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tests.py
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tests.py
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from django.contrib.contenttypes.models import ContentType
from django.test import TestCase
from genericm2m.models import RelatedObject, RelatedObjectsDescriptor, GFKOptimizedQuerySet
from genericm2m.genericm2m_tests.models import (
Food, Beverage, Person, RelatedBeverage, Boring, AnotherRelatedObject, Note
)
class RelationsTestCase(TestCase):
def setUp(self):
self.pizza = Food.objects.create(name='pizza')
self.sandwich = Food.objects.create(name='sandwich')
self.cereal = Food.objects.create(name='cereal')
self.soda = Beverage.objects.create(name='soda')
self.beer = Beverage.objects.create(name='beer')
self.milk = Beverage.objects.create(name='milk')
self.mario = Person.objects.create(name='mario')
self.sam = Person.objects.create(name='sam')
self.chocula = Person.objects.create(name='chocula')
self.table = Boring.objects.create(name='table')
self.chair = Boring.objects.create(name='chair')
def assertRelatedEqual(self, rel_qs, tups, from_field='parent',
to_field='object'):
rel_tup = [
(getattr(rel_obj, from_field), getattr(rel_obj, to_field)) \
for rel_obj in rel_qs
]
self.assertEqual(rel_tup, list(tups))
def test_connect(self):
"""
Connect model instances to various other model instances, then query
the manager and check the queryset returned is correct
"""
self.pizza.related.connect(self.soda)
self.pizza.related.connect(self.beer)
self.pizza.related.connect(self.mario)
self.soda.related.connect(self.pizza)
self.soda.related.connect(self.beer)
related = self.pizza.related.all()
self.assertRelatedEqual(related, (
(self.pizza, self.mario),
(self.pizza, self.beer),
(self.pizza, self.soda),
))
self.sandwich.related.connect(self.soda)
self.sandwich.related.connect(self.milk)
related = self.sandwich.related.all()
self.assertRelatedEqual(related, (
(self.sandwich, self.milk),
(self.sandwich, self.soda),
))
related = self.cereal.related.all()
self.assertRelatedEqual(related, ())
related = self.soda.related.all()
self.assertRelatedEqual(related, (
(self.soda, self.beer),
(self.soda, self.pizza),
))
self.sandwich.related.connect(self.table)
related = self.sandwich.related.all()
self.assertRelatedEqual(related, (
(self.sandwich, self.table),
(self.sandwich, self.milk),
(self.sandwich, self.soda),
))
def test_related_to(self):
"""
Check the back-side of the double-GFK, note: this only works on objects
that have a RelatedObjectsDescriptor() pointing to the same model
class, in this case the default `RelatedObject`
"""
self.pizza.related.connect(self.soda)
self.pizza.related.connect(self.beer)
self.pizza.related.connect(self.table)
self.sandwich.related.connect(self.soda)
self.sandwich.related.connect(self.milk)
self.mario.related.connect(self.soda)
self.soda.related.connect(self.pizza)
related = self.soda.related.related_to()
self.assertRelatedEqual(related, (
(self.mario, self.soda),
(self.sandwich, self.soda),
(self.pizza, self.soda),
))
related = self.beer.related.related_to()
self.assertRelatedEqual(related, (
(self.pizza, self.beer),
))
related = self.milk.related.related_to()
self.assertRelatedEqual(related, (
(self.sandwich, self.milk),
))
related = self.pizza.related.related_to()
self.assertRelatedEqual(related, (
(self.soda, self.pizza),
))
def test_symmetrical(self):
self.pizza.related.connect(self.soda)
self.pizza.related.connect(self.beer)
self.pizza.related.connect(self.table)
self.sandwich.related.connect(self.soda)
self.sandwich.related.connect(self.milk)
self.mario.related.connect(self.soda)
self.soda.related.connect(self.pizza)
related = self.soda.related.symmetrical().order_by('id')
self.assertRelatedEqual(related, (
(self.pizza, self.soda),
(self.sandwich, self.soda),
(self.mario, self.soda),
(self.soda, self.pizza),
))
related = self.beer.related.symmetrical()
self.assertRelatedEqual(related, (
(self.pizza, self.beer),
))
def test_manager_methods(self):
"""
Since the RelatedObjectsDescriptor behaves like a dynamic manager (much
the same as Django's ForeignRelatedObjectsDescriptor) test to ensure
that the manager behaves as expected and correctly implements all the
basic FK methods
"""
# connect pizza to soda and grab the newly-created RelatedObject
self.pizza.related.connect(self.soda)
rel_obj = RelatedObject.objects.all()[0]
# connect cereal to milk (this is just to make sure that anything
# modified on one Food object doesn't affect another Food object
self.cereal.related.connect(self.milk)
# create a new RelatedObject but do not save it yet -- note that it does
# not have `parent_object` set
new_rel_obj = RelatedObject(object=self.beer)
# add this related object to pizza, parent_object gets set and it will
# show up in the queryset as expected
self.pizza.related.add(new_rel_obj)
self.assertRelatedEqual(self.pizza.related.all(), (
(self.pizza, self.beer),
(self.pizza, self.soda),
))
# remove the original RelatedObject `rel_obj`, which was the connection
# from pizza -> soda
self.pizza.related.remove(rel_obj)
self.assertRelatedEqual(self.pizza.related.all(), (
(self.pizza, self.beer),
))
# make sure clearing pizza's related queryset works
self.pizza.related.clear()
self.assertRelatedEqual(self.pizza.related.all(), ())
# make sure clearing the pizza objects didn't affect cereal
self.assertRelatedEqual(self.cereal.related.all(), (
(self.cereal, self.milk),
))
# there should be just one row in the table
self.assertEqual(RelatedObject.objects.count(), 1)
def test_model_level(self):
"""
The RelatedObjectsDescriptor can work at the class-level as well and
applies to all instances of the model - check that when connections are
made between individual instances and then are queried via the class,
that all connections are returned from that model type
"""
self.pizza.related.connect(self.beer)
self.cereal.related.connect(self.milk)
self.mario.related.connect(self.pizza)
self.sam.related.connect(self.beer)
self.soda.related.connect(self.pizza)
self.assertRelatedEqual(Food.related.all(), (
(self.cereal, self.milk),
(self.pizza, self.beer),
))
self.assertRelatedEqual(Beverage.related.all(), (
(self.soda, self.pizza),
))
self.assertRelatedEqual(Person.related.all(), (
(self.sam, self.beer),
(self.mario, self.pizza),
))
def test_custom_connect(self):
"""
Mimic the test_connect() method, but instead use the custom descriptor,
`related_beverages` which goes through the RelatedBeverage model
"""
self.pizza.related_beverages.connect(self.soda)
self.pizza.related_beverages.connect(self.beer)
related = self.pizza.related_beverages.all()
self.assertRelatedEqual(related, (
(self.pizza, self.beer),
(self.pizza, self.soda),
), 'food', 'beverage')
self.sandwich.related_beverages.connect(self.soda)
self.sandwich.related_beverages.connect(self.milk)
related = self.sandwich.related_beverages.all()
self.assertRelatedEqual(related, (
(self.sandwich, self.milk),
(self.sandwich, self.soda),
), 'food', 'beverage')
related = self.cereal.related_beverages.all()
self.assertRelatedEqual(related, ())
def test_custom_model_manager(self):
"""
Mimic the test_model_manager() method, but instead use the custom
descriptor and through model
"""
self.pizza.related_beverages.connect(self.soda)
rel_obj = RelatedBeverage.objects.all()[0] # grab the new related obj
self.cereal.related_beverages.connect(self.milk)
new_rel_obj = RelatedBeverage(beverage=self.beer)
self.pizza.related_beverages.add(new_rel_obj)
self.assertRelatedEqual(self.pizza.related_beverages.all(), (
(self.pizza, self.beer),
(self.pizza, self.soda),
), 'food', 'beverage')
self.pizza.related_beverages.remove(rel_obj)
self.assertRelatedEqual(self.pizza.related_beverages.all(), (
(self.pizza, self.beer),
), 'food', 'beverage')
self.pizza.related_beverages.clear()
self.assertRelatedEqual(self.pizza.related_beverages.all(), ())
# make sure clearing the pizza objects didn't affect cereal
self.assertRelatedEqual(self.cereal.related_beverages.all(), (
(self.cereal, self.milk),
), 'food', 'beverage')
self.assertEqual(RelatedBeverage.objects.count(), 1)
def test_custom_model_level(self):
"""
And lastly, test that the custom descriptor/through-model work as
expected at the model-level (previous tests were instance-level)
"""
self.pizza.related_beverages.connect(self.soda)
self.pizza.related_beverages.connect(self.beer)
self.sandwich.related_beverages.connect(self.soda)
self.cereal.related_beverages.connect(self.milk)
self.assertRelatedEqual(Food.related_beverages.all(), (
(self.cereal, self.milk),
(self.sandwich, self.soda),
(self.pizza, self.beer),
(self.pizza, self.soda),
), 'food', 'beverage')
def test_generic_traversal(self):
"""
Ensure that the RelatedObjectsDescriptor returns a GFKOptimizedQuerySet
when the through model contains a GFK -- also check that the queryset's
optimized lookup works as expected
"""
self.pizza.related.connect(self.beer)
self.pizza.related.connect(self.soda)
self.pizza.related.connect(self.mario)
# the manager returns instances of GFKOptimizedQuerySet
related = self.pizza.related.all()
self.assertEqual(type(related), GFKOptimizedQuerySet)
# check the queryset is using the right field
self.assertEqual(related.get_gfk().name, 'object')
# the custom queryset's optimized lookup works correctly
objects = related.generic_objects()
self.assertEqual(objects, [self.mario, self.soda, self.beer])
# check the reverse does not hold, documenting existing behavior since
# it looks at only the "default" manager on the back-side
related = self.soda.related.related_to()
self.assertEqual(type(related), GFKOptimizedQuerySet)
# check the queryset is using the right field
self.assertEqual(related.get_gfk().name, 'parent')
# the custom queryset's optimized lookup works correctly
objects = related.generic_objects()
self.assertEqual(objects, [self.pizza])
def test_filtering(self):
"""
Check that filtering on RelatedObject fields (or through model fields)
works as expected
"""
self.pizza.related.connect(self.beer, alias='bud lite')
self.pizza.related.connect(self.soda, alias='pepsi')
self.pizza.related.connect(self.mario)
rel_qs = self.pizza.related.filter(alias='bud lite')
self.assertRelatedEqual(rel_qs, (
(self.pizza, self.beer),
))
rel_qs = self.pizza.related.filter(object_type=ContentType.objects.get_for_model(Beverage))
self.assertRelatedEqual(rel_qs, (
(self.pizza, self.soda),
(self.pizza, self.beer),
))
rel_qs = self.beer.related.related_to().filter(alias='bud lite')
self.assertRelatedEqual(rel_qs, (
(self.pizza, self.beer),
))
def test_custom_model_using_gfks(self):
"""
Check that using a custom through model with GFKs works as expected
(looking at models.py, Note uses `AnotherRelatedObject` as its through)
"""
self.note_a = Note.objects.create(content='a')
self.note_b = Note.objects.create(content='b')
self.note_c = Note.objects.create(content='c')
self.note_a.related.connect(self.pizza)
self.note_a.related.connect(self.note_b)
self.pizza.related.connect(self.note_b)
# create some notes with custom attributes
self.note_b.related.connect(self.cereal, alias='cereal note', description='lucky charms!')
self.note_b.related.connect(self.milk, alias='milk note', description='goes good with cereal')
# ensure that the queryset is using the correct model and automatically
# determines that a GFKOptimizedQuerySet can be used
queryset = self.note_a.related.all()
self.assertEqual(queryset.model, AnotherRelatedObject)
self.assertTrue(isinstance(queryset, GFKOptimizedQuerySet))
related_a = self.note_a.related.all()
self.assertRelatedEqual(related_a, (
(self.note_a, self.pizza),
(self.note_a, self.note_b),
))
related_b = self.note_b.related.all()
self.assertRelatedEqual(related_b, (
(self.note_b, self.cereal),
(self.note_b, self.milk),
))
related_to = self.note_b.related.related_to()
# note that pizza does not show up here even though it is related to note b
# this is because that relationship was stored in a different table (RelatedObject)
# as opposed to AnotherRelatedObject
self.assertEqual(related_to.generic_objects(), [self.note_a])
cereal_rel, milk_rel = related_b
# check that the custom attributes were saved correctly
self.assertEqual(cereal_rel.alias, 'cereal note')
self.assertEqual(cereal_rel.description, 'lucky charms!')
self.assertEqual(milk_rel.alias, 'milk note')
self.assertEqual(milk_rel.description, 'goes good with cereal')
# check that we can filter on fields as expected
self.assertRelatedEqual(self.note_b.related.filter(alias='cereal note'), (
(self.note_b, self.cereal),
))
related_c = self.note_c.related.all()
self.assertRelatedEqual(related_c, ())
# lastly, check that the GFKOptimizedQuerySet returns the expected
# results when doing the optimized lookup
self.assertEqual(related_a.generic_objects(), [
self.pizza, self.note_b
])
self.assertEqual(related_b.generic_objects(), [
self.cereal, self.milk
])
self.assertEqual(related_c.generic_objects(), [])
def test_generic_objects_filtered(self):
"""
Get generic objects filtered by Model.
"""
self.pizza.related.connect(self.beer)
self.pizza.related.connect(self.soda)
self.pizza.related.connect(self.mario)
# Get all generic related content
related = self.pizza.related.all()
objects = related.generic_objects()
self.assertEqual(objects, [self.mario, self.soda, self.beer])
# Get Person generic related content only.
related = self.pizza.related.all()
objects = related.generic_objects(Person)
self.assertEqual(objects, [self.mario])