mirror of
https://github.com/django/django.git
synced 2024-12-01 15:42:04 +01:00
f399a804c9
When doing deeper than one level select_related() + only queries(), the
code introduced in b6c356b7bb errored
incorrectly.
Thanks to mrmachine for report & test case.
220 lines
8.4 KiB
Python
220 lines
8.4 KiB
Python
from __future__ import absolute_import
|
|
|
|
from operator import attrgetter
|
|
|
|
from django.contrib.contenttypes.models import ContentType
|
|
from django.contrib.sessions.backends.db import SessionStore
|
|
from django.db.models import Count
|
|
from django.db.models.loading import cache
|
|
from django.test import TestCase
|
|
|
|
from .models import (ResolveThis, Item, RelatedItem, Child, Leaf, Proxy,
|
|
SimpleItem, Feature, ItemAndSimpleItem, SpecialFeature)
|
|
|
|
|
|
class DeferRegressionTest(TestCase):
|
|
def test_basic(self):
|
|
# Deferred fields should really be deferred and not accidentally use
|
|
# the field's default value just because they aren't passed to __init__
|
|
|
|
Item.objects.create(name="first", value=42)
|
|
obj = Item.objects.only("name", "other_value").get(name="first")
|
|
# Accessing "name" doesn't trigger a new database query. Accessing
|
|
# "value" or "text" should.
|
|
with self.assertNumQueries(0):
|
|
self.assertEqual(obj.name, "first")
|
|
self.assertEqual(obj.other_value, 0)
|
|
|
|
with self.assertNumQueries(1):
|
|
self.assertEqual(obj.value, 42)
|
|
|
|
with self.assertNumQueries(1):
|
|
self.assertEqual(obj.text, "xyzzy")
|
|
|
|
with self.assertNumQueries(0):
|
|
self.assertEqual(obj.text, "xyzzy")
|
|
|
|
# Regression test for #10695. Make sure different instances don't
|
|
# inadvertently share data in the deferred descriptor objects.
|
|
i = Item.objects.create(name="no I'm first", value=37)
|
|
items = Item.objects.only("value").order_by("-value")
|
|
self.assertEqual(items[0].name, "first")
|
|
self.assertEqual(items[1].name, "no I'm first")
|
|
|
|
RelatedItem.objects.create(item=i)
|
|
r = RelatedItem.objects.defer("item").get()
|
|
self.assertEqual(r.item_id, i.id)
|
|
self.assertEqual(r.item, i)
|
|
|
|
# Some further checks for select_related() and inherited model
|
|
# behavior (regression for #10710).
|
|
c1 = Child.objects.create(name="c1", value=42)
|
|
c2 = Child.objects.create(name="c2", value=37)
|
|
Leaf.objects.create(name="l1", child=c1, second_child=c2)
|
|
|
|
obj = Leaf.objects.only("name", "child").select_related()[0]
|
|
self.assertEqual(obj.child.name, "c1")
|
|
|
|
self.assertQuerysetEqual(
|
|
Leaf.objects.select_related().only("child__name", "second_child__name"), [
|
|
"l1",
|
|
],
|
|
attrgetter("name")
|
|
)
|
|
|
|
# Models instances with deferred fields should still return the same
|
|
# content types as their non-deferred versions (bug #10738).
|
|
ctype = ContentType.objects.get_for_model
|
|
c1 = ctype(Item.objects.all()[0])
|
|
c2 = ctype(Item.objects.defer("name")[0])
|
|
c3 = ctype(Item.objects.only("name")[0])
|
|
self.assertTrue(c1 is c2 is c3)
|
|
|
|
# Regression for #10733 - only() can be used on a model with two
|
|
# foreign keys.
|
|
results = Leaf.objects.only("name", "child", "second_child").select_related()
|
|
self.assertEqual(results[0].child.name, "c1")
|
|
self.assertEqual(results[0].second_child.name, "c2")
|
|
|
|
results = Leaf.objects.only("name", "child", "second_child", "child__name", "second_child__name").select_related()
|
|
self.assertEqual(results[0].child.name, "c1")
|
|
self.assertEqual(results[0].second_child.name, "c2")
|
|
|
|
# Test for #12163 - Pickling error saving session with unsaved model
|
|
# instances.
|
|
SESSION_KEY = '2b1189a188b44ad18c35e1baac6ceead'
|
|
|
|
item = Item()
|
|
item._deferred = False
|
|
s = SessionStore(SESSION_KEY)
|
|
s.clear()
|
|
s["item"] = item
|
|
s.save()
|
|
|
|
s = SessionStore(SESSION_KEY)
|
|
s.modified = True
|
|
s.save()
|
|
|
|
i2 = s["item"]
|
|
self.assertFalse(i2._deferred)
|
|
|
|
# Regression for #11936 - loading.get_models should not return deferred
|
|
# models by default.
|
|
klasses = sorted(
|
|
cache.get_models(cache.get_app("defer_regress")),
|
|
key=lambda klass: klass.__name__
|
|
)
|
|
self.assertEqual(
|
|
klasses, [
|
|
Child,
|
|
Feature,
|
|
Item,
|
|
ItemAndSimpleItem,
|
|
Leaf,
|
|
Proxy,
|
|
RelatedItem,
|
|
ResolveThis,
|
|
SimpleItem,
|
|
SpecialFeature,
|
|
]
|
|
)
|
|
|
|
klasses = sorted(
|
|
map(
|
|
attrgetter("__name__"),
|
|
cache.get_models(
|
|
cache.get_app("defer_regress"), include_deferred=True
|
|
),
|
|
)
|
|
)
|
|
# FIXME: This is dependent on the order in which tests are run --
|
|
# this test case has to be the first, otherwise a LOT more classes
|
|
# appear.
|
|
self.assertEqual(
|
|
klasses, [
|
|
"Child",
|
|
"Child_Deferred_value",
|
|
"Feature",
|
|
"Item",
|
|
"ItemAndSimpleItem",
|
|
"Item_Deferred_name",
|
|
"Item_Deferred_name_other_value_text",
|
|
"Item_Deferred_name_other_value_value",
|
|
"Item_Deferred_other_value_text_value",
|
|
"Item_Deferred_text_value",
|
|
"Leaf",
|
|
"Leaf_Deferred_child_id_second_child_id_value",
|
|
"Leaf_Deferred_name_value",
|
|
"Leaf_Deferred_second_child_id_value",
|
|
"Leaf_Deferred_value",
|
|
"Proxy",
|
|
"RelatedItem",
|
|
"RelatedItem_Deferred_",
|
|
"RelatedItem_Deferred_item_id",
|
|
"ResolveThis",
|
|
"SimpleItem",
|
|
"SpecialFeature",
|
|
]
|
|
)
|
|
|
|
# Regression for #16409 - make sure defer() and only() work with annotate()
|
|
self.assertIsInstance(list(SimpleItem.objects.annotate(Count('feature')).defer('name')), list)
|
|
self.assertIsInstance(list(SimpleItem.objects.annotate(Count('feature')).only('name')), list)
|
|
|
|
def test_only_and_defer_usage_on_proxy_models(self):
|
|
# Regression for #15790 - only() broken for proxy models
|
|
proxy = Proxy.objects.create(name="proxy", value=42)
|
|
|
|
msg = 'QuerySet.only() return bogus results with proxy models'
|
|
dp = Proxy.objects.only('other_value').get(pk=proxy.pk)
|
|
self.assertEqual(dp.name, proxy.name, msg=msg)
|
|
self.assertEqual(dp.value, proxy.value, msg=msg)
|
|
|
|
# also test things with .defer()
|
|
msg = 'QuerySet.defer() return bogus results with proxy models'
|
|
dp = Proxy.objects.defer('name', 'text', 'value').get(pk=proxy.pk)
|
|
self.assertEqual(dp.name, proxy.name, msg=msg)
|
|
self.assertEqual(dp.value, proxy.value, msg=msg)
|
|
|
|
def test_resolve_columns(self):
|
|
rt = ResolveThis.objects.create(num=5.0, name='Foobar')
|
|
qs = ResolveThis.objects.defer('num')
|
|
self.assertEqual(1, qs.count())
|
|
self.assertEqual('Foobar', qs[0].name)
|
|
|
|
def test_defer_with_select_related(self):
|
|
item1 = Item.objects.create(name="first", value=47)
|
|
item2 = Item.objects.create(name="second", value=42)
|
|
simple = SimpleItem.objects.create(name="simple", value="23")
|
|
related = ItemAndSimpleItem.objects.create(item=item1, simple=simple)
|
|
|
|
obj = ItemAndSimpleItem.objects.defer('item').select_related('simple').get()
|
|
self.assertEqual(obj.item, item1)
|
|
self.assertEqual(obj.item_id, item1.id)
|
|
|
|
obj.item = item2
|
|
obj.save()
|
|
|
|
obj = ItemAndSimpleItem.objects.defer('item').select_related('simple').get()
|
|
self.assertEqual(obj.item, item2)
|
|
self.assertEqual(obj.item_id, item2.id)
|
|
|
|
def test_only_with_select_related(self):
|
|
# Test for #17485.
|
|
item = SimpleItem.objects.create(name='first', value=47)
|
|
feature = Feature.objects.create(item=item)
|
|
SpecialFeature.objects.create(feature=feature)
|
|
|
|
qs = Feature.objects.only('item__name').select_related('item')
|
|
self.assertEqual(len(qs), 1)
|
|
|
|
qs = SpecialFeature.objects.only('feature__item__name').select_related('feature__item')
|
|
self.assertEqual(len(qs), 1)
|
|
|
|
def test_deferred_class_factory(self):
|
|
from django.db.models.query_utils import deferred_class_factory
|
|
new_class = deferred_class_factory(Item,
|
|
('this_is_some_very_long_attribute_name_so_modelname_truncation_is_triggered',))
|
|
self.assertEqual(new_class.__name__,
|
|
'Item_Deferred_this_is_some_very_long_attribute_nac34b1f495507dad6b02e2cb235c875e')
|