Django - Circular model import issue

Upto Django 1.7:

Use get_model function from django.db.models which is designed for lazy model imports.:

from django.db.models import get_model
MyModel = get_model('app_name', 'ModelName')

In your case:

from django.db.models import get_model
Theme = get_model('themes', 'Theme')

Now you can use Theme

For Django 1.7+:

from django.apps import apps
apps.get_model('app_label.model_name')

Remove the import of Theme and use the model name as a string instead.

theme = models.ForeignKey('themes.Theme')

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