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9c52d56f6f
This is a big internal change, but mostly backwards compatible with existing code. Also adds a couple of new features. Fixed #245, #1050, #1656, #1801, #2076, #2091, #2150, #2253, #2306, #2400, #2430, #2482, #2496, #2676, #2737, #2874, #2902, #2939, #3037, #3141, #3288, #3440, #3592, #3739, #4088, #4260, #4289, #4306, #4358, #4464, #4510, #4858, #5012, #5020, #5261, #5295, #5321, #5324, #5325, #5555, #5707, #5796, #5817, #5987, #6018, #6074, #6088, #6154, #6177, #6180, #6203, #6658 git-svn-id: http://code.djangoproject.com/svn/django/trunk@7477 bcc190cf-cafb-0310-a4f2-bffc1f526a37
60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
from django.db import models
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class Poll(models.Model):
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question = models.CharField(max_length=200)
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def __unicode__(self):
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return u"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(max_length=200)
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def __unicode__(self):
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return u"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 ("is NULL" in sql, but every 'id'
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# field has a value).
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>>> Choice.objects.filter(choice__exact=None)
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[]
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Excluding the previous result returns everything.
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>>> Choice.objects.exclude(choice=None).order_by('id')
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[<Choice: Choice: Because. in poll Q: Why? >, <Choice: Choice: Why Not? in poll Q: Why? >]
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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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FieldError: Cannot resolve keyword 'foo' into field. Choices are: choice, id, poll
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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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