Django用户认证系统 组与权限解析

groups = models.ManyToManyField(Group, verbose_name=_('groups'),
  blank=True, help_text=_('The groups this user belongs to. A user will '
              'get all permissions granted to each of '
              'their groups.'),
  related_name="user_set", related_query_name="user")
user_permissions = models.ManyToManyField(Permission,
  verbose_name=_('user permissions'), blank=True,
  help_text=_('Specific permissions for this user.'),
  related_name="user_set", related_query_name="user")

myuser.groups = [group_list]
myuser.groups.add(group, group, ...)
myuser.groups.remove(group, group, ...)
myuser.groups.clear()
myuser.user_permissions = [permission_list]
myuser.user_permissions.add(permission, permission, ...)
myuser.user_permissions.remove(permission, permission, ...)
myuser.user_permissions.clear()

@python_2_unicode_compatible
class Permission(models.Model):
  """
  The permissions system provides a way to assign permissions to specific
  users and groups of users.
 
  The permission system is used by the <div>本文来源gaodai.ma#com搞#代!码网_</div>Django admin site, but may also be
  useful in your own code. The Django admin site uses permissions as follows:
 
    - The "add" permission limits the user's ability to view the "add" form
     and add an object.
    - The "change" permission limits a user's ability to view the change
     list, view the "change" form and change an object.
    - The "delete" permission limits the ability to delete an object.
 
  Permissions are set globally per type of object, not per specific object
  instance. It is possible to say "Mary may change news stories," but it's
  not currently possible to say "Mary may change news stories, but only the
  ones she created herself" or "Mary may only change news stories that have a
  certain status or publication date."
 
  Three basic permissions -- add, change and delete -- are automatically
  created for each Django model.
  """
  name = models.CharField(_('name'), max_length=255)
  content_type = models.ForeignKey(ContentType)
  codename = models.CharField(_('codename'), max_length=100)
  objects = PermissionManager()
 
  class Meta:
    verbose_name = _('permission')
    verbose_name_plural = _('permissions')
    unique_together = (('content_type', 'codename'),)
    ordering = ('content_type__app_label', 'content_type__model',
          'codename')
 
  def __str__(self):
    return "%s | %s | %s" % (
      six.text_type(self.content_type.app_label),
      six.text_type(self.content_type),
      six.text_type(self.name))
 
  def natural_key(self):
    return (self.codename,) + self.content_type.natural_key()
  natural_key.dependencies = ['contenttypes.contenttype']

from django.db import models
 
class Vote(models.Model):
  ... 
  class Meta:
    permissions = (("can_vote", "Can Vote"),)