CODEWITHSUNDEEP
pythondatabasedjangodatabase-designdjango-models
Zach
Zach

Reputation: 1018

Django Circular Model Dependency

I have a circular dependency in my Django models, such that model A has a foreign key reference to B, while B has a many-to-many reference to A. I've consulted other SO posts and have used the string model names instead of the actual classes, but to no avail. Here are abbreviated versions of my two classes:

User model

import listings.models

class User(models.Model):
    ...
    favorites = models.ManyToManyField('listings.models.Listing')

Listing model

import users.models

class Listing(models.Model):
    ...
    owner = models.ForeignKey('users.models.User')

Every time I attempt to run syncdb, it outputs the following error:

Error: One or more models did not validate: users.user: 'favorites' has an m2m relation with model listings.models.Listing, which has either not been installed or is abstract. listings.listing: 'owner' has a relation with model users.models.User, which has either not been installed or is abstract.

How do I resolve this without sacrificing the established relationship?

Upvotes: 8

Views: 4551

Answers (2)

jpic
jpic

Reputation: 33410

  • 'listings.models.Listing' should be 'listings.Listing'
  • 'users.models.User' should be 'users.User' (or 'auth.User' if you were to use django.contrib.auth.models.User)

Refer to official documentation for more.

Upvotes: 9

Rustem
Rustem

Reputation: 2932

You can just delete your imports because, you're not depend on them on code. You use just string with model name - it's not a dependency. Also you should delete models - from your strings because you can refer to your model as app_name.model_name

Upvotes: 0

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