mirror of
https://github.com/django/django.git
synced 2024-11-22 11:57:34 +01:00
68 lines
2.9 KiB
Python
68 lines
2.9 KiB
Python
from django.db.models import Q
|
|
from django.test import TestCase
|
|
|
|
from .models import Comment, Forum, Item, Post, PropertyValue, SystemDetails, SystemInfo
|
|
|
|
|
|
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.assertIsNone(Comment.objects.select_related().get(id=c2.id).post)
|
|
|
|
self.assertQuerySetEqual(
|
|
Comment.objects.select_related("post__forum__system_info").all(),
|
|
[
|
|
(c1.id, "My first comment", "<Post: First Post>"),
|
|
(c2.id, "My second comment", "None"),
|
|
],
|
|
transform=lambda c: (c.id, c.comment_text, repr(c.post)),
|
|
)
|
|
|
|
# Regression test for #7530, #7716.
|
|
self.assertIsNone(
|
|
Comment.objects.select_related("post").filter(post__isnull=True)[0].post
|
|
)
|
|
|
|
self.assertQuerySetEqual(
|
|
Comment.objects.select_related("post__forum__system_info__system_details"),
|
|
[
|
|
(c1.id, "My first comment", "<Post: First Post>"),
|
|
(c2.id, "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))
|