mirror of https://github.com/django/django.git
55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
from django.db import models
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class Poll(models.Model):
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question = models.CharField(maxlength=200)
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def __str__(self):
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return "Q: %s " % self.question
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class Choice(models.Model):
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poll = models.ForeignKey(Poll)
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choice = models.CharField(maxlength=200)
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def __str__(self):
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return "Choice: %s in poll %s" % (self.choice, self.poll)
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__test__ = {'API_TESTS':"""
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# Regression test for the use of None as a query value. None is interpreted as
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# an SQL NULL, but only in __exact queries.
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# Set up some initial polls and choices
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>>> p1 = Poll(question='Why?')
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>>> p1.save()
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>>> c1 = Choice(poll=p1, choice='Because.')
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>>> c1.save()
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>>> c2 = Choice(poll=p1, choice='Why Not?')
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>>> c2.save()
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# Exact query with value None returns nothing (=NULL in sql)
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>>> Choice.objects.filter(id__exact=None)
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[]
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# Valid query, but fails because foo isn't a keyword
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>>> Choice.objects.filter(foo__exact=None)
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Traceback (most recent call last):
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...
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TypeError: Cannot resolve keyword 'foo' into field
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# Can't use None on anything other than __exact
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>>> Choice.objects.filter(id__gt=None)
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Traceback (most recent call last):
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...
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ValueError: Cannot use None as a query value
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# Can't use None on anything other than __exact
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>>> Choice.objects.filter(foo__gt=None)
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Traceback (most recent call last):
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...
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ValueError: Cannot use None as a query value
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# Related managers use __exact=None implicitly if the object hasn't been saved.
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>>> p2 = Poll(question="How?")
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>>> p2.choice_set.all()
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[]
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"""}
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