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.core import meta
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class Person(meta.Model):
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full_name = meta.CharField(maxlength=20)
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mother = meta.ForeignKey('self', null=True, related_name='mothers_child')
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father = meta.ForeignKey('self', null=True, related_name='fathers_child')
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def __repr__(self):
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return self.full_name
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API_TESTS = """
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# Create two Person objects -- the mom and dad in our family.
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>>> dad = persons.Person(full_name='John Smith Senior', mother=None, father=None)
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>>> dad.save()
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>>> mom = persons.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 = persons.Person(full_name='John Smith Junior', mother=mom, father=dad)
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>>> kid.save()
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>>> kid.get_mother()
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Jane Smith
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>>> kid.get_father()
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John Smith Senior
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>>> dad.get_fathers_child_list()
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[John Smith Junior]
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>>> mom.get_mothers_child_list()
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[John Smith Junior]
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>>> kid.get_mothers_child_list()
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[]
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>>> kid.get_fathers_child_list()
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[]
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"""
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