1 """

     2 24. Mutually referential many-to-one relationships

     3 

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

     5 """

     6 

     7 from django.db.models import *

     8 

     9 class Parent(Model):

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

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

    12 

    13 class Child(Model):

    14     name = CharField(maxlength=100)

    15     parent = ForeignKey(Parent)

    16 

    17 __test__ = {'API_TESTS':"""

    18 # Create a Parent

    19 >>> q = Parent(name='Elizabeth')

    20 >>> q.save()

    21 

    22 # Create some children

    23 >>> c = q.child_set.create(name='Charles')

    24 >>> e = q.child_set.create(name='Edward')

    25 

    26 # Set the best child

    27 >>> q.bestchild = c

    28 >>> q.save()

    29 

    30 >>> q.delete()

    31 

    32 """}