mirror of https://github.com/django/django.git
67 lines
1.6 KiB
Python
67 lines
1.6 KiB
Python
"""
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28. Many-to-many and many-to-one relationships to the same table
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Make sure to set ``related_name`` if you use relationships to the same table.
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"""
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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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class Meta:
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ordering = ('num',)
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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.validate()
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{}
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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.validate()
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{}
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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.validate()
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{}
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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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# Queries that combine results from the m2m and the m2o relationship.
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# 3 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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"""
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