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import unittest
try:
set
except NameError:
from sets import Set as set
from django.db import DatabaseError, connection
from django.db.models import Count
from django.test import TestCase
from models import Tag, Annotation, DumbCategory
class QuerysetOrderedTests(unittest.TestCase):
"""
Tests for the Queryset.ordered attribute.
"""
def test_no_default_or_explicit_ordering(self):
self.assertEqual(Annotation.objects.all().ordered, False)
def test_cleared_default_ordering(self):
self.assertEqual(Tag.objects.all().ordered, True)
self.assertEqual(Tag.objects.all().order_by().ordered, False)
def test_explicit_ordering(self):
self.assertEqual(Annotation.objects.all().order_by('id').ordered, True)
def test_order_by_extra(self):
self.assertEqual(Annotation.objects.all().extra(order_by=['id']).ordered, True)
def test_annotated_ordering(self):
qs = Annotation.objects.annotate(num_notes=Count('notes'))
self.assertEqual(qs.ordered, False)
self.assertEqual(qs.order_by('num_notes').ordered, True)
class SubqueryTests(TestCase):
def setUp(self):
DumbCategory.objects.create(id=1)
DumbCategory.objects.create(id=2)
DumbCategory.objects.create(id=3)
def test_ordered_subselect(self):
"Subselects honor any manual ordering"
try:
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[0:2])
self.assertEquals(set(query.values_list('id', flat=True)), set([2,3]))
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[:2])
self.assertEquals(set(query.values_list('id', flat=True)), set([2,3]))
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[2:])
self.assertEquals(set(query.values_list('id', flat=True)), set([1]))
except DatabaseError:
# Oracle and MySQL both have problems with sliced subselects.
# This prevents us from even evaluating this test case at all.
# Refs #10099
self.assertFalse(connection.features.allow_sliced_subqueries)
def test_sliced_delete(self):
"Delete queries can safely contain sliced subqueries"
try:
DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[0:1]).delete()
self.assertEquals(set(DumbCategory.objects.values_list('id', flat=True)), set([1,2]))
except DatabaseError:
# Oracle and MySQL both have problems with sliced subselects.
# This prevents us from even evaluating this test case at all.
# Refs #10099
self.assertFalse(connection.features.allow_sliced_subqueries)
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