8662654d6d
Since the original ones in django.db.models.loading were kept only for backwards compatibility, there's no need to recreate them. However, many internals of Django still relied on them. They were also imported in django.db.models. They never appear in the documentation, except a quick mention of get_models and get_app in the 1.2 release notes to document an edge case in GIS. I don't think that makes them a public API. This commit doesn't change the overall amount of global state but clarifies that it's tied to the app_cache object instead of hiding it behind half a dozen functions.
262 lines
11 KiB
Python
262 lines
11 KiB
Python
from __future__ import unicode_literals
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from operator import attrgetter
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from django.apps import app_cache
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from django.contrib.contenttypes.models import ContentType
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from django.contrib.sessions.backends.db import SessionStore
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from django.db.models import Count
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from django.test import TestCase
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from django.test.utils import override_settings
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from .models import (
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ResolveThis, Item, RelatedItem, Child, Leaf, Proxy, SimpleItem, Feature,
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ItemAndSimpleItem, OneToOneItem, SpecialFeature, Location, Request)
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class DeferRegressionTest(TestCase):
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def test_basic(self):
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# Deferred fields should really be deferred and not accidentally use
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# the field's default value just because they aren't passed to __init__
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Item.objects.create(name="first", value=42)
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obj = Item.objects.only("name", "other_value").get(name="first")
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# Accessing "name" doesn't trigger a new database query. Accessing
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# "value" or "text" should.
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with self.assertNumQueries(0):
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self.assertEqual(obj.name, "first")
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self.assertEqual(obj.other_value, 0)
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with self.assertNumQueries(1):
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self.assertEqual(obj.value, 42)
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with self.assertNumQueries(1):
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self.assertEqual(obj.text, "xyzzy")
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with self.assertNumQueries(0):
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self.assertEqual(obj.text, "xyzzy")
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# Regression test for #10695. Make sure different instances don't
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# inadvertently share data in the deferred descriptor objects.
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i = Item.objects.create(name="no I'm first", value=37)
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items = Item.objects.only("value").order_by("-value")
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self.assertEqual(items[0].name, "first")
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self.assertEqual(items[1].name, "no I'm first")
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RelatedItem.objects.create(item=i)
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r = RelatedItem.objects.defer("item").get()
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self.assertEqual(r.item_id, i.id)
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self.assertEqual(r.item, i)
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# Some further checks for select_related() and inherited model
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# behavior (regression for #10710).
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c1 = Child.objects.create(name="c1", value=42)
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c2 = Child.objects.create(name="c2", value=37)
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Leaf.objects.create(name="l1", child=c1, second_child=c2)
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obj = Leaf.objects.only("name", "child").select_related()[0]
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self.assertEqual(obj.child.name, "c1")
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self.assertQuerysetEqual(
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Leaf.objects.select_related().only("child__name", "second_child__name"), [
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"l1",
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],
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attrgetter("name")
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)
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# Models instances with deferred fields should still return the same
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# content types as their non-deferred versions (bug #10738).
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ctype = ContentType.objects.get_for_model
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c1 = ctype(Item.objects.all()[0])
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c2 = ctype(Item.objects.defer("name")[0])
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c3 = ctype(Item.objects.only("name")[0])
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self.assertTrue(c1 is c2 is c3)
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# Regression for #10733 - only() can be used on a model with two
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# foreign keys.
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results = Leaf.objects.only("name", "child", "second_child").select_related()
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self.assertEqual(results[0].child.name, "c1")
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self.assertEqual(results[0].second_child.name, "c2")
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results = Leaf.objects.only(
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"name", "child", "second_child", "child__name", "second_child__name"
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).select_related()
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self.assertEqual(results[0].child.name, "c1")
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self.assertEqual(results[0].second_child.name, "c2")
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# Regression for #16409 - make sure defer() and only() work with annotate()
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self.assertIsInstance(
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list(SimpleItem.objects.annotate(Count('feature')).defer('name')),
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list)
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self.assertIsInstance(
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list(SimpleItem.objects.annotate(Count('feature')).only('name')),
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list)
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def test_ticket_11936(self):
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# Regression for #11936 - loading.get_models should not return deferred
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# models by default.
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# Run a couple of defer queries so that app-cache must contain some
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# deferred classes. It might contain a lot more classes depending on
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# the order the tests are ran.
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list(Item.objects.defer("name"))
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list(Child.objects.defer("value"))
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klasses = set(
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map(
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attrgetter("__name__"),
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app_cache.get_models(app_cache.get_app("defer_regress"))
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)
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)
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self.assertIn("Child", klasses)
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self.assertIn("Item", klasses)
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self.assertNotIn("Child_Deferred_value", klasses)
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self.assertNotIn("Item_Deferred_name", klasses)
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self.assertFalse(any(
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k._deferred for k in app_cache.get_models(app_cache.get_app("defer_regress"))))
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klasses_with_deferred = set(
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map(
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attrgetter("__name__"),
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app_cache.get_models(
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app_cache.get_app("defer_regress"), include_deferred=True
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),
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)
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)
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self.assertIn("Child", klasses_with_deferred)
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self.assertIn("Item", klasses_with_deferred)
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self.assertIn("Child_Deferred_value", klasses_with_deferred)
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self.assertIn("Item_Deferred_name", klasses_with_deferred)
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self.assertTrue(any(
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k._deferred for k in app_cache.get_models(
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app_cache.get_app("defer_regress"), include_deferred=True))
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)
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@override_settings(SESSION_SERIALIZER='django.contrib.sessions.serializers.PickleSerializer')
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def test_ticket_12163(self):
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# Test for #12163 - Pickling error saving session with unsaved model
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# instances.
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SESSION_KEY = '2b1189a188b44ad18c35e1baac6ceead'
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item = Item()
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item._deferred = False
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s = SessionStore(SESSION_KEY)
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s.clear()
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s["item"] = item
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s.save()
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s = SessionStore(SESSION_KEY)
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s.modified = True
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s.save()
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i2 = s["item"]
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self.assertFalse(i2._deferred)
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def test_ticket_16409(self):
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# Regression for #16409 - make sure defer() and only() work with annotate()
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self.assertIsInstance(
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list(SimpleItem.objects.annotate(Count('feature')).defer('name')),
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list)
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self.assertIsInstance(
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list(SimpleItem.objects.annotate(Count('feature')).only('name')),
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list)
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def test_only_and_defer_usage_on_proxy_models(self):
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# Regression for #15790 - only() broken for proxy models
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proxy = Proxy.objects.create(name="proxy", value=42)
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msg = 'QuerySet.only() return bogus results with proxy models'
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dp = Proxy.objects.only('other_value').get(pk=proxy.pk)
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self.assertEqual(dp.name, proxy.name, msg=msg)
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self.assertEqual(dp.value, proxy.value, msg=msg)
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# also test things with .defer()
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msg = 'QuerySet.defer() return bogus results with proxy models'
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dp = Proxy.objects.defer('name', 'text', 'value').get(pk=proxy.pk)
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self.assertEqual(dp.name, proxy.name, msg=msg)
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self.assertEqual(dp.value, proxy.value, msg=msg)
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def test_resolve_columns(self):
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ResolveThis.objects.create(num=5.0, name='Foobar')
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qs = ResolveThis.objects.defer('num')
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self.assertEqual(1, qs.count())
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self.assertEqual('Foobar', qs[0].name)
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def test_reverse_one_to_one_relations(self):
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# Refs #14694. Test reverse relations which are known unique (reverse
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# side has o2ofield or unique FK) - the o2o case
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item = Item.objects.create(name="first", value=42)
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o2o = OneToOneItem.objects.create(item=item, name="second")
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self.assertEqual(len(Item.objects.defer('one_to_one_item__name')), 1)
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self.assertEqual(len(Item.objects.select_related('one_to_one_item')), 1)
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self.assertEqual(len(Item.objects.select_related(
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'one_to_one_item').defer('one_to_one_item__name')), 1)
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self.assertEqual(len(Item.objects.select_related('one_to_one_item').defer('value')), 1)
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# Make sure that `only()` doesn't break when we pass in a unique relation,
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# rather than a field on the relation.
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self.assertEqual(len(Item.objects.only('one_to_one_item')), 1)
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with self.assertNumQueries(1):
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i = Item.objects.select_related('one_to_one_item')[0]
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self.assertEqual(i.one_to_one_item.pk, o2o.pk)
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self.assertEqual(i.one_to_one_item.name, "second")
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with self.assertNumQueries(1):
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i = Item.objects.select_related('one_to_one_item').defer(
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'value', 'one_to_one_item__name')[0]
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self.assertEqual(i.one_to_one_item.pk, o2o.pk)
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self.assertEqual(i.name, "first")
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with self.assertNumQueries(1):
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self.assertEqual(i.one_to_one_item.name, "second")
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with self.assertNumQueries(1):
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self.assertEqual(i.value, 42)
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def test_defer_with_select_related(self):
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item1 = Item.objects.create(name="first", value=47)
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item2 = Item.objects.create(name="second", value=42)
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simple = SimpleItem.objects.create(name="simple", value="23")
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ItemAndSimpleItem.objects.create(item=item1, simple=simple)
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obj = ItemAndSimpleItem.objects.defer('item').select_related('simple').get()
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self.assertEqual(obj.item, item1)
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self.assertEqual(obj.item_id, item1.id)
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obj.item = item2
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obj.save()
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obj = ItemAndSimpleItem.objects.defer('item').select_related('simple').get()
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self.assertEqual(obj.item, item2)
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self.assertEqual(obj.item_id, item2.id)
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def test_only_with_select_related(self):
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# Test for #17485.
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item = SimpleItem.objects.create(name='first', value=47)
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feature = Feature.objects.create(item=item)
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SpecialFeature.objects.create(feature=feature)
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qs = Feature.objects.only('item__name').select_related('item')
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self.assertEqual(len(qs), 1)
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qs = SpecialFeature.objects.only('feature__item__name').select_related('feature__item')
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self.assertEqual(len(qs), 1)
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def test_deferred_class_factory(self):
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from django.db.models.query_utils import deferred_class_factory
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new_class = deferred_class_factory(
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Item,
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('this_is_some_very_long_attribute_name_so_modelname_truncation_is_triggered',))
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self.assertEqual(
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new_class.__name__,
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'Item_Deferred_this_is_some_very_long_attribute_nac34b1f495507dad6b02e2cb235c875e')
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class DeferAnnotateSelectRelatedTest(TestCase):
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def test_defer_annotate_select_related(self):
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location = Location.objects.create()
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Request.objects.create(location=location)
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self.assertIsInstance(list(Request.objects
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.annotate(Count('items')).select_related('profile', 'location')
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.only('profile', 'location')), list)
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self.assertIsInstance(list(Request.objects
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.annotate(Count('items')).select_related('profile', 'location')
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.only('profile__profile1', 'location__location1')), list)
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self.assertIsInstance(list(Request.objects
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.annotate(Count('items')).select_related('profile', 'location')
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.defer('request1', 'request2', 'request3', 'request4')), list)
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