django 信号未按预期工作

Question

我正在尝试创建一个项目，在 blog 的帮助下创建用户的提要/事件提要.

这些是模型 -

class StreamItem(models.Model):
    user = models.ForeignKey(User)
    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    pub_date = models.DateTimeField(default=datetime.now)
    content_object = generic.GenericForeignKey('content_type', 'object_id')

    @property 
    def content_class(self):
        return self.content_type.model


class Blog(models.Model):
    user = models.ForeignKey(User)
    title = models.CharField(max_length=300)
    body = models.TextField()
    pub_date = models.DateTimeField(default=datetime.now)


class Photo(models.Model):
    user = models.ForeignKey(User)
    title = models.CharField(max_length=200)
    image = models.ImageField(upload_to=get_upload_file_name)
    pub_date = models.DateTimeField(default=datetime.now)

这是signals.py:

__init__.py
from django.db.models import signals
from django.contrib.contenttypes.models import ContentType
from django.dispatch import dispatcher
from blogs.models import Blog
from picture.models import Photo
from models import StreamItem

def create_stream_item(sender, instance, signal, *args, **kwargs):

    # Check to see if the object was just created for the first time

    if 'created' in kwargs:
        if kwargs['created']:
            create = True

            # Get the instance's content type

            ctype = ContentType.object.get_for_model(instance)

            if create:
                si = StreamItem.objects.get_or_create(user=instance.user, content_type=ctype, object_id=instance.id, pub_date = instance.pub_date)

 # Send a signal on post_save for each of these models

for modelname in [Blog, Photo]:
    dispatcher.connect(create_stream_item, signal=signals.post_save, sender=modelname)

当我创建博客或上传照片时， signal不起作用。而且我也没有收到任何错误。但我可以手动将项目添加到 StreamItem使用管理员的应用程序，并且 StreamItem 确实可以按我的意愿工作。我认为signals.py有问题。请帮帮我。将不胜感激。谢谢你。

Answer 1

您必须确保在 django 启动后立即加载信号。
确保它的一种可能方法是将模块导入 __init__.py

# __init__.py
# add the below line and run the project again
import signals