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59 lines
1.7 KiB
59 lines
1.7 KiB
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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