24f4a4b26f
Backport of r13778 from trunk. git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13795 bcc190cf-cafb-0310-a4f2-bffc1f526a37
43 lines
967 B
Python
43 lines
967 B
Python
# coding: utf-8
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"""
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Tests for some corner cases with deleting.
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"""
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from django.db import models
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class DefaultRepr(object):
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def __repr__(self):
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return u"<%s: %s>" % (self.__class__.__name__, self.__dict__)
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class A(DefaultRepr, models.Model):
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pass
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class B(DefaultRepr, models.Model):
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a = models.ForeignKey(A)
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class C(DefaultRepr, models.Model):
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b = models.ForeignKey(B)
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class D(DefaultRepr, models.Model):
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c = models.ForeignKey(C)
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a = models.ForeignKey(A)
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# Simplified, we have:
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# A
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# B -> A
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# C -> B
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# D -> C
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# D -> A
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# So, we must delete Ds first of all, then Cs then Bs then As.
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# However, if we start at As, we might find Bs first (in which
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# case things will be nice), or find Ds first.
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# Some mutually dependent models, but nullable
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class E(DefaultRepr, models.Model):
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f = models.ForeignKey('F', null=True, related_name='e_rel')
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class F(DefaultRepr, models.Model):
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e = models.ForeignKey(E, related_name='f_rel')
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