mirror of https://github.com/django/django.git
70 lines
2.9 KiB
Python
70 lines
2.9 KiB
Python
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from __future__ import absolute_import, unicode_literals
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from django.db.models import Q
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from django.test import TestCase
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from .models import (SystemDetails, Item, PropertyValue, SystemInfo, Forum,
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Post, Comment)
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class NullFkTests(TestCase):
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def test_null_fk(self):
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d = SystemDetails.objects.create(details='First details')
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s = SystemInfo.objects.create(system_name='First forum', system_details=d)
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f = Forum.objects.create(system_info=s, forum_name='First forum')
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p = Post.objects.create(forum=f, title='First Post')
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c1 = Comment.objects.create(post=p, comment_text='My first comment')
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c2 = Comment.objects.create(comment_text='My second comment')
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# Starting from comment, make sure that a .select_related(...) with a specified
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# set of fields will properly LEFT JOIN multiple levels of NULLs (and the things
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# that come after the NULLs, or else data that should exist won't). Regression
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# test for #7369.
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c = Comment.objects.select_related().get(id=c1.id)
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self.assertEqual(c.post, p)
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self.assertEqual(Comment.objects.select_related().get(id=c2.id).post, None)
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self.assertQuerysetEqual(
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Comment.objects.select_related('post__forum__system_info').all(),
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[
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(c1.id, 'My first comment', '<Post: First Post>'),
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(c2.id, 'My second comment', 'None')
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],
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transform = lambda c: (c.id, c.comment_text, repr(c.post))
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)
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# Regression test for #7530, #7716.
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self.assertTrue(Comment.objects.select_related('post').filter(post__isnull=True)[0].post is None)
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self.assertQuerysetEqual(
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Comment.objects.select_related('post__forum__system_info__system_details'),
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[
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(c1.id, 'My first comment', '<Post: First Post>'),
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(c2.id, 'My second comment', 'None')
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],
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transform = lambda c: (c.id, c.comment_text, repr(c.post))
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)
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def test_combine_isnull(self):
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item = Item.objects.create(title='Some Item')
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pv = PropertyValue.objects.create(label='Some Value')
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item.props.create(key='a', value=pv)
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item.props.create(key='b') # value=NULL
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q1 = Q(props__key='a', props__value=pv)
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q2 = Q(props__key='b', props__value__isnull=True)
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# Each of these individually should return the item.
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self.assertEqual(Item.objects.get(q1), item)
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self.assertEqual(Item.objects.get(q2), item)
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# Logically, qs1 and qs2, and qs3 and qs4 should be the same.
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qs1 = Item.objects.filter(q1) & Item.objects.filter(q2)
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qs2 = Item.objects.filter(q2) & Item.objects.filter(q1)
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qs3 = Item.objects.filter(q1) | Item.objects.filter(q2)
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qs4 = Item.objects.filter(q2) | Item.objects.filter(q1)
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# Regression test for #15823.
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self.assertEqual(list(qs1), list(qs2))
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self.assertEqual(list(qs3), list(qs4))
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