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103 lines
4.4 KiB
Python
103 lines
4.4 KiB
Python
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from django.db.models import F, IntegerField, Value
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from django.db.utils import DatabaseError
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from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
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from .models import Number, ReservedName
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@skipUnlessDBFeature('supports_select_union')
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class QuerySetSetOperationTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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Number.objects.bulk_create(Number(num=i) for i in range(10))
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def number_transform(self, value):
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return value.num
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def assertNumbersEqual(self, queryset, expected_numbers, ordered=True):
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self.assertQuerysetEqual(queryset, expected_numbers, self.number_transform, ordered)
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def test_simple_union(self):
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qs1 = Number.objects.filter(num__lte=1)
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qs2 = Number.objects.filter(num__gte=8)
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qs3 = Number.objects.filter(num=5)
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self.assertNumbersEqual(qs1.union(qs2, qs3), [0, 1, 5, 8, 9], ordered=False)
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@skipUnlessDBFeature('supports_select_intersection')
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def test_simple_intersection(self):
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qs1 = Number.objects.filter(num__lte=5)
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qs2 = Number.objects.filter(num__gte=5)
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qs3 = Number.objects.filter(num__gte=4, num__lte=6)
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self.assertNumbersEqual(qs1.intersection(qs2, qs3), [5], ordered=False)
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@skipUnlessDBFeature('supports_select_difference')
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def test_simple_difference(self):
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qs1 = Number.objects.filter(num__lte=5)
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qs2 = Number.objects.filter(num__lte=4)
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self.assertNumbersEqual(qs1.difference(qs2), [5], ordered=False)
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def test_union_distinct(self):
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qs1 = Number.objects.all()
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qs2 = Number.objects.all()
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self.assertEqual(len(list(qs1.union(qs2, all=True))), 20)
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self.assertEqual(len(list(qs1.union(qs2))), 10)
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def test_limits(self):
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qs1 = Number.objects.all()
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qs2 = Number.objects.all()
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self.assertEqual(len(list(qs1.union(qs2)[:2])), 2)
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def test_ordering(self):
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qs1 = Number.objects.filter(num__lte=1)
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qs2 = Number.objects.filter(num__gte=2, num__lte=3)
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self.assertNumbersEqual(qs1.union(qs2).order_by('-num'), [3, 2, 1, 0])
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@skipUnlessDBFeature('supports_slicing_ordering_in_compound')
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def test_ordering_subqueries(self):
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qs1 = Number.objects.order_by('num')[:2]
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qs2 = Number.objects.order_by('-num')[:2]
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self.assertNumbersEqual(qs1.union(qs2).order_by('-num')[:4], [9, 8, 1, 0])
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@skipIfDBFeature('supports_slicing_ordering_in_compound')
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def test_unsupported_ordering_slicing_raises_db_error(self):
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qs1 = Number.objects.all()
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qs2 = Number.objects.all()
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msg = 'LIMIT/OFFSET not allowed in subqueries of compound statements'
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with self.assertRaisesMessage(DatabaseError, msg):
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list(qs1.union(qs2[:10]))
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msg = 'ORDER BY not allowed in subqueries of compound statements'
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with self.assertRaisesMessage(DatabaseError, msg):
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list(qs1.order_by('id').union(qs2))
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@skipIfDBFeature('supports_select_intersection')
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def test_unsupported_intersection_raises_db_error(self):
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qs1 = Number.objects.all()
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qs2 = Number.objects.all()
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msg = 'intersection not supported on this database backend'
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with self.assertRaisesMessage(DatabaseError, msg):
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list(qs1.intersection(qs2))
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def test_combining_multiple_models(self):
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ReservedName.objects.create(name='99 little bugs', order=99)
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qs1 = Number.objects.filter(num=1).values_list('num', flat=True)
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qs2 = ReservedName.objects.values_list('order')
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self.assertEqual(list(qs1.union(qs2).order_by('num')), [1, 99])
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def test_order_raises_on_non_selected_column(self):
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qs1 = Number.objects.filter().annotate(
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annotation=Value(1, IntegerField()),
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).values('annotation', num2=F('num'))
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qs2 = Number.objects.filter().values('id', 'num')
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# Should not raise
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list(qs1.union(qs2).order_by('annotation'))
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list(qs1.union(qs2).order_by('num2'))
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msg = 'ORDER BY term does not match any column in the result set'
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# 'id' is not part of the select
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with self.assertRaisesMessage(DatabaseError, msg):
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list(qs1.union(qs2).order_by('id'))
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# 'num' got realiased to num2
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with self.assertRaisesMessage(DatabaseError, msg):
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list(qs1.union(qs2).order_by('num'))
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# switched order, now 'exists' again:
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list(qs2.union(qs1).order_by('num'))
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