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"""
24. Mutually referential many-to-one relationships
Strings can be used instead of model literals to set up "lazy" relations.
"""
from django.db.models import *
class Parent(Model):
name = CharField(max_length=100)
# Use a simple string for forward declarations.
bestchild = ForeignKey("Child", null=True, related_name="favoured_by")
class Child(Model):
name = CharField(max_length=100)
# You can also explicitally specify the related app.
parent = ForeignKey("mutually_referential.Parent")
__test__ = {'API_TESTS':"""
# Create a Parent
>>> q = Parent(name='Elizabeth')
>>> q.save()
# Create some children
>>> c = q.child_set.create(name='Charles')
>>> e = q.child_set.create(name='Edward')
# Set the best child
>>> q.bestchild = c
>>> q.save()
>>> q.delete()
"""}
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