"""

24. Mutually referential many-to-one relationships

To define a many-to-one relationship, use ``ForeignKey()`` .

"""

from django.db.models import *

class Parent(Model):

    name = CharField(maxlength=100, core=True)

    bestchild = ForeignKey("Child", null=True, related_name="favoured_by")

class Child(Model):

    name = CharField(maxlength=100)

    parent = ForeignKey(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()

"""}