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tests/modeltests/m2o_recursive2/models.py

 

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"""

 

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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(max_length=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 __unicode__(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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