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git-svn-id: http://code.djangoproject.com/svn/django/trunk@3661 bcc190cf-cafb-0310-a4f2-bffc1f526a37
44 lines
1.2 KiB
Python
44 lines
1.2 KiB
Python
"""
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12. Relating a model to another model more than once
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In this example, a ``Person`` can have a ``mother`` and ``father`` -- both of
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which are other ``Person`` objects.
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Set ``related_name`` to designate what the reverse relationship is called.
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"""
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from django.db import models
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class Person(models.Model):
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full_name = models.CharField(maxlength=20)
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mother = models.ForeignKey('self', null=True, related_name='mothers_child_set')
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father = models.ForeignKey('self', null=True, related_name='fathers_child_set')
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def __str__(self):
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return self.full_name
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__test__ = {'API_TESTS':"""
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# Create two Person objects -- the mom and dad in our family.
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>>> dad = Person(full_name='John Smith Senior', mother=None, father=None)
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>>> dad.save()
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>>> mom = Person(full_name='Jane Smith', mother=None, father=None)
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>>> mom.save()
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# Give mom and dad a kid.
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>>> kid = Person(full_name='John Smith Junior', mother=mom, father=dad)
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>>> kid.save()
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>>> kid.mother
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<Person: Jane Smith>
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>>> kid.father
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<Person: John Smith Senior>
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>>> dad.fathers_child_set.all()
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[<Person: John Smith Junior>]
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>>> mom.mothers_child_set.all()
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[<Person: John Smith Junior>]
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>>> kid.mothers_child_set.all()
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[]
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>>> kid.fathers_child_set.all()
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[]
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"""}
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