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from django.core.exceptions import FieldError
from django.test import TestCase
from .models import Choice, Inner, OuterA, OuterB, Poll
class NullQueriesTests(TestCase):
def test_none_as_null(self):
"""
Regression test for the use of None as a query value.
None is interpreted as an SQL NULL, but only in __exact and __iexact
queries.
Set up some initial polls and choices
"""
p1 = Poll(question="Why?")
p1.save()
c1 = Choice(poll=p1, choice="Because.")
c1.save()
c2 = Choice(poll=p1, choice="Why Not?")
c2.save()
# Exact query with value None returns nothing ("is NULL" in sql,
# but every 'id' field has a value).
self.assertSequenceEqual(Choice.objects.filter(choice__exact=None), [])
# The same behavior for iexact query.
self.assertSequenceEqual(Choice.objects.filter(choice__iexact=None), [])
# Excluding the previous result returns everything.
self.assertSequenceEqual(
Choice.objects.exclude(choice=None).order_by("id"), [c1, c2]
)
# Valid query, but fails because foo isn't a keyword
msg = (
"Cannot resolve keyword 'foo' into field. Choices are: choice, id, poll, "
"poll_id"
)
with self.assertRaisesMessage(FieldError, msg):
Choice.objects.filter(foo__exact=None)
# Can't use None on anything other than __exact and __iexact
with self.assertRaisesMessage(ValueError, "Cannot use None as a query value"):
Choice.objects.filter(id__gt=None)
def test_unsaved(self):
poll = Poll(question="How?")
msg = (
"'Poll' instance needs to have a primary key value before this "
"relationship can be used."
)
with self.assertRaisesMessage(ValueError, msg):
poll.choice_set.all()
def test_reverse_relations(self):
"""
Querying across reverse relations and then another relation should
insert outer joins correctly so as not to exclude results.
"""
obj = OuterA.objects.create()
self.assertSequenceEqual(OuterA.objects.filter(inner__third=None), [obj])
self.assertSequenceEqual(OuterA.objects.filter(inner__third__data=None), [obj])
inner = Inner.objects.create(first=obj)
self.assertSequenceEqual(
Inner.objects.filter(first__inner__third=None), [inner]
)
# Ticket #13815: check if <reverse>_isnull=False does not produce
# faulty empty lists
outerb = OuterB.objects.create(data="reverse")
self.assertSequenceEqual(OuterB.objects.filter(inner__isnull=False), [])
Inner.objects.create(first=obj)
self.assertSequenceEqual(OuterB.objects.exclude(inner__isnull=False), [outerb])
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