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