"""

Mutually referential many-to-one relationships

Strings can be used instead of model literals to set up "lazy" relations.

"""

from django.db import models

class Parent(models.Model):

    name = models.CharField(max_length=100)

    # Use a simple string for forward declarations.

    bestchild = models.ForeignKey(

        "Child", models.SET_NULL, null=True, related_name="favored_by"

    )

class Child(models.Model):

    name = models.CharField(max_length=100)

    # You can also explicitly specify the related app.

    parent = models.ForeignKey("mutually_referential.Parent", models.CASCADE)