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474 lines
18 KiB
Python
474 lines
18 KiB
Python
from __future__ import unicode_literals
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from operator import attrgetter
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from django.core.exceptions import FieldError, ValidationError
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from django.core.management import call_command
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from django.db import connection, models
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from django.test import TestCase, TransactionTestCase
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from django.test.utils import CaptureQueriesContext, isolate_apps
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from django.utils import six
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from .models import (
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Base, Chef, CommonInfo, Copy, GrandChild, GrandParent, ItalianRestaurant,
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MixinModel, ParkingLot, Place, Post, Restaurant, Student, SubBase,
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Supplier, Title, Worker,
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)
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class ModelInheritanceTests(TestCase):
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def test_abstract(self):
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# The Student and Worker models both have 'name' and 'age' fields on
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# them and inherit the __str__() method, just as with normal Python
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# subclassing. This is useful if you want to factor out common
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# information for programming purposes, but still completely
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# independent separate models at the database level.
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w1 = Worker.objects.create(name="Fred", age=35, job="Quarry worker")
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Worker.objects.create(name="Barney", age=34, job="Quarry worker")
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s = Student.objects.create(name="Pebbles", age=5, school_class="1B")
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self.assertEqual(six.text_type(w1), "Worker Fred")
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self.assertEqual(six.text_type(s), "Student Pebbles")
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# The children inherit the Meta class of their parents (if they don't
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# specify their own).
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self.assertQuerysetEqual(
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Worker.objects.values("name"), [
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{"name": "Barney"},
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{"name": "Fred"},
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],
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lambda o: o
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)
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# Since Student does not subclass CommonInfo's Meta, it has the effect
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# of completely overriding it. So ordering by name doesn't take place
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# for Students.
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self.assertEqual(Student._meta.ordering, [])
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# However, the CommonInfo class cannot be used as a normal model (it
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# doesn't exist as a model).
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with self.assertRaises(AttributeError):
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CommonInfo.objects.all()
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def test_reverse_relation_for_different_hierarchy_tree(self):
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# Even though p.supplier for a Place 'p' (a parent of a Supplier), a
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# Restaurant object cannot access that reverse relation, since it's not
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# part of the Place-Supplier Hierarchy.
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self.assertQuerysetEqual(Place.objects.filter(supplier__name="foo"), [])
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with self.assertRaises(FieldError):
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Restaurant.objects.filter(supplier__name="foo")
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def test_model_with_distinct_accessors(self):
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# The Post model has distinct accessors for the Comment and Link models.
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post = Post.objects.create(title="Lorem Ipsum")
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post.attached_comment_set.create(content="Save $ on V1agr@", is_spam=True)
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post.attached_link_set.create(
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content="The Web framework for perfections with deadlines.",
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url="http://www.djangoproject.com/"
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)
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# The Post model doesn't have an attribute called
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# 'attached_%(class)s_set'.
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with self.assertRaises(AttributeError):
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getattr(post, "attached_%(class)s_set")
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def test_model_with_distinct_related_query_name(self):
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self.assertQuerysetEqual(Post.objects.filter(attached_model_inheritance_comments__is_spam=True), [])
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# The Post model doesn't have a related query accessor based on
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# related_name (attached_comment_set).
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msg = "Cannot resolve keyword 'attached_comment_set' into field."
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with self.assertRaisesMessage(FieldError, msg):
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Post.objects.filter(attached_comment_set__is_spam=True)
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def test_meta_fields_and_ordering(self):
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# Make sure Restaurant and ItalianRestaurant have the right fields in
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# the right order.
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self.assertEqual(
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[f.name for f in Restaurant._meta.fields],
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["id", "name", "address", "place_ptr", "rating", "serves_hot_dogs",
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"serves_pizza", "chef"]
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)
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self.assertEqual(
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[f.name for f in ItalianRestaurant._meta.fields],
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["id", "name", "address", "place_ptr", "rating", "serves_hot_dogs",
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"serves_pizza", "chef", "restaurant_ptr", "serves_gnocchi"],
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)
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self.assertEqual(Restaurant._meta.ordering, ["-rating"])
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def test_custompk_m2m(self):
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b = Base.objects.create()
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b.titles.add(Title.objects.create(title="foof"))
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s = SubBase.objects.create(sub_id=b.id)
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b = Base.objects.get(pk=s.id)
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self.assertNotEqual(b.pk, s.pk)
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# Low-level test for related_val
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self.assertEqual(s.titles.related_val, (s.id,))
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# Higher level test for correct query values (title foof not
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# accidentally found).
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self.assertQuerysetEqual(s.titles.all(), [])
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def test_update_parent_filtering(self):
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"""
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Test that updating a field of a model subclass doesn't issue an UPDATE
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query constrained by an inner query.
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Refs #10399
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"""
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supplier = Supplier.objects.create(
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name='Central market',
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address='610 some street',
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)
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# Capture the expected query in a database agnostic way
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with CaptureQueriesContext(connection) as captured_queries:
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Place.objects.filter(pk=supplier.pk).update(name=supplier.name)
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expected_sql = captured_queries[0]['sql']
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# Capture the queries executed when a subclassed model instance is saved.
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with CaptureQueriesContext(connection) as captured_queries:
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supplier.save(update_fields=('name',))
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for query in captured_queries:
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sql = query['sql']
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if 'UPDATE' in sql:
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self.assertEqual(expected_sql, sql)
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def test_eq(self):
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# Equality doesn't transfer in multitable inheritance.
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self.assertNotEqual(Place(id=1), Restaurant(id=1))
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self.assertNotEqual(Restaurant(id=1), Place(id=1))
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def test_mixin_init(self):
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m = MixinModel()
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self.assertEqual(m.other_attr, 1)
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@isolate_apps('model_inheritance')
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def test_abstract_parent_link(self):
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class A(models.Model):
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pass
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class B(A):
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a = models.OneToOneField('A', parent_link=True, on_delete=models.CASCADE)
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class Meta:
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abstract = True
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class C(B):
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pass
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self.assertIs(C._meta.parents[A], C._meta.get_field('a'))
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class ModelInheritanceDataTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.restaurant = Restaurant.objects.create(
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name="Demon Dogs",
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address="944 W. Fullerton",
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serves_hot_dogs=True,
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serves_pizza=False,
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rating=2,
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)
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chef = Chef.objects.create(name="Albert")
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cls.italian_restaurant = ItalianRestaurant.objects.create(
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name="Ristorante Miron",
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address="1234 W. Ash",
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serves_hot_dogs=False,
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serves_pizza=False,
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serves_gnocchi=True,
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rating=4,
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chef=chef,
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)
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def test_filter_inherited_model(self):
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self.assertQuerysetEqual(
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ItalianRestaurant.objects.filter(address="1234 W. Ash"), [
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"Ristorante Miron",
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],
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attrgetter("name")
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)
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def test_update_inherited_model(self):
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self.italian_restaurant.address = "1234 W. Elm"
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self.italian_restaurant.save()
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self.assertQuerysetEqual(
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ItalianRestaurant.objects.filter(address="1234 W. Elm"), [
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"Ristorante Miron",
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],
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attrgetter("name")
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)
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def test_parent_fields_available_for_filtering_in_child_model(self):
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# Parent fields can be used directly in filters on the child model.
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self.assertQuerysetEqual(
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Restaurant.objects.filter(name="Demon Dogs"), [
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"Demon Dogs",
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],
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attrgetter("name")
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)
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self.assertQuerysetEqual(
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ItalianRestaurant.objects.filter(address="1234 W. Ash"), [
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"Ristorante Miron",
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],
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attrgetter("name")
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)
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def test_filter_on_parent_returns_object_of_parent_type(self):
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# Filters against the parent model return objects of the parent's type.
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p = Place.objects.get(name="Demon Dogs")
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self.assertIs(type(p), Place)
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def test_parent_child_one_to_one_link(self):
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# Since the parent and child are linked by an automatically created
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# OneToOneField, you can get from the parent to the child by using the
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# child's name.
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self.assertEqual(
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Place.objects.get(name="Demon Dogs").restaurant,
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Restaurant.objects.get(name="Demon Dogs")
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)
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self.assertEqual(
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Place.objects.get(name="Ristorante Miron").restaurant.italianrestaurant,
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ItalianRestaurant.objects.get(name="Ristorante Miron")
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)
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self.assertEqual(
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Restaurant.objects.get(name="Ristorante Miron").italianrestaurant,
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ItalianRestaurant.objects.get(name="Ristorante Miron")
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)
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def test_parent_child_one_to_one_link_on_nonrelated_objects(self):
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# This won't work because the Demon Dogs restaurant is not an Italian
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# restaurant.
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with self.assertRaises(ItalianRestaurant.DoesNotExist):
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Place.objects.get(name="Demon Dogs").restaurant.italianrestaurant
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def test_inherited_does_not_exist_exception(self):
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# An ItalianRestaurant which does not exist is also a Place which does
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# not exist.
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with self.assertRaises(Place.DoesNotExist):
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ItalianRestaurant.objects.get(name="The Noodle Void")
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def test_inherited_multiple_objects_returned_exception(self):
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# MultipleObjectsReturned is also inherited.
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with self.assertRaises(Place.MultipleObjectsReturned):
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Restaurant.objects.get()
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def test_related_objects_for_inherited_models(self):
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# Related objects work just as they normally do.
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s1 = Supplier.objects.create(name="Joe's Chickens", address="123 Sesame St")
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s1.customers .set([self.restaurant, self.italian_restaurant])
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s2 = Supplier.objects.create(name="Luigi's Pasta", address="456 Sesame St")
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s2.customers.set([self.italian_restaurant])
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# This won't work because the Place we select is not a Restaurant (it's
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# a Supplier).
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p = Place.objects.get(name="Joe's Chickens")
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with self.assertRaises(Restaurant.DoesNotExist):
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p.restaurant
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self.assertEqual(p.supplier, s1)
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self.assertQuerysetEqual(
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self.italian_restaurant.provider.order_by("-name"), [
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"Luigi's Pasta",
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"Joe's Chickens"
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],
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attrgetter("name")
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)
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self.assertQuerysetEqual(
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Restaurant.objects.filter(provider__name__contains="Chickens"), [
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"Ristorante Miron",
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"Demon Dogs",
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],
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attrgetter("name")
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)
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self.assertQuerysetEqual(
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ItalianRestaurant.objects.filter(provider__name__contains="Chickens"), [
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"Ristorante Miron",
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],
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attrgetter("name"),
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)
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ParkingLot.objects.create(
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name="Main St", address="111 Main St", main_site=s1
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)
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ParkingLot.objects.create(
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name="Well Lit", address="124 Sesame St", main_site=self.italian_restaurant
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)
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self.assertEqual(
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Restaurant.objects.get(lot__name="Well Lit").name,
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"Ristorante Miron"
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)
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def test_update_works_on_parent_and_child_models_at_once(self):
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# The update() command can update fields in parent and child classes at
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# once (although it executed multiple SQL queries to do so).
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rows = Restaurant.objects.filter(
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serves_hot_dogs=True, name__contains="D"
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).update(
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name="Demon Puppies", serves_hot_dogs=False
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)
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self.assertEqual(rows, 1)
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r1 = Restaurant.objects.get(pk=self.restaurant.pk)
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self.assertFalse(r1.serves_hot_dogs)
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self.assertEqual(r1.name, "Demon Puppies")
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def test_values_works_on_parent_model_fields(self):
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# The values() command also works on fields from parent models.
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self.assertQuerysetEqual(
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ItalianRestaurant.objects.values("name", "rating"), [
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{"rating": 4, "name": "Ristorante Miron"},
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],
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lambda o: o
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)
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def test_select_related_works_on_parent_model_fields(self):
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# select_related works with fields from the parent object as if they
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# were a normal part of the model.
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self.assertNumQueries(
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2, lambda: ItalianRestaurant.objects.all()[0].chef
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)
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self.assertNumQueries(
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1, lambda: ItalianRestaurant.objects.select_related("chef")[0].chef
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)
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def test_select_related_defer(self):
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"""
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#23370 - Should be able to defer child fields when using
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select_related() from parent to child.
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"""
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qs = (Restaurant.objects.select_related("italianrestaurant")
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.defer("italianrestaurant__serves_gnocchi").order_by("rating"))
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# Test that the field was actually deferred
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with self.assertNumQueries(2):
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objs = list(qs.all())
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self.assertTrue(objs[1].italianrestaurant.serves_gnocchi)
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# Test that model fields where assigned correct values
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self.assertEqual(qs[0].name, 'Demon Dogs')
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self.assertEqual(qs[0].rating, 2)
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self.assertEqual(qs[1].italianrestaurant.name, 'Ristorante Miron')
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self.assertEqual(qs[1].italianrestaurant.rating, 4)
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def test_update_query_counts(self):
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"""
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Test that update queries do not generate non-necessary queries.
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Refs #18304.
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"""
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with self.assertNumQueries(3):
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self.italian_restaurant.save()
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def test_filter_inherited_on_null(self):
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# Refs #12567
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Supplier.objects.create(
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name="Central market",
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address="610 some street",
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)
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self.assertQuerysetEqual(
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Place.objects.filter(supplier__isnull=False), [
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"Central market",
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],
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attrgetter("name")
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)
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self.assertQuerysetEqual(
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Place.objects.filter(supplier__isnull=True).order_by("name"), [
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"Demon Dogs",
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"Ristorante Miron",
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],
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attrgetter("name")
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)
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def test_exclude_inherited_on_null(self):
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# Refs #12567
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Supplier.objects.create(
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name="Central market",
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address="610 some street",
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)
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self.assertQuerysetEqual(
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Place.objects.exclude(supplier__isnull=False).order_by("name"), [
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"Demon Dogs",
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"Ristorante Miron",
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],
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attrgetter("name")
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)
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self.assertQuerysetEqual(
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Place.objects.exclude(supplier__isnull=True), [
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"Central market",
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],
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attrgetter("name")
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)
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class InheritanceSameModelNameTests(TransactionTestCase):
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available_apps = ['model_inheritance']
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def setUp(self):
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# The Title model has distinct accessors for both
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# model_inheritance.Copy and model_inheritance_same_model_name.Copy
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# models.
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self.title = Title.objects.create(title='Lorem Ipsum')
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def test_inheritance_related_name(self):
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self.assertEqual(
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self.title.attached_model_inheritance_copy_set.create(
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content='Save $ on V1agr@',
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url='http://v1agra.com/',
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title='V1agra is spam',
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), Copy.objects.get(
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content='Save $ on V1agr@',
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))
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def test_inheritance_with_same_model_name(self):
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with self.modify_settings(
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INSTALLED_APPS={'append': ['model_inheritance.same_model_name']}):
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call_command('migrate', verbosity=0, run_syncdb=True)
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from .same_model_name.models import Copy
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copy = self.title.attached_same_model_name_copy_set.create(
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content='The Web framework for perfectionists with deadlines.',
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url='http://www.djangoproject.com/',
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title='Django Rocks'
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)
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self.assertEqual(
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copy,
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Copy.objects.get(
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content='The Web framework for perfectionists with deadlines.',
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))
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# We delete the copy manually so that it doesn't block the flush
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# command under Oracle (which does not cascade deletions).
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copy.delete()
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def test_related_name_attribute_exists(self):
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# The Post model doesn't have an attribute called 'attached_%(app_label)s_%(class)s_set'.
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self.assertFalse(hasattr(self.title, 'attached_%(app_label)s_%(class)s_set'))
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class InheritanceUniqueTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.grand_parent = GrandParent.objects.create(
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email='grand_parent@example.com',
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first_name='grand',
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last_name='parent',
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)
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def test_unique(self):
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grand_child = GrandChild(
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email=self.grand_parent.email,
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first_name='grand',
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last_name='child',
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)
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msg = 'Grand parent with this Email already exists.'
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with self.assertRaisesMessage(ValidationError, msg):
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grand_child.validate_unique()
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def test_unique_together(self):
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grand_child = GrandChild(
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email='grand_child@example.com',
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first_name=self.grand_parent.first_name,
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last_name=self.grand_parent.last_name,
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)
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msg = 'Grand parent with this First name and Last name already exists.'
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with self.assertRaisesMessage(ValidationError, msg):
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grand_child.validate_unique()
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