text: from django.db import models
  from django.contrib.contenttypes.models import ContentType
  from django.contrib.auth.models import User
  from django.contrib.admin.util import quote
  from django.utils.translation import ugettext_lazy as _
  from django.utils.encoding import smart_unicode
  from django.utils.safestring import mark_safe
  
  ADDITION = 1
  CHANGE = 2
  DELETION = 3
  
  class LogEntryManager(models.Manager):
      def log_action(self, user_id, content_type_id, object_id, object_repr, action_flag, change_message=''):
          e = self.model(None, None, user_id, content_type_id, smart_unicode(object_id), object_repr[:200], action_flag, change_message)
          e.save()
  
  class LogEntry(models.Model):
      action_time = models.DateTimeField(_('action time'), auto_now=True)
      user = models.ForeignKey(User)
      content_type = models.ForeignKey(ContentType, blank=True, null=True)
      object_id = models.TextField(_('object id'), blank=True, null=True)
      object_repr = models.CharField(_('object repr'), max_length=200)
      action_flag = models.PositiveSmallIntegerField(_('action flag'))
      change_message = models.TextField(_('change message'), blank=True)
      objects = LogEntryManager()
      class Meta:
          verbose_name = _('log entry')
          verbose_name_plural = _('log entries')
          db_table = 'django_admin_log'
          ordering = ('-action_time',)
  
      def __repr__(self):
          return smart_unicode(self.action_time)
  
      def is_addition(self):
          return self.action_flag == ADDITION
  
      def is_change(self):
          return self.action_flag == CHANGE
  
      def is_deletion(self):
          return self.action_flag == DELETION
  
      def get_edited_object(self):
          "Returns the edited object represented by this log entry"
          return self.content_type.get_object_for_this_type(pk=self.object_id)
  
      def get_admin_url(self):
          """
          Returns the admin URL to edit the object represented by this log entry.
          This is relative to the Django admin index page.
          """
          return mark_safe(u"%s/%s/%s/" % (self.content_type.app_label, self.content_type.model, quote(self.object_id)))
  