Signals not working as expected

I am trying to create a project for creating feeds/activity feeds of a user with the help of a blog.

These are the models -

    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)

And this is the signals.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(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)

When I create a blog or upload a photo, the `signal` does not work. But I can manually add items to the `StreamItem` app using the admin, and the StreamItem does work as I want it to be. I think there's problem with the signals.py. Please help me out. Would be much appreciate. Thank you.

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