How to cross-link models of different Django applications?

Question

Django

The situation is this:

• There are 2 applications that are loaded in turn in settings.py, first web, then catalog
  
• The Web application imports models from the Catalog application
  
• And in the Catalog application, it is not possible to import models from the Web application due to the order in which applications are loaded
  

How to cross-link models of different Django applications?
If you change the order of loading applications, then the situation changes completely opposite.

Answer 1

Do not import model classes, but pass in ForeignKeyor ManyToManyFieldpass a string with the class name, instead of the class itself:

class A(models.Model):
    b = models.ForeignKey('B')