text: from django.contrib import auth
  from django.contrib.auth.management import create_permissions
  from django.contrib.auth.models import (
      python_2_unicode_compatible,
      GroupManager,
      _user_get_all_permissions,
      _user_has_perm,
      _user_has_module_perms
  )
  from django.db import models
  from django.db.models import signals
  from django.utils.translation import ugettext_lazy as _
  from django.utils.functional import lazy
  
  from djangae.fields import ListField, RelatedSetField
  from djangae.contrib.gauth.common.models import GaeAbstractBaseUser
  from djangae.contrib.gauth.datastore.permissions import get_permission_choices
  
  
  @python_2_unicode_compatible
  class Group(models.Model):
      """
          This is a clone of django.contrib.auth.Group, but nonrelationalized. Doesn't user Permission but directly
          uses the permission names
      """
      name = models.CharField(_('name'), max_length=80, unique=True)
      permissions = ListField(models.CharField(max_length=500),
          verbose_name=_('permissions'), blank=True
      )
  
      objects = GroupManager()
  
      class Meta:
          verbose_name = _('group')
          verbose_name_plural = _('groups')
          app_label = "djangae"
  
      def __str__(self):
          return self.name
  
      def natural_key(self):
          return (self.name,)
  
      def __init__(self, *args, **kwargs):
          """We need to override this to make the choices lazy and prevent import madness"""
          super(Group, self).__init__(*args, **kwargs)
  
          field = self._meta.get_field_by_name('permissions')[0]
          field._choices = lazy(get_permission_choices, list)()
          field.item_field_type._choices = lazy(get_permission_choices, list)()
  
  
  class PermissionsMixin(models.Model):
      """
      A mixin class that adds the fields and methods necessary to support
      Django's Group and Permission model using the ModelBackend.
      """
      is_superuser = models.BooleanField(_('superuser status'), default=False,
          help_text=_('Designates that this user has all permissions without '
                      'explicitly assigning them.')
      )
  
      groups = RelatedSetField(
          Group,
          verbose_name=_('groups'),
          blank=True, help_text=_('The groups this user belongs to. A user will '
                                  'get all permissions granted to each of '
                                  'his/her group.')
      )
  
      user_permissions = ListField(
          models.CharField(max_length=500),
          verbose_name=_('user permissions'), blank=True,
          help_text='Specific permissions for this user.'
      )
  
      class Meta:
          abstract = True
  
      def __init__(self, *args, **kwargs):
          """We need to override this to make the choices lazy and prevent import madness"""
          super(PermissionsMixin, self).__init__(*args, **kwargs)
          self._meta.get_field_by_name('user_permissions')[0]._choices = lazy(get_permission_choices, list)()
  
      def get_group_permissions(self, obj=None):
          """
          Returns a list of permission strings that this user has through his/her
          groups. This method queries all available auth backends. If an object
          is passed in, only permissions matching this object are returned.
          """
          permissions = set()
          for backend in auth.get_backends():
              if hasattr(backend, "get_group_permissions"):
                  if obj is not None:
                      permissions.update(backend.get_group_permissions(self,
                                                                       obj))
                  else:
                      permissions.update(backend.get_group_permissions(self))
          return permissions
  
      def get_all_permissions(self, obj=None):
          return _user_get_all_permissions(self, obj)
  
      def has_perm(self, perm, obj=None):
          """
          Returns True if the user has the specified permission. This method
          queries all available auth backends, but returns immediately if any
          backend returns True. Thus, a user who has permission from a single
          auth backend is assumed to have permission in general. If an object is
          provided, permissions for this specific object are checked.
          """
  
          # Active superusers have all permissions.
          if self.is_active and self.is_superuser:
              return True
  
          # Otherwise we need to check the backends.
          return _user_has_perm(self, perm, obj)
  
      def has_perms(self, perm_list, obj=None):
          """
          Returns True if the user has each of the specified permissions. If
          object is passed, it checks if the user has all required perms for this
          object.
          """
          for perm in perm_list:
              if not self.has_perm(perm, obj):
                  return False
          return True
  
      def has_module_perms(self, app_label):
          """
          Returns True if the user has any permissions in the given app label.
          Uses pretty much the same logic as has_perm, above.
          """
          # Active superusers have all permissions.
          if self.is_active and self.is_superuser:
              return True
  
          return _user_has_module_perms(self, app_label)
  
  
  class GaeAbstractDatastoreUser(GaeAbstractBaseUser, PermissionsMixin):
      """ Base class for a user model which can be used with GAE authentication
          and permissions on the Datastore.
      """
  
      class Meta:
          abstract = True
  
  
  class GaeDatastoreUser(GaeAbstractBaseUser, PermissionsMixin):
      """ A basic user model which can be used with GAE authentication and allows
          permissions to work on the Datastore backend.
      """
  
      class Meta:
          app_label = "djangae"
          swappable = 'AUTH_USER_MODEL'
          verbose_name = _('user')
          verbose_name_plural = _('users')
  
  
  # This is slightly unnecessary, because if the project is importing this file then it is *probably*
  # using one of the user models defined in here.  But for the sake of not getting things in a twist
  # when switching user models in tests, etc, we still use this conditional bypassing of the call to
  # Django's create_permissions() function
  
  def lazy_permission_creation(**kwargs):
      if issubclass(auth.get_user_model(), PermissionsMixin):
          return
  
      # Call through to Django's create_permissions
      create_permissions(**kwargs)
  
  #We disconnect the built-in Django permission creation when using our custom user model
  if hasattr(signals, "post_migrate"):
      signals.post_migrate.disconnect(dispatch_uid="django.contrib.auth.management.create_permissions")
      signals.post_migrate.connect(lazy_permission_creation, dispatch_uid="django.contrib.auth.management.create_permissions")
  
  if hasattr(signals, "post_syncdb"):
      signals.post_syncdb.disconnect(dispatch_uid="django.contrib.auth.management.create_permissions")
      signals.post_syncdb.connect(lazy_permission_creation, dispatch_uid="django.contrib.auth.management.create_permissions")
  