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Viewing changes to tests/modeltests/distinct_on_fields/tests.py

  • Committer: Package Import Robot
  • Author(s): Luke Faraone
  • Date: 2013-11-07 15:33:49 UTC
  • mfrom: (1.3.12)
  • Revision ID: package-import@ubuntu.com-20131107153349-e31sc149l2szs3jb
Tags: 1.6-1
http://bugs.debian.org/557474
http://bugs.debian.org/724637
http://bugs.debian.org/636511
http://bugs.debian.org/686333
http://bugs.debian.org/704203
* New upstream version. Closes: #557474, #724637.
* python-django now also suggests the installation of ipython,
  bpython, python-django-doc, and libgdal1.
  Closes: #636511, #686333, #704203
* Set package maintainer to Debian Python Modules Team.
* Bump standards version to 3.9.5, no changes needed.

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tests/modeltests/distinct_on_fields/tests.py
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from __future__ import absolute_import
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from django.db.models import Max
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from django.test import TestCase, skipUnlessDBFeature
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from django.test.utils import str_prefix
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from .models import Tag, Celebrity, Fan, Staff, StaffTag
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class DistinctOnTests(TestCase):
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    def setUp(self):
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        t1 = Tag.objects.create(name='t1')
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        t2 = Tag.objects.create(name='t2', parent=t1)
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        t3 = Tag.objects.create(name='t3', parent=t1)
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        t4 = Tag.objects.create(name='t4', parent=t3)
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        t5 = Tag.objects.create(name='t5', parent=t3)
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        p1_o1 = Staff.objects.create(id=1, name="p1", organisation="o1")
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        p2_o1 = Staff.objects.create(id=2, name="p2", organisation="o1")
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        p3_o1 = Staff.objects.create(id=3, name="p3", organisation="o1")
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        p1_o2 = Staff.objects.create(id=4, name="p1", organisation="o2")
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        p1_o1.coworkers.add(p2_o1, p3_o1)
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        StaffTag.objects.create(staff=p1_o1, tag=t1)
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        StaffTag.objects.create(staff=p1_o1, tag=t1)
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        celeb1 = Celebrity.objects.create(name="c1")
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        celeb2 = Celebrity.objects.create(name="c2")
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        self.fan1 = Fan.objects.create(fan_of=celeb1)
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        self.fan2 = Fan.objects.create(fan_of=celeb1)
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        self.fan3 = Fan.objects.create(fan_of=celeb2)
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    @skipUnlessDBFeature('can_distinct_on_fields')
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    def test_basic_distinct_on(self):
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        """QuerySet.distinct('field', ...) works"""
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        # (qset, expected) tuples
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        qsets = (
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            (
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                Staff.objects.distinct().order_by('name'),
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                ['<Staff: p1>', '<Staff: p1>', '<Staff: p2>', '<Staff: p3>'],
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            ),
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            (
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                Staff.objects.distinct('name').order_by('name'),
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                ['<Staff: p1>', '<Staff: p2>', '<Staff: p3>'],
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            ),
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            (
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                Staff.objects.distinct('organisation').order_by('organisation', 'name'),
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                ['<Staff: p1>', '<Staff: p1>'],
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            ),
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            (
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                Staff.objects.distinct('name', 'organisation').order_by('name', 'organisation'),
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                ['<Staff: p1>', '<Staff: p1>', '<Staff: p2>', '<Staff: p3>'],
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            ),
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            (
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                Celebrity.objects.filter(fan__in=[self.fan1, self.fan2, self.fan3]).\
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                    distinct('name').order_by('name'),
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                ['<Celebrity: c1>', '<Celebrity: c2>'],
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            ),
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            # Does combining querysets work?
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            (
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                (Celebrity.objects.filter(fan__in=[self.fan1, self.fan2]).\
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                    distinct('name').order_by('name')
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                |Celebrity.objects.filter(fan__in=[self.fan3]).\
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                    distinct('name').order_by('name')),
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                ['<Celebrity: c1>', '<Celebrity: c2>'],
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            ),
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            (
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                StaffTag.objects.distinct('staff','tag'),
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                ['<StaffTag: t1 -> p1>'],
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            ),
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            (
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                Tag.objects.order_by('parent__pk', 'pk').distinct('parent'),
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                ['<Tag: t2>', '<Tag: t4>', '<Tag: t1>'],
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            ),
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            (
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                StaffTag.objects.select_related('staff').distinct('staff__name').order_by('staff__name'),
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                ['<StaffTag: t1 -> p1>'],
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            ),
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            # Fetch the alphabetically first coworker for each worker
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            (
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                (Staff.objects.distinct('id').order_by('id', 'coworkers__name').
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                               values_list('id', 'coworkers__name')),
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                [str_prefix("(1, %(_)s'p2')"), str_prefix("(2, %(_)s'p1')"),
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                 str_prefix("(3, %(_)s'p1')"), "(4, None)"]
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            ),
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        )
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        for qset, expected in qsets:
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            self.assertQuerysetEqual(qset, expected)
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            self.assertEqual(qset.count(), len(expected))
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        # Combining queries with different distinct_fields is not allowed.
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        base_qs = Celebrity.objects.all()
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        self.assertRaisesMessage(
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            AssertionError,
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            "Cannot combine queries with different distinct fields.",
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            lambda: (base_qs.distinct('id') & base_qs.distinct('name'))
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        )
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        # Test join unreffing
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        c1 = Celebrity.objects.distinct('greatest_fan__id', 'greatest_fan__fan_of')
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        self.assertIn('OUTER JOIN', str(c1.query))
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        c2 = c1.distinct('pk')
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        self.assertNotIn('OUTER JOIN', str(c2.query))
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    @skipUnlessDBFeature('can_distinct_on_fields')
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    def test_distinct_not_implemented_checks(self):
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        # distinct + annotate not allowed
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        with self.assertRaises(NotImplementedError):
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            Celebrity.objects.annotate(Max('id')).distinct('id')[0]
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        with self.assertRaises(NotImplementedError):
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            Celebrity.objects.distinct('id').annotate(Max('id'))[0]
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        # However this check is done only when the query executes, so you
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        # can use distinct() to remove the fields before execution.
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        Celebrity.objects.distinct('id').annotate(Max('id')).distinct()[0]
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        # distinct + aggregate not allowed
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        with self.assertRaises(NotImplementedError):
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            Celebrity.objects.distinct('id').aggregate(Max('id'))
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