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fd0cc45828
valid field names in debugging output so that it doesn't confuse things. git-svn-id: http://code.djangoproject.com/svn/django/trunk@8730 bcc190cf-cafb-0310-a4f2-bffc1f526a37
64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
from django.db import models
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# No related name is needed here, since symmetrical relations are not
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# explicitly reversible.
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class SelfRefer(models.Model):
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name = models.CharField(max_length=10)
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references = models.ManyToManyField('self')
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related = models.ManyToManyField('self')
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def __unicode__(self):
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return self.name
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class Tag(models.Model):
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name = models.CharField(max_length=10)
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def __unicode__(self):
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return self.name
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# A related_name is required on one of the ManyToManyField entries here because
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# they are both addressable as reverse relations from Tag.
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class Entry(models.Model):
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name = models.CharField(max_length=10)
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topics = models.ManyToManyField(Tag)
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related = models.ManyToManyField(Tag, related_name="similar")
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def __unicode__(self):
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return self.name
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__test__ = {"regressions": """
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# Multiple m2m references to the same model or a different model must be
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# distinguished when accessing the relations through an instance attribute.
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>>> s1 = SelfRefer.objects.create(name='s1')
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>>> s2 = SelfRefer.objects.create(name='s2')
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>>> s3 = SelfRefer.objects.create(name='s3')
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>>> s1.references.add(s2)
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>>> s1.related.add(s3)
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>>> e1 = Entry.objects.create(name='e1')
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>>> t1 = Tag.objects.create(name='t1')
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>>> t2 = Tag.objects.create(name='t2')
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>>> e1.topics.add(t1)
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>>> e1.related.add(t2)
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>>> s1.references.all()
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[<SelfRefer: s2>]
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>>> s1.related.all()
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[<SelfRefer: s3>]
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>>> e1.topics.all()
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[<Tag: t1>]
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>>> e1.related.all()
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[<Tag: t2>]
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# The secret internal related names for self-referential many-to-many fields
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# shouldn't appear in the list when an error is made.
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>>> SelfRefer.objects.filter(porcupine='fred')
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Traceback (most recent call last):
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...
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FieldError: Cannot resolve keyword 'porcupine' into field. Choices are: id, name, references, related
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"""
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}
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