104 lines
4.1 KiB
Python
104 lines
4.1 KiB
Python
from django.db import DatabaseError, connections, DEFAULT_DB_ALIAS
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from django.db.models import Count
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from django.test import TestCase
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from django.utils import unittest
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from models import Tag, Annotation, DumbCategory, Note, ExtraInfo, Number
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class QuerysetOrderedTests(unittest.TestCase):
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"""
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Tests for the Queryset.ordered attribute.
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"""
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def test_no_default_or_explicit_ordering(self):
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self.assertEqual(Annotation.objects.all().ordered, False)
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def test_cleared_default_ordering(self):
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self.assertEqual(Tag.objects.all().ordered, True)
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self.assertEqual(Tag.objects.all().order_by().ordered, False)
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def test_explicit_ordering(self):
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self.assertEqual(Annotation.objects.all().order_by('id').ordered, True)
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def test_order_by_extra(self):
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self.assertEqual(Annotation.objects.all().extra(order_by=['id']).ordered, True)
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def test_annotated_ordering(self):
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qs = Annotation.objects.annotate(num_notes=Count('notes'))
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self.assertEqual(qs.ordered, False)
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self.assertEqual(qs.order_by('num_notes').ordered, True)
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class SubqueryTests(TestCase):
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def setUp(self):
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DumbCategory.objects.create(id=1)
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DumbCategory.objects.create(id=2)
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DumbCategory.objects.create(id=3)
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def test_ordered_subselect(self):
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"Subselects honor any manual ordering"
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try:
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query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[0:2])
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self.assertEquals(set(query.values_list('id', flat=True)), set([2,3]))
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query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[:2])
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self.assertEquals(set(query.values_list('id', flat=True)), set([2,3]))
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query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[2:])
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self.assertEquals(set(query.values_list('id', flat=True)), set([1]))
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except DatabaseError:
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# Oracle and MySQL both have problems with sliced subselects.
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# This prevents us from even evaluating this test case at all.
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# Refs #10099
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self.assertFalse(connections[DEFAULT_DB_ALIAS].features.allow_sliced_subqueries)
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def test_sliced_delete(self):
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"Delete queries can safely contain sliced subqueries"
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try:
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DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[0:1]).delete()
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self.assertEquals(set(DumbCategory.objects.values_list('id', flat=True)), set([1,2]))
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except DatabaseError:
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# Oracle and MySQL both have problems with sliced subselects.
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# This prevents us from even evaluating this test case at all.
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# Refs #10099
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self.assertFalse(connections[DEFAULT_DB_ALIAS].features.allow_sliced_subqueries)
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class CloneTests(TestCase):
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def test_evaluated_queryset_as_argument(self):
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"#13227 -- If a queryset is already evaluated, it can still be used as a query arg"
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n = Note(note='Test1', misc='misc')
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n.save()
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e = ExtraInfo(info='good', note=n)
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e.save()
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n_list = Note.objects.all()
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# Evaluate the Note queryset, populating the query cache
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list(n_list)
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# Use the note queryset in a query, and evalute
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# that query in a way that involves cloning.
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try:
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self.assertEquals(ExtraInfo.objects.filter(note__in=n_list)[0].info, 'good')
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except:
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self.fail('Query should be clonable')
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class EmptyQuerySetTests(TestCase):
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def test_emptyqueryset_values(self):
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"#14366 -- calling .values() on an EmptyQuerySet and then cloning that should not cause an error"
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self.assertEqual(list(Number.objects.none().values('num').order_by('num')), [])
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def test_values_subquery(self):
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self.assertQuerysetEqual(
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Number.objects.filter(pk__in=Number.objects.none().values("pk")), []
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)
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class WeirdQuerySetSlicing(TestCase):
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def setUp(self):
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Number.objects.create(num=1)
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Number.objects.create(num=2)
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def test_empty_resultset_sql(self):
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# ticket #12192
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self.assertNumQueries(0, lambda: list(Number.objects.all()[1:1]))
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