Question

我正在尝试批量删除我的Django网站的开发实例上的所有注释，而Django正在引发一个AttributeException。

我在python提示符下有以下代码：

>>> from django.contrib.comments.models import Comment
>>> Comment.objects.all().delete()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/jeff/.virtualenvs/osl_main-website/lib/python2.6/site-packages/django/db/models/query.py", line 441, in delete
    obj._collect_sub_objects(seen_objs)
  File "/home/jeff/.virtualenvs/osl_main-website/lib/python2.6/site-packages/django/db/models/base.py", line 569, in _collect_sub_objects
    sub_obj._collect_sub_objects(seen_objs, self, related.field.null)
  File "/home/jeff/.virtualenvs/osl_main-website/lib/python2.6/site-packages/django/db/models/base.py", line 585, in _collect_sub_objects
    delete_qs = rel_descriptor.delete_manager(self).all()
AttributeError: 'ReverseSingleRelatedObjectDescriptor' object has no attribute 'delete_manager'

我不确定为什么删除语句不起作用。任何人都可以帮助我解决为什么这不起作用以及我能做些什么来解决它？

有关我的模特的其他详细信息：

我有另一个名为OslComment的模型，它继承自Comment。我还有一个Vote模型，指向OslComment中的条目。

BaseCommentAbstractModel

class BaseCommentAbstractModel(models.Model):
    """
    An abstract base class that any custom comment models probably should
    subclass.
    """

    # Content-object field
    content_type   = models.ForeignKey(ContentType,
            verbose_name=_('content type'),
            related_name="content_type_set_for_%(class)s")
    object_pk      = models.TextField(_('object ID'))
    content_object = generic.GenericForeignKey(ct_field="content_type", fk_field="object_pk")

    # Metadata about the comment
    site        = models.ForeignKey(Site)

注释

class Comment(BaseCommentAbstractModel):
    """
    A user comment about some object.
    """

    # Who posted this comment? If ``user`` is set then it was an authenticated
    # user; otherwise at least user_name should have been set and the comment
    # was posted by a non-authenticated user.
    user        = models.ForeignKey(User, verbose_name=_('user'),
                    blank=True, null=True, related_name="%(class)s_comments")
    user_name   = models.CharField(_("user's name"), max_length=50, blank=True)
    user_email  = models.EmailField(_("user's email address"), blank=True)
    user_url    = models.URLField(_("user's URL"), blank=True)

    comment = models.TextField(_('comment'), max_length=COMMENT_MAX_LENGTH)

    # Metadata about the comment
    submit_date = models.DateTimeField(_('date/time submitted'), default=None)
    ip_address  = models.IPAddressField(_('IP address'), blank=True, null=True)
    is_public   = models.BooleanField(_('is public'), default=True,
                    help_text=_('Uncheck this box to make the comment effectively ' \
                                'disappear from the site.'))
    is_removed  = models.BooleanField(_('is removed'), default=False,
                    help_text=_('Check this box if the comment is inappropriate. ' \
                                'A "This comment has been removed" message will ' \
                                'be displayed instead.'))

OslComment

class OslComment(Comment):
    parent_comment = models.ForeignKey(Comment, blank=True, null=True, related_name='parent_comment')
    inline_to_object = models.BooleanField(default=False)
    edit_timestamp = models.DateTimeField()
    transformed_comment = models.TextField(editable=False)
    is_deleted_by_user = models.BooleanField(default=False)

投票

class Vote(models.Model):
    """
    A vote on an object by a User.
    """
    user         = models.ForeignKey(User)
    content_type = models.ForeignKey(ContentType)
    object_id    = models.PositiveIntegerField()
    object       = generic.GenericForeignKey('content_type', 'object_id')
    vote         = models.SmallIntegerField(choices=SCORES)

其他信息：

Python版本：2.6.5
操作系统：Linux Mint 9（Linux 2.6.32-21-generic）
Django：1.2
数据库驱动程序：postgresql_psycopg2（2.2.1）

Answer 1

编辑：最初我以为你不能在QuerySet上做delete（）并且建议你迭代这些项目，但显然你可以做那样的批量删除。尽管如此，尝试迭代QuerySet可能会为您提供更好的线索。

尝试批量删除Django中的项目时引发的AttributeError异常

1 个答案: