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76 lines
2.8 KiB
Python
76 lines
2.8 KiB
Python
from django.core.exceptions import FieldError
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from django.test import TestCase
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from .models import Choice, Inner, OuterA, OuterB, Poll
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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 and __iexact
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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.assertSequenceEqual(Choice.objects.filter(choice__exact=None), [])
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# The same behavior for iexact query.
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self.assertSequenceEqual(Choice.objects.filter(choice__iexact=None), [])
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# Excluding the previous result returns everything.
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self.assertSequenceEqual(
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Choice.objects.exclude(choice=None).order_by("id"), [c1, c2]
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)
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# Valid query, but fails because foo isn't a keyword
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msg = (
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"Cannot resolve keyword 'foo' into field. Choices are: choice, id, poll, "
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"poll_id"
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)
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with self.assertRaisesMessage(FieldError, msg):
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Choice.objects.filter(foo__exact=None)
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# Can't use None on anything other than __exact and __iexact
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with self.assertRaisesMessage(ValueError, "Cannot use None as a query value"):
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Choice.objects.filter(id__gt=None)
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def test_unsaved(self):
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poll = Poll(question="How?")
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msg = (
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"'Poll' instance needs to have a primary key value before this "
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"relationship can be used."
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)
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with self.assertRaisesMessage(ValueError, msg):
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poll.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.assertSequenceEqual(OuterA.objects.filter(inner__third=None), [obj])
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self.assertSequenceEqual(OuterA.objects.filter(inner__third__data=None), [obj])
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inner = Inner.objects.create(first=obj)
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self.assertSequenceEqual(
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Inner.objects.filter(first__inner__third=None), [inner]
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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 = OuterB.objects.create(data="reverse")
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self.assertSequenceEqual(OuterB.objects.filter(inner__isnull=False), [])
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Inner.objects.create(first=obj)
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self.assertSequenceEqual(OuterB.objects.exclude(inner__isnull=False), [outerb])
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