Question

i have a signal –

@receiver(post_save, sender=User)
def create_initial_story(sender,instance, signal, created, **kwargs):
    if created:
        Story(user = instance, title = 'Random Stories',
            description="Random stories",
            is_closed = False, is_random = True).save()

which is cool and all, but i really don’t want to have this signal in my models.py

it gets “double imported” somehow, and i would rather that not happen. Yes, i know about the magic trick to stop a signal being run twice, but i just don’t trust that. Why have my app do twice the work! Crazy!

Somebody suggested i use django.db.models.get_model, but i do not know how to do this! My attempt did not quite work – here is what i tried:

from django.db.models import get_model

@receiver(post_save, sendermodel('myapp','User'))
def create_initial_story(sender,instance, signal, created, **kwargs):
    if created:
        get_model('myapp','Story').(user = instance, title = 'Random Stories',
            description="Random stories",
            is_closed = False, is_random = True).save()

this yields an exception –

Cannot assign “< Story: Random Stories >”: “Story.user” must be a “User” instance.

So! What can i do to fix this?

Answer 1

You problem is here:

get_model('myapp','Story').(user = instance, title = 'Random Stories',
        description="Random stories",
        is_closed = False, is_random = True).save()

get_model returns the model class, so you still need objects.create to actually create an instance. And, you don’t need the save() at the end. Try:

get_model('myapp','Story').objects.create(user = instance, title = 'Random Stories',
        description="Random stories",
        is_closed = False, is_random = True)