84 lines
2.8 KiB
Python
84 lines
2.8 KiB
Python
from __future__ import unicode_literals
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from django.test import TestCase
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from django.core.exceptions import FieldError
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from .models import Poll, Choice, OuterA, Inner, OuterB
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class NullQueriesTests(TestCase):
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def test_none_as_null(self):
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"""
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Regression test for the use of None as a query value.
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None is interpreted as an SQL NULL, but only in __exact queries.
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Set up some initial polls and choices
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"""
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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,
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# but every 'id' field has a value).
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self.assertQuerysetEqual(Choice.objects.filter(choice__exact=None), [])
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# Excluding the previous result returns everything.
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self.assertQuerysetEqual(
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Choice.objects.exclude(choice=None).order_by('id'),
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[
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'<Choice: Choice: Because. in poll Q: Why? >',
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'<Choice: Choice: Why Not? in poll Q: Why? >'
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]
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)
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# Valid query, but fails because foo isn't a keyword
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self.assertRaises(FieldError, Choice.objects.filter, foo__exact=None)
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# Can't use None on anything other than __exact
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self.assertRaises(ValueError, Choice.objects.filter, id__gt=None)
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# Can't use None on anything other than __exact
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self.assertRaises(ValueError, Choice.objects.filter, foo__gt=None)
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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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self.assertEqual(repr(p2.choice_set.all()), '[]')
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def test_reverse_relations(self):
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"""
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Querying across reverse relations and then another relation should
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insert outer joins correctly so as not to exclude results.
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"""
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obj = OuterA.objects.create()
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self.assertQuerysetEqual(
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OuterA.objects.filter(inner__third=None),
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['<OuterA: OuterA object>']
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)
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self.assertQuerysetEqual(
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OuterA.objects.filter(inner__third__data=None),
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['<OuterA: OuterA object>']
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)
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Inner.objects.create(first=obj)
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self.assertQuerysetEqual(
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Inner.objects.filter(first__inner__third=None),
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['<Inner: Inner object>']
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)
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# Ticket #13815: check if <reverse>_isnull=False does not produce
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# faulty empty lists
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OuterB.objects.create(data="reverse")
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self.assertQuerysetEqual(
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OuterB.objects.filter(inner__isnull=False),
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[]
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)
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Inner.objects.create(first=obj)
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self.assertQuerysetEqual(
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OuterB.objects.exclude(inner__isnull=False),
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['<OuterB: OuterB object>']
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)
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