author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Mon, 18 May 2009 19:37:38 +0200 | |
changeset 2327 | 6c7d0fba105c |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
109
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
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""" |
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parents:
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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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parents:
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which are other ``Person`` objects. |
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parents:
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|
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Set ``related_name`` to designate what the reverse relationship is called. |
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parents:
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""" |
620f9b141567
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Todd Larsen <tlarsen@google.com>
parents:
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parents:
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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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|
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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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"""} |