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我正在构建一个应用程序，当出现新的ThreadedComments时通知用户。为此，我正在使用post_save信号。这是我的models.py：

from django.db import models
from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
from datetime import datetime

from threadedcomments.models import ThreadedComment
from django.db.models.signals import post_save

from blog.models import Post
from topics.models import Topic

class BuzzEvent(models.Model):
    user = models.ForeignKey(User)
    time = models.DateTimeField(default=datetime.now)

    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    content_object = generic.GenericForeignKey()

    def __unicode__(self):
        return self.content_object

def buzz_on_comment(sender, **kwargs):
    # This is called when there is a new ThreadedComment
    comment = kwargs['instance']

    user_attr_names = {
                  'post'    : 'author',
                  'topic'   : 'creator',
                  'tribe'   : 'creator',
                 }

    user = getattr(comment.content_object, 
                   user_attr_names[comment.content_type.model])

    BuzzEvent.objects.create(content_object=sender,
                             user=user,
                             time=datetime.now())

post_save.connect(buzz_on_comment, sender=ThreadedComment)

问题是当创建一个新的 ThreadedComment 时，我得到一个错误：unbound method _get_pk_val() must be called with ThreadedComment instance as first argument (got nothing instead)。Traceback 和调试器说它发生在创建 BuzzEvent 对象调用时signals.pre_init.send。我现在无法破解 django 代码，有什么明显的解决方案或想法吗？

4

1 回答 1

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看起来它应该是模型实例（它comment是）而不是模型类（它sender是）作为 content_object 参数：

BuzzEvent.objects.create(content_object=comment,
                         user=user)
于 2010-07-13T05:10:16.643 回答