          preserved_filters = self.get_preserved_filters(request)
  
          msg_dict = {
              'name': opts.verbose_name,
              'obj': format_html('<a href="{}">{}</a>', urlquote(request.path), obj),
          }
          if "_continue" in request.POST:
              msg = format_html(
                  _('The {name} "{obj}" was changed successfully. You may edit it again below.'),
                  **msg_dict
              )
              self.message_user(request, msg, messages.SUCCESS)
              redirect_url = request.path
              redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
              return HttpResponseRedirect(redirect_url)
  
          elif "_saveasnew" in request.POST:
              msg = format_html(
                  _('The {name} "{obj}" was added successfully. You may edit it again below.'),
                  **msg_dict
              )
              self.message_user(request, msg, messages.SUCCESS)
              redirect_url = reverse('admin:%s_%s_change' %
                                     (opts.app_label, opts.model_name),
                                     args=(obj.pk,),
                                     current_app=self.admin_site.name)
              redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
              return HttpResponseRedirect(redirect_url)
  
          elif "_addanother" in request.POST:
              msg = format_html(
                  _('The {name} "{obj}" was changed successfully. You may add another {name} below.'),
                  **msg_dict
              )
              self.message_user(request, msg, messages.SUCCESS)
              redirect_url = reverse('admin:%s_%s_add' %
                                     (opts.app_label, opts.model_name),
                                     current_app=self.admin_site.name)
              redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
              return HttpResponseRedirect(redirect_url)
  
          else:
              msg = format_html(
                  _('The {name} "{obj}" was changed successfully.'),
                  **msg_dict
              )
              self.message_user(request, msg, messages.SUCCESS)
              return self.response_post_save_change(request, obj)
  
      def _response_post_save(self, request, obj):
          opts = self.model._meta
          if self.has_view_or_change_permission(request):
              post_url = reverse('admin:%s_%s_changelist' %
                                 (opts.app_label, opts.model_name),
                                 current_app=self.admin_site.name)
              preserved_filters = self.get_preserved_filters(request)
              post_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, post_url)
          else:
              post_url = reverse('admin:index',
                                 current_app=self.admin_site.name)
          return HttpResponseRedirect(post_url)
  
      def response_post_save_add(self, request, obj):
          """
          Figure out where to redirect after the 'Save' button has been pressed
          when adding a new object.
          """
          return self._response_post_save(request, obj)
  
      def response_post_save_change(self, request, obj):
          """
          Figure out where to redirect after the 'Save' button has been pressed
          when editing an existing object.
          """
          return self._response_post_save(request, obj)
  
      def response_action(self, request, queryset):
          """
          Handle an admin action. This is called if a request is POSTed to the
          changelist; it returns an HttpResponse if the action was handled, and
          None otherwise.
          """
  
          # There can be multiple action forms on the page (at the top
          # and bottom of the change list, for example). Get the action
          # whose button was pushed.
          try:
              action_index = int(request.POST.get('index', 0))
          except ValueError:
              action_index = 0
  
          # Construct the action form.
          data = request.POST.copy()
          data.pop(helpers.ACTION_CHECKBOX_NAME, None)
          data.pop("index", None)
  
          # Use the action whose button was pushed
          try:
              data.update({'action': data.getlist('action')[action_index]})
          except IndexError:
              # If we didn't get an action from the chosen form that's invalid
              # POST data, so by deleting action it'll fail the validation check
              # below. So no need to do anything here
              pass
  
          action_form = self.action_form(data, auto_id=None)
          action_form.fields['action'].choices = self.get_action_choices(request)
  
          # If the form's valid we can handle the action.
          if action_form.is_valid():
              action = action_form.cleaned_data['action']
              select_across = action_form.cleaned_data['select_across']
              func = self.get_actions(request)[action][0]
  
              # Get the list of selected PKs. If nothing's selected, we can't
              # perform an action on it, so bail. Except we want to perform
              # the action explicitly on all objects.
              selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)
              if not selected and not select_across:
                  # Reminder that something needs to be selected or nothing will happen
                  msg = _("Items must be selected in order to perform "
                          "actions on them. No items have been changed.")
                  self.message_user(request, msg, messages.WARNING)
                  return None
  
              if not select_across:
                  # Perform the action only on the selected objects
                  queryset = queryset.filter(pk__in=selected)
  
              response = func(self, request, queryset)
  
              # Actions may return an HttpResponse-like object, which will be
              # used as the response from the POST. If not, we'll be a good
              # little HTTP citizen and redirect back to the changelist page.
              if isinstance(response, HttpResponseBase):
                  return response
              else:
                  return HttpResponseRedirect(request.get_full_path())
          else:
              msg = _("No action selected.")
              self.message_user(request, msg, messages.WARNING)
              return None
  
      def response_delete(self, request, obj_display, obj_id):
          """
          Determine the HttpResponse for the delete_view stage.
          """
          opts = self.model._meta
  
          if IS_POPUP_VAR in request.POST:
              popup_response_data = json.dumps({
                  'action': 'delete',
                  'value': str(obj_id),
              })
              return TemplateResponse(request, self.popup_response_template or [
                  'admin/%s/%s/popup_response.html' % (opts.app_label, opts.model_name),
                  'admin/%s/popup_response.html' % opts.app_label,
                  'admin/popup_response.html',
              ], {
                  'popup_response_data': popup_response_data,
              })
  
          self.message_user(
              request,
              _('The %(name)s "%(obj)s" was deleted successfully.') % {
                  'name': opts.verbose_name,
                  'obj': obj_display,
              },
              messages.SUCCESS,
          )
  
          if self.has_change_permission(request, None):
              post_url = reverse(
                  'admin:%s_%s_changelist' % (opts.app_label, opts.model_name),
                  current_app=self.admin_site.name,
              )
              preserved_filters = self.get_preserved_filters(request)
              post_url = add_preserved_filters(
                  {'preserved_filters': preserved_filters, 'opts': opts}, post_url
              )
          else:
              post_url = reverse('admin:index', current_app=self.admin_site.name)
          return HttpResponseRedirect(post_url)
  
      def render_delete_form(self, request, context):
          opts = self.model._meta
          app_label = opts.app_label
  
          request.current_app = self.admin_site.name
          context.update(
              to_field_var=TO_FIELD_VAR,
              is_popup_var=IS_POPUP_VAR,
              media=self.media,
          )
  
          return TemplateResponse(
              request,
              self.delete_confirmation_template or [
                  "admin/{}/{}/delete_confirmation.html".format(app_label, opts.model_name),
                  "admin/{}/delete_confirmation.html".format(app_label),
                  "admin/delete_confirmation.html",
              ],
              context,
          )
  
      def get_inline_formsets(self, request, formsets, inline_instances, obj=None):
          # Edit permissions on parent model are required for editable inlines.
          can_edit_parent = self.has_change_permission(request, obj) if obj else self.has_add_permission(request)
          inline_admin_formsets = []
          for inline, formset in zip(inline_instances, formsets):
              fieldsets = list(inline.get_fieldsets(request, obj))
              readonly = list(inline.get_readonly_fields(request, obj))
              if can_edit_parent:
                  has_add_permission = inline._has_add_permission(request, obj)
                  has_change_permission = inline.has_change_permission(request, obj)
                  has_delete_permission = inline.has_delete_permission(request, obj)
              else:
                  # Disable all edit-permissions, and overide formset settings.
                  has_add_permission = has_change_permission = has_delete_permission = False
                  formset.extra = formset.max_num = 0
              has_view_permission = inline.has_view_permission(request, obj)
              prepopulated = dict(inline.get_prepopulated_fields(request, obj))
              inline_admin_formset = helpers.InlineAdminFormSet(
                  inline, formset, fieldsets, prepopulated, readonly, model_admin=self,
                  has_add_permission=has_add_permission, has_change_permission=has_change_permission,
                  has_delete_permission=has_delete_permission, has_view_permission=has_view_permission,
              )
              inline_admin_formsets.append(inline_admin_formset)
          return inline_admin_formsets
  
      def get_changeform_initial_data(self, request):
          """
          Get the initial form data from the request's GET params.
          """
          initial = dict(request.GET.items())
          for k in initial:
              try:
                  f = self.model._meta.get_field(k)
              except FieldDoesNotExist:
                  continue
              # We have to special-case M2Ms as a list of comma-separated PKs.
              if isinstance(f, models.ManyToManyField):
                  initial[k] = initial[k].split(",")
          return initial
  
      def _get_obj_does_not_exist_redirect(self, request, opts, object_id):
          """
          Create a message informing the user that the object doesn't exist
          and return a redirect to the admin index page.
          """
          msg = _("""%(name)s with ID "%(key)s" doesn't exist. Perhaps it was deleted?""") % {
              'name': opts.verbose_name,
              'key': unquote(object_id),
          }
          self.message_user(request, msg, messages.WARNING)
          url = reverse('admin:index', current_app=self.admin_site.name)
          return HttpResponseRedirect(url)
  
      @csrf_protect_m
      def changeform_view(self, request, object_id=None, form_url='', extra_context=None):
          with transaction.atomic(using=router.db_for_write(self.model)):
              return self._changeform_view(request, object_id, form_url, extra_context)
  
      def _changeform_view(self, request, object_id, form_url, extra_context):
          to_field = request.POST.get(TO_FIELD_VAR, request.GET.get(TO_FIELD_VAR))
          if to_field and not self.to_field_allowed(request, to_field):
              raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)
  
          model = self.model
          opts = model._meta
  
          if request.method == 'POST' and '_saveasnew' in request.POST:
              object_id = None
  
          add = object_id is None
  
          if add:
              if not self.has_add_permission(request):
                  raise PermissionDenied
              obj = None
  
          else:
              obj = self.get_object(request, unquote(object_id), to_field)
  
              if request.method == 'POST':
                  if not self.has_change_permission(request, obj):
                      raise PermissionDenied
              else:
                  if not self.has_view_or_change_permission(request, obj):
                      raise PermissionDenied
  
              if obj is None:
                  return self._get_obj_does_not_exist_redirect(request, opts, object_id)
  
          ModelForm = self.get_form(request, obj, change=not add)
          if request.method == 'POST':
              form = ModelForm(request.POST, request.FILES, instance=obj)
              form_validated = form.is_valid()
              if form_validated:
                  new_object = self.save_form(request, form, change=not add)
              else:
                  new_object = form.instance
              formsets, inline_instances = self._create_formsets(request, new_object, change=not add)
              if all_valid(formsets) and form_validated:
                  self.save_model(request, new_object, form, not add)
                  self.save_related(request, form, formsets, not add)
                  change_message = self.construct_change_message(request, form, formsets, add)
                  if add:
                      self.log_addition(request, new_object, change_message)
                      return self.response_add(request, new_object)
                  else:
                      self.log_change(request, new_object, change_message)
                      return self.response_change(request, new_object)
              else:
                  form_validated = False
          else:
              if add:
                  initial = self.get_changeform_initial_data(request)
                  form = ModelForm(initial=initial)
                  formsets, inline_instances = self._create_formsets(request, form.instance, change=False)
              else:
                  form = ModelForm(instance=obj)
                  formsets, inline_instances = self._create_formsets(request, obj, change=True)
  
          if not add and not self.has_change_permission(request, obj):
              readonly_fields = flatten_fieldsets(self.get_fieldsets(request, obj))
          else:
              readonly_fields = self.get_readonly_fields(request, obj)
          adminForm = helpers.AdminForm(
              form,
              list(self.get_fieldsets(request, obj)),
              # Clear prepopulated fields on a view-only form to avoid a crash.
              self.get_prepopulated_fields(request, obj) if add or self.has_change_permission(request, obj) else {},
              readonly_fields,
              model_admin=self)
          media = self.media + adminForm.media
  
          inline_formsets = self.get_inline_formsets(request, formsets, inline_instances, obj)
          for inline_formset in inline_formsets:
              media = media + inline_formset.media
  
          if add:
              title = _('Add %s')
          elif self.has_change_permission(request, obj):
              title = _('Change %s')
          else:
              title = _('View %s')
          context = {
              **self.admin_site.each_context(request),
              'title': title % opts.verbose_name,
              'adminform': adminForm,
              'object_id': object_id,
              'original': obj,
              'is_popup': IS_POPUP_VAR in request.POST or IS_POPUP_VAR in request.GET,
              'to_field': to_field,
              'media': media,
              'inline_admin_formsets': inline_formsets,
              'errors': helpers.AdminErrorList(form, formsets),
              'preserved_filters': self.get_preserved_filters(request),
          }
  
          # Hide the "Save" and "Save and continue" buttons if "Save as New" was
          # previously chosen to prevent the interface from getting confusing.
          if request.method == 'POST' and not form_validated and "_saveasnew" in request.POST:
              context['show_save'] = False
              context['show_save_and_continue'] = False
              # Use the change template instead of the add template.
              add = False
  
          context.update(extra_context or {})
  
          return self.render_change_form(request, context, add=add, change=not add, obj=obj, form_url=form_url)
  
      def autocomplete_view(self, request):
          return AutocompleteJsonView.as_view(model_admin=self)(request)
  
      def add_view(self, request, form_url='', extra_context=None):
          return self.changeform_view(request, None, form_url, extra_context)
  
      def change_view(self, request, object_id, form_url='', extra_context=None):
          return self.changeform_view(request, object_id, form_url, extra_context)
  
      def _get_edited_object_pks(self, request, prefix):
          """Return POST data values of list_editable primary keys."""
          pk_pattern = re.compile(
              r'{}-\d+-{}$'.format(re.escape(prefix), self.model._meta.pk.name)
          )
          return [value for key, value in request.POST.items() if pk_pattern.match(key)]
  
      def _get_list_editable_queryset(self, request, prefix):
          """
          Based on POST data, return a queryset of the objects that were edited
          via list_editable.
          """
          object_pks = self._get_edited_object_pks(request, prefix)
          queryset = self.get_queryset(request)
          validate = queryset.model._meta.pk.to_python
          try:
              for pk in object_pks:
                  validate(pk)
          except ValidationError:
              # Disable the optimization if the POST data was tampered with.
              return queryset
          return queryset.filter(pk__in=object_pks)
  
      @csrf_protect_m
      def changelist_view(self, request, extra_context=None):
          """
          The 'change list' admin view for this model.
          """
          from django.contrib.admin.views.main import ERROR_FLAG
          opts = self.model._meta
          app_label = opts.app_label
          if not self.has_view_or_change_permission(request):
              raise PermissionDenied
  
          try:
              cl = self.get_changelist_instance(request)
          except IncorrectLookupParameters:
              # Wacky lookup parameters were given, so redirect to the main
              # changelist page, without parameters, and pass an 'invalid=1'
              # parameter via the query string. If wacky parameters were given
              # and the 'invalid=1' parameter was already in the query string,
              # something is screwed up with the database, so display an error
              # page.
              if ERROR_FLAG in request.GET:
                  return SimpleTemplateResponse('admin/invalid_setup.html', {
                      'title': _('Database error'),
                  })
              return HttpResponseRedirect(request.path + '?' + ERROR_FLAG + '=1')
  
          # If the request was POSTed, this might be a bulk action or a bulk
          # edit. Try to look up an action or confirmation first, but if this
          # isn't an action the POST will fall through to the bulk edit check,
          # below.
          action_failed = False
          selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)
  
          actions = self.get_actions(request)
          # Actions with no confirmation
          if (actions and request.method == 'POST' and
                  'index' in request.POST and '_save' not in request.POST):
              if selected:
                  response = self.response_action(request, queryset=cl.get_queryset(request))
                  if response:
                      return response
                  else:
                      action_failed = True
              else:
                  msg = _("Items must be selected in order to perform "
                          "actions on them. No items have been changed.")
                  self.message_user(request, msg, messages.WARNING)
                  action_failed = True
  
          # Actions with confirmation
          if (actions and request.method == 'POST' and
                  helpers.ACTION_CHECKBOX_NAME in request.POST and
                  'index' not in request.POST and '_save' not in request.POST):
              if selected:
                  response = self.response_action(request, queryset=cl.get_queryset(request))
                  if response:
                      return response
                  else:
                      action_failed = True
  
          if action_failed:
              # Redirect back to the changelist page to avoid resubmitting the
              # form if the user refreshes the browser or uses the "No, take
              # me back" button on the action confirmation page.
              return HttpResponseRedirect(request.get_full_path())
  
          # If we're allowing changelist editing, we need to construct a formset
          # for the changelist given all the fields to be edited. Then we'll
          # use the formset to validate/process POSTed data.
          formset = cl.formset = None
  
          # Handle POSTed bulk-edit data.
          if request.method == 'POST' and cl.list_editable and '_save' in request.POST:
              if not self.has_change_permission(request):
                  raise PermissionDenied
              FormSet = self.get_changelist_formset(request)
              modified_objects = self._get_list_editable_queryset(request, FormSet.get_default_prefix())
              formset = cl.formset = FormSet(request.POST, request.FILES, queryset=modified_objects)
              if formset.is_valid():
                  changecount = 0
                  for form in formset.forms:
                      if form.has_changed():
                          obj = self.save_form(request, form, change=True)
                          self.save_model(request, obj, form, change=True)
                          self.save_related(request, form, formsets=[], change=True)
                          change_msg = self.construct_change_message(request, form, None)
                          self.log_change(request, obj, change_msg)
                          changecount += 1
  
                  if changecount:
                      msg = ngettext(
                          "%(count)s %(name)s was changed successfully.",
                          "%(count)s %(name)s were changed successfully.",
                          changecount
                      ) % {
                          'count': changecount,
                          'name': model_ngettext(opts, changecount),
                      }
                      self.message_user(request, msg, messages.SUCCESS)
  
                  return HttpResponseRedirect(request.get_full_path())
  
          # Handle GET -- construct a formset for display.
          elif cl.list_editable and self.has_change_permission(request):
              FormSet = self.get_changelist_formset(request)
              formset = cl.formset = FormSet(queryset=cl.result_list)
  
          # Build the list of media to be used by the formset.
          if formset:
              media = self.media + formset.media
          else:
              media = self.media
  
          # Build the action form and populate it with available actions.
          if actions:
              action_form = self.action_form(auto_id=None)
              action_form.fields['action'].choices = self.get_action_choices(request)
              media += action_form.media
          else:
              action_form = None
  
          selection_note_all = ngettext(
              '%(total_count)s selected',
              'All %(total_count)s selected',
              cl.result_count
          )
  
          context = {
              **self.admin_site.each_context(request),
              'module_name': str(opts.verbose_name_plural),
              'selection_note': _('0 of %(cnt)s selected') % {'cnt': len(cl.result_list)},
              'selection_note_all': selection_note_all % {'total_count': cl.result_count},
              'title': cl.title,
              'is_popup': cl.is_popup,
              'to_field': cl.to_field,
              'cl': cl,
              'media': media,
              'has_add_permission': self.has_add_permission(request),
              'opts': cl.opts,
              'action_form': action_form,
              'actions_on_top': self.actions_on_top,
              'actions_on_bottom': self.actions_on_bottom,
              'actions_selection_counter': self.actions_selection_counter,
              'preserved_filters': self.get_preserved_filters(request),
              **(extra_context or {}),
          }
  
          request.current_app = self.admin_site.name
  
          return TemplateResponse(request, self.change_list_template or [
              'admin/%s/%s/change_list.html' % (app_label, opts.model_name),
              'admin/%s/change_list.html' % app_label,
              'admin/change_list.html'
          ], context)
  
      def get_deleted_objects(self, objs, request):
          """
          Hook for customizing the delete process for the delete view and the
          "delete selected" action.
          """
          return get_deleted_objects(objs, request, self.admin_site)
  
      @csrf_protect_m
      def delete_view(self, request, object_id, extra_context=None):
          with transaction.atomic(using=router.db_for_write(self.model)):
              return self._delete_view(request, object_id, extra_context)
  
      def _delete_view(self, request, object_id, extra_context):
          "The 'delete' admin view for this model."
          opts = self.model._meta
          app_label = opts.app_label
  
          to_field = request.POST.get(TO_FIELD_VAR, request.GET.get(TO_FIELD_VAR))
          if to_field and not self.to_field_allowed(request, to_field):
              raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)
  
          obj = self.get_object(request, unquote(object_id), to_field)
  
          if not self.has_delete_permission(request, obj):
              raise PermissionDenied
  
          if obj is None:
              return self._get_obj_does_not_exist_redirect(request, opts, object_id)
  
          # Populate deleted_objects, a data structure of all related objects that
          # will also be deleted.
          deleted_objects, model_count, perms_needed, protected = self.get_deleted_objects([obj], request)
  
          if request.POST and not protected:  # The user has confirmed the deletion.
              if perms_needed:
                  raise PermissionDenied
              obj_display = str(obj)
              attr = str(to_field) if to_field else opts.pk.attname
              obj_id = obj.serializable_value(attr)
              self.log_deletion(request, obj, obj_display)
              self.delete_model(request, obj)
  
              return self.response_delete(request, obj_display, obj_id)
  
          object_name = str(opts.verbose_name)
  
          if perms_needed or protected:
              title = _("Cannot delete %(name)s") % {"name": object_name}
          else:
              title = _("Are you sure?")
  
          context = {
              **self.admin_site.each_context(request),
              'title': title,
              'object_name': object_name,
              'object': obj,
              'deleted_objects': deleted_objects,
              'model_count': dict(model_count).items(),
              'perms_lacking': perms_needed,
              'protected': protected,
              'opts': opts,
              'app_label': app_label,
              'preserved_filters': self.get_preserved_filters(request),
              'is_popup': IS_POPUP_VAR in request.POST or IS_POPUP_VAR in request.GET,
              'to_field': to_field,
              **(extra_context or {}),
          }
  
          return self.render_delete_form(request, context)
  
      def history_view(self, request, object_id, extra_context=None):
          "The 'history' admin view for this model."
          from django.contrib.admin.models import LogEntry
          # First check if the user can see this history.
          model = self.model
          obj = self.get_object(request, unquote(object_id))
          if obj is None:
              return self._get_obj_does_not_exist_redirect(request, model._meta, object_id)
  
          if not self.has_view_or_change_permission(request, obj):
              raise PermissionDenied
  
          # Then get the history for this object.
          opts = model._meta
          app_label = opts.app_label
          action_list = LogEntry.objects.filter(
              object_id=unquote(object_id),
              content_type=get_content_type_for_model(model)
          ).select_related().order_by('action_time')
  
          context = {
              **self.admin_site.each_context(request),
              'title': _('Change history: %s') % obj,
              'action_list': action_list,
              'module_name': str(capfirst(opts.verbose_name_plural)),
              'object': obj,
              'opts': opts,
              'preserved_filters': self.get_preserved_filters(request),
              **(extra_context or {}),
          }
  
          request.current_app = self.admin_site.name
  
          return TemplateResponse(request, self.object_history_template or [
              "admin/%s/%s/object_history.html" % (app_label, opts.model_name),
              "admin/%s/object_history.html" % app_label,
              "admin/object_history.html"
          ], context)
  
      def _create_formsets(self, request, obj, change):
          "Helper function to generate formsets for add/change_view."
          formsets = []
          inline_instances = []
          prefixes = {}
          get_formsets_args = [request]
          if change:
              get_formsets_args.append(obj)
          for FormSet, inline in self.get_formsets_with_inlines(*get_formsets_args):
              prefix = FormSet.get_default_prefix()
              prefixes[prefix] = prefixes.get(prefix, 0) + 1
              if prefixes[prefix] != 1 or not prefix:
                  prefix = "%s-%s" % (prefix, prefixes[prefix])
              formset_params = {
                  'instance': obj,
                  'prefix': prefix,
                  'queryset': inline.get_queryset(request),
              }
              if request.method == 'POST':
                  formset_params.update({
                      'data': request.POST.copy(),
                      'files': request.FILES,
                      'save_as_new': '_saveasnew' in request.POST
                  })
              formset = FormSet(**formset_params)
  
              def user_deleted_form(request, obj, formset, index):
                  """Return whether or not the user deleted the form."""
                  return (
                      inline.has_delete_permission(request, obj) and
                      '{}-{}-DELETE'.format(formset.prefix, index) in request.POST
                  )
  
              # Bypass validation of each view-only inline form (since the form's
              # data won't be in request.POST), unless the form was deleted.
              if not inline.has_change_permission(request, obj if change else None):
                  for index, form in enumerate(formset.initial_forms):
                      if user_deleted_form(request, obj, formset, index):
                          continue
                      form._errors = {}
                      form.cleaned_data = form.initial
              formsets.append(formset)
              inline_instances.append(inline)
          return formsets, inline_instances
  
  
  class InlineModelAdmin(BaseModelAdmin):
      """
      Options for inline editing of ``model`` instances.
  
      Provide ``fk_name`` to specify the attribute name of the ``ForeignKey``
      from ``model`` to its parent. This is required if ``model`` has more than
      one ``ForeignKey`` to its parent.
      """
      model = None
      fk_name = None
      formset = BaseInlineFormSet
      extra = 3
      min_num = None
      max_num = None
      template = None
      verbose_name = None
      verbose_name_plural = None
      can_delete = True
      show_change_link = False
      checks_class = InlineModelAdminChecks
      classes = None
  
      def __init__(self, parent_model, admin_site):
          self.admin_site = admin_site
          self.parent_model = parent_model
          self.opts = self.model._meta
          self.has_registered_model = admin_site.is_registered(self.model)
          super().__init__()
          if self.verbose_name is None:
              self.verbose_name = self.model._meta.verbose_name
          if self.verbose_name_plural is None:
              self.verbose_name_plural = self.model._meta.verbose_name_plural
  
      @property
      def media(self):
          extra = '' if settings.DEBUG else '.min'
          js = ['vendor/jquery/jquery%s.js' % extra, 'jquery.init.js',
                'inlines%s.js' % extra]
          if self.filter_vertical or self.filter_horizontal:
              js.extend(['SelectBox.js', 'SelectFilter2.js'])
          if self.classes and 'collapse' in self.classes:
              js.append('collapse%s.js' % extra)
          return forms.Media(js=['admin/js/%s' % url for url in js])
  
      def _has_add_permission(self, request, obj):
          # RemovedInDjango30Warning: obj will be a required argument.
          args = get_func_args(self.has_add_permission)
          return self.has_add_permission(request, obj) if 'obj' in args else self.has_add_permission(request)
  
      def get_extra(self, request, obj=None, **kwargs):
          """Hook for customizing the number of extra inline forms."""
          return self.extra
  
      def get_min_num(self, request, obj=None, **kwargs):
          """Hook for customizing the min number of inline forms."""
          return self.min_num
  
      def get_max_num(self, request, obj=None, **kwargs):
          """Hook for customizing the max number of extra inline forms."""
          return self.max_num
  
      def get_formset(self, request, obj=None, **kwargs):
          """Return a BaseInlineFormSet class for use in admin add/change views."""
          if 'fields' in kwargs:
              fields = kwargs.pop('fields')
          else:
              fields = flatten_fieldsets(self.get_fieldsets(request, obj))
          excluded = self.get_exclude(request, obj)
          exclude = [] if excluded is None else list(excluded)
          exclude.extend(self.get_readonly_fields(request, obj))
          if excluded is None and hasattr(self.form, '_meta') and self.form._meta.exclude:
              # Take the custom ModelForm's Meta.exclude into account only if the
              # InlineModelAdmin doesn't define its own.
              exclude.extend(self.form._meta.exclude)
          # If exclude is an empty list we use None, since that's the actual
          # default.
          exclude = exclude or None
          can_delete = self.can_delete and self.has_delete_permission(request, obj)
          defaults = {
              'form': self.form,
              'formset': self.formset,
              'fk_name': self.fk_name,
              'fields': fields,
              'exclude': exclude,
              'formfield_callback': partial(self.formfield_for_dbfield, request=request),
              'extra': self.get_extra(request, obj, **kwargs),
              'min_num': self.get_min_num(request, obj, **kwargs),
              'max_num': self.get_max_num(request, obj, **kwargs),
              'can_delete': can_delete,
              **kwargs,
          }
  
          base_model_form = defaults['form']
          can_change = self.has_change_permission(request, obj) if request else True
          can_add = self._has_add_permission(request, obj) if request else True
  
          class DeleteProtectedModelForm(base_model_form):
  
              def hand_clean_DELETE(self):
                  """
                  We don't validate the 'DELETE' field itself because on
                  templates it's not rendered using the field information, but
                  just using a generic "deletion_field" of the InlineModelAdmin.
                  """
                  if self.cleaned_data.get(DELETION_FIELD_NAME, False):
                      using = router.db_for_write(self._meta.model)
                      collector = NestedObjects(using=using)
                      if self.instance._state.adding:
                          return
                      collector.collect([self.instance])
                      if collector.protected:
                          objs = []
                          for p in collector.protected:
                              objs.append(
                                  # Translators: Model verbose name and instance representation,
                                  # suitable to be an item in a list.
                                  _('%(class_name)s %(instance)s') % {
                                      'class_name': p._meta.verbose_name,
                                      'instance': p}
                              )
                          params = {
                              'class_name': self._meta.model._meta.verbose_name,
                              'instance': self.instance,
                              'related_objects': get_text_list(objs, _('and')),
                          }
                          msg = _("Deleting %(class_name)s %(instance)s would require "
                                  "deleting the following protected related objects: "
                                  "%(related_objects)s")
                          raise ValidationError(msg, code='deleting_protected', params=params)
  
              def is_valid(self):
                  result = super().is_valid()
                  self.hand_clean_DELETE()
                  return result
  
              def has_changed(self):
                  # Protect against unauthorized edits.
                  if not can_change and not self.instance._state.adding:
                      return False
                  if not can_add and self.instance._state.adding:
                      return False
                  return super().has_changed()
  
          defaults['form'] = DeleteProtectedModelForm
  
          if defaults['fields'] is None and not modelform_defines_fields(defaults['form']):
              defaults['fields'] = forms.ALL_FIELDS
  
          return inlineformset_factory(self.parent_model, self.model, **defaults)
  
      def _get_form_for_get_fields(self, request, obj=None):
          return self.get_formset(request, obj, fields=None).form
  
      def get_queryset(self, request):
          queryset = super().get_queryset(request)
          if not self.has_view_or_change_permission(request):
              queryset = queryset.none()
          return queryset
  
      def _has_any_perms_for_target_model(self, request, perms):
          """
          This method is called only when the ModelAdmin's model is for an
          ManyToManyField's implicit through model (if self.opts.auto_created).
          Return True if the user has any of the given permissions ('add',
          'change', etc.) for the model that points to the through model.
          """
          opts = self.opts
          # Find the target model of an auto-created many-to-many relationship.
          for field in opts.fields:
              if field.remote_field and field.remote_field.model != self.parent_model:
                  opts = field.remote_field.model._meta
                  break
          return any(
              request.user.has_perm('%s.%s' % (opts.app_label, get_permission_codename(perm, opts)))
              for perm in perms
          )
  
      def has_add_permission(self, request, obj=None):
          # RemovedInDjango30Warning: obj becomes a mandatory argument.
          if self.opts.auto_created:
              # Auto-created intermediate models don't have their own
              # permissions. The user needs to have the change permission for the
              # related model in order to be able to do anything with the
              # intermediate model.
              return self._has_any_perms_for_target_model(request, ['change'])
          return super().has_add_permission(request)
  
      def has_change_permission(self, request, obj=None):
          if self.opts.auto_created:
              # Same comment as has_add_permission().
              return self._has_any_perms_for_target_model(request, ['change'])
          return super().has_change_permission(request)
  
      def has_delete_permission(self, request, obj=None):
          if self.opts.auto_created:
              # Same comment as has_add_permission().
              return self._has_any_perms_for_target_model(request, ['change'])
          return super().has_delete_permission(request, obj)
  
      def has_view_permission(self, request, obj=None):
          if self.opts.auto_created:
              # Same comment as has_add_permission(). The 'change' permission
              # also implies the 'view' permission.
              return self._has_any_perms_for_target_model(request, ['view', 'change'])
          return super().has_view_permission(request)
  
  
  class StackedInline(InlineModelAdmin):
      template = 'admin/edit_inline/stacked.html'
  
  
  class TabularInline(InlineModelAdmin):
      template = 'admin/edit_inline/tabular.html'
  