author | Sverre Rabbelier <srabbelier@gmail.com> |
Thu, 02 Apr 2009 23:05:31 +0000 | |
changeset 2056 | bbd16a156bde |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
109
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
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""" |
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parents:
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29. Many-to-many and many-to-one relationships to the same table |
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|
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Make sure to set ``related_name`` if you use relationships to the same table. |
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parents:
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""" |
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parents:
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from django.db import models |
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class User(models.Model): |
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username = models.CharField(maxlength=20) |
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class Issue(models.Model): |
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num = models.IntegerField() |
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cc = models.ManyToManyField(User, blank=True, related_name='test_issue_cc') |
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client = models.ForeignKey(User, related_name='test_issue_client') |
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def __str__(self): |
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return str(self.num) |
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|
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class Meta: |
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ordering = ('num',) |
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|
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__test__ = {'API_TESTS':""" |
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>>> Issue.objects.all() |
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[] |
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>>> r = User(username='russell') |
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>>> r.save() |
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>>> g = User(username='gustav') |
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>>> g.save() |
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>>> i = Issue(num=1) |
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>>> i.client = r |
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>>> i.save() |
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>>> i2 = Issue(num=2) |
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>>> i2.client = r |
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>>> i2.save() |
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>>> i2.cc.add(r) |
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>>> i3 = Issue(num=3) |
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>>> i3.client = g |
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>>> i3.save() |
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>>> i3.cc.add(r) |
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>>> from django.db.models.query import Q |
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>>> Issue.objects.filter(client=r.id) |
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[<Issue: 1>, <Issue: 2>] |
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>>> Issue.objects.filter(client=g.id) |
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[<Issue: 3>] |
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>>> Issue.objects.filter(cc__id__exact=g.id) |
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[] |
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>>> Issue.objects.filter(cc__id__exact=r.id) |
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[<Issue: 2>, <Issue: 3>] |
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# These queries combine results from the m2m and the m2o relationships. |
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# They're three ways of saying the same thing. |
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>>> Issue.objects.filter(Q(cc__id__exact=r.id) | Q(client=r.id)) |
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[<Issue: 1>, <Issue: 2>, <Issue: 3>] |
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>>> Issue.objects.filter(cc__id__exact=r.id) | Issue.objects.filter(client=r.id) |
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[<Issue: 1>, <Issue: 2>, <Issue: 3>] |
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>>> Issue.objects.filter(Q(client=r.id) | Q(cc__id__exact=r.id)) |
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[<Issue: 1>, <Issue: 2>, <Issue: 3>] |
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"""} |