Question

我正在尝试创建一个项目，用于在blog的帮助下创建用户的Feed /活动供稿。

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)

这就是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。我也没有收到任何错误。但我可以使用管理员手动将项目添加到StreamItem应用程序，StreamItem可以按我的意愿运行。我认为signals.py存在问题。请帮帮我。非常感谢。谢谢。

Answer 1

您必须确保在启动django后很快加载信号。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

Answer 2

除非您省略了代码，否则信号处理程序创建的新si项缺少必填字段user。您可能需要将其添加到get_or_create来电。

django信号没有按预期工作

2 个答案: