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from django.contrib.contenttypes.models import ContentType, ContentTypeManager
from django.db import models
from django.test import TestCase, override_settings
from django.test.utils import isolate_apps
from .models import Author, ConcreteModel, FooWithUrl, ProxyModel
class ContentTypesTests(TestCase):
def setUp(self):
ContentType.objects.clear_cache()
def tearDown(self):
ContentType.objects.clear_cache()
def test_lookup_cache(self):
"""
The content type cache (see ContentTypeManager) works correctly.
Lookups for a particular content type -- by model, ID, or natural key
-- should hit the database only on the first lookup.
"""
# At this point, a lookup for a ContentType should hit the DB
with self.assertNumQueries(1):
ContentType.objects.get_for_model(ContentType)
# A second hit, though, won't hit the DB, nor will a lookup by ID
# or natural key
with self.assertNumQueries(0):
ct = ContentType.objects.get_for_model(ContentType)
with self.assertNumQueries(0):
ContentType.objects.get_for_id(ct.id)
with self.assertNumQueries(0):
ContentType.objects.get_by_natural_key('contenttypes', 'contenttype')
# Once we clear the cache, another lookup will again hit the DB
ContentType.objects.clear_cache()
with self.assertNumQueries(1):
ContentType.objects.get_for_model(ContentType)
# The same should happen with a lookup by natural key
ContentType.objects.clear_cache()
with self.assertNumQueries(1):
ContentType.objects.get_by_natural_key('contenttypes', 'contenttype')
# And a second hit shouldn't hit the DB
with self.assertNumQueries(0):
ContentType.objects.get_by_natural_key('contenttypes', 'contenttype')
def test_get_for_models_creation(self):
ContentType.objects.all().delete()
with self.assertNumQueries(4):
cts = ContentType.objects.get_for_models(ContentType, FooWithUrl, ProxyModel, ConcreteModel)
self.assertEqual(cts, {
ContentType: ContentType.objects.get_for_model(ContentType),
FooWithUrl: ContentType.objects.get_for_model(FooWithUrl),
ProxyModel: ContentType.objects.get_for_model(ProxyModel),
ConcreteModel: ContentType.objects.get_for_model(ConcreteModel),
})
def test_get_for_models_empty_cache(self):
# Empty cache.
with self.assertNumQueries(1):
cts = ContentType.objects.get_for_models(ContentType, FooWithUrl, ProxyModel, ConcreteModel)
self.assertEqual(cts, {
ContentType: ContentType.objects.get_for_model(ContentType),
FooWithUrl: ContentType.objects.get_for_model(FooWithUrl),
ProxyModel: ContentType.objects.get_for_model(ProxyModel),
ConcreteModel: ContentType.objects.get_for_model(ConcreteModel),
})
def test_get_for_models_partial_cache(self):
# Partial cache
ContentType.objects.get_for_model(ContentType)
with self.assertNumQueries(1):
cts = ContentType.objects.get_for_models(ContentType, FooWithUrl)
self.assertEqual(cts, {
ContentType: ContentType.objects.get_for_model(ContentType),
FooWithUrl: ContentType.objects.get_for_model(FooWithUrl),
})
def test_get_for_models_full_cache(self):
# Full cache
ContentType.objects.get_for_model(ContentType)
ContentType.objects.get_for_model(FooWithUrl)
with self.assertNumQueries(0):
cts = ContentType.objects.get_for_models(ContentType, FooWithUrl)
self.assertEqual(cts, {
ContentType: ContentType.objects.get_for_model(ContentType),
FooWithUrl: ContentType.objects.get_for_model(FooWithUrl),
})
@isolate_apps('contenttypes_tests')
def test_get_for_model_create_contenttype(self):
"""
ContentTypeManager.get_for_model() creates the corresponding content
type if it doesn't exist in the database.
"""
class ModelCreatedOnTheFly(models.Model):
name = models.CharField()
ct = ContentType.objects.get_for_model(ModelCreatedOnTheFly)
self.assertEqual(ct.app_label, 'contenttypes_tests')
self.assertEqual(ct.model, 'modelcreatedonthefly')
self.assertEqual(str(ct), 'modelcreatedonthefly')
def test_get_for_concrete_model(self):
"""
Make sure the `for_concrete_model` kwarg correctly works
with concrete, proxy and deferred models
"""
concrete_model_ct = ContentType.objects.get_for_model(ConcreteModel)
self.assertEqual(concrete_model_ct, ContentType.objects.get_for_model(ProxyModel))
self.assertEqual(concrete_model_ct, ContentType.objects.get_for_model(ConcreteModel, for_concrete_model=False))
proxy_model_ct = ContentType.objects.get_for_model(ProxyModel, for_concrete_model=False)
self.assertNotEqual(concrete_model_ct, proxy_model_ct)
# Make sure deferred model are correctly handled
ConcreteModel.objects.create(name="Concrete")
DeferredConcreteModel = ConcreteModel.objects.only('pk').get().__class__
DeferredProxyModel = ProxyModel.objects.only('pk').get().__class__
self.assertEqual(concrete_model_ct, ContentType.objects.get_for_model(DeferredConcreteModel))
self.assertEqual(
concrete_model_ct,
ContentType.objects.get_for_model(DeferredConcreteModel, for_concrete_model=False)
)
self.assertEqual(concrete_model_ct, ContentType.objects.get_for_model(DeferredProxyModel))
self.assertEqual(
proxy_model_ct,
ContentType.objects.get_for_model(DeferredProxyModel, for_concrete_model=False)
)
def test_get_for_concrete_models(self):
"""
Make sure the `for_concrete_models` kwarg correctly works
with concrete, proxy and deferred models.
"""
concrete_model_ct = ContentType.objects.get_for_model(ConcreteModel)
cts = ContentType.objects.get_for_models(ConcreteModel, ProxyModel)
self.assertEqual(cts, {
ConcreteModel: concrete_model_ct,
ProxyModel: concrete_model_ct,
})
proxy_model_ct = ContentType.objects.get_for_model(ProxyModel, for_concrete_model=False)
cts = ContentType.objects.get_for_models(ConcreteModel, ProxyModel, for_concrete_models=False)
self.assertEqual(cts, {
ConcreteModel: concrete_model_ct,
ProxyModel: proxy_model_ct,
})
# Make sure deferred model are correctly handled
ConcreteModel.objects.create(name="Concrete")
DeferredConcreteModel = ConcreteModel.objects.only('pk').get().__class__
DeferredProxyModel = ProxyModel.objects.only('pk').get().__class__
cts = ContentType.objects.get_for_models(DeferredConcreteModel, DeferredProxyModel)
self.assertEqual(cts, {
DeferredConcreteModel: concrete_model_ct,
DeferredProxyModel: concrete_model_ct,
})
cts = ContentType.objects.get_for_models(
DeferredConcreteModel, DeferredProxyModel, for_concrete_models=False
)
self.assertEqual(cts, {
DeferredConcreteModel: concrete_model_ct,
DeferredProxyModel: proxy_model_ct,
})
def test_cache_not_shared_between_managers(self):
with self.assertNumQueries(1):
ContentType.objects.get_for_model(ContentType)
with self.assertNumQueries(0):
ContentType.objects.get_for_model(ContentType)
other_manager = ContentTypeManager()
other_manager.model = ContentType
with self.assertNumQueries(1):
other_manager.get_for_model(ContentType)
with self.assertNumQueries(0):
other_manager.get_for_model(ContentType)
def test_missing_model(self):
"""
Displaying content types in admin (or anywhere) doesn't break on
leftover content type records in the DB for which no model is defined
anymore.
"""
ct = ContentType.objects.create(
app_label='contenttypes',
model='OldModel',
)
self.assertEqual(str(ct), 'OldModel')
self.assertIsNone(ct.model_class())
# Stale ContentTypes can be fetched like any other object.
ct_fetched = ContentType.objects.get_for_id(ct.pk)
self.assertIsNone(ct_fetched.model_class())
def test_str(self):
ct = ContentType.objects.get(app_label='contenttypes_tests', model='site')
self.assertEqual(str(ct), 'contenttypes_tests | site')
def test_app_labeled_name(self):
ct = ContentType.objects.get(app_label='contenttypes_tests', model='site')
self.assertEqual(ct.app_labeled_name, 'contenttypes_tests | site')
def test_app_labeled_name_unknown_model(self):
ct = ContentType(app_label='contenttypes_tests', model='unknown')
self.assertEqual(ct.app_labeled_name, 'unknown')
class TestRouter:
def db_for_read(self, model, **hints):
return 'other'
def db_for_write(self, model, **hints):
return 'default'
@override_settings(DATABASE_ROUTERS=[TestRouter()])
class ContentTypesMultidbTests(TestCase):
databases = {'default', 'other'}
def test_multidb(self):
"""
When using multiple databases, ContentType.objects.get_for_model() uses
db_for_read().
"""
ContentType.objects.clear_cache()
with self.assertNumQueries(0, using='default'), self.assertNumQueries(1, using='other'):
ContentType.objects.get_for_model(Author)
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