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django/tests/model_inheritance_regress/tests.py
chetan22 63e6ee1f99 Fixed #29871 -- Allowed setting pk=None on a child model to create a copy.
Thanks Simon Charette and Tim Graham for the initial patch.
2020-01-15 08:28:30 +01:00

590 lines
23 KiB
Python

"""
Regression tests for Model inheritance behavior.
"""
import datetime
from operator import attrgetter
from unittest import expectedFailure
from django import forms
from django.test import TestCase
from .models import (
ArticleWithAuthor, BachelorParty, BirthdayParty, BusStation, Child,
Congressman, DerivedM, InternalCertificationAudit, ItalianRestaurant,
M2MChild, MessyBachelorParty, ParkingLot, ParkingLot3, ParkingLot4A,
ParkingLot4B, Person, Place, Politician, Profile, QualityControl,
Restaurant, SelfRefChild, SelfRefParent, Senator, Supplier, TrainStation,
User, Wholesaler,
)
class ModelInheritanceTest(TestCase):
def test_model_inheritance(self):
# Regression for #7350, #7202
# When you create a Parent object with a specific reference to an
# existent child instance, saving the Parent doesn't duplicate the
# child. This behavior is only activated during a raw save - it is
# mostly relevant to deserialization, but any sort of CORBA style
# 'narrow()' API would require a similar approach.
# Create a child-parent-grandparent chain
place1 = Place(name="Guido's House of Pasta", address='944 W. Fullerton')
place1.save_base(raw=True)
restaurant = Restaurant(
place_ptr=place1,
serves_hot_dogs=True,
serves_pizza=False,
)
restaurant.save_base(raw=True)
italian_restaurant = ItalianRestaurant(restaurant_ptr=restaurant, serves_gnocchi=True)
italian_restaurant.save_base(raw=True)
# Create a child-parent chain with an explicit parent link
place2 = Place(name='Main St', address='111 Main St')
place2.save_base(raw=True)
park = ParkingLot(parent=place2, capacity=100)
park.save_base(raw=True)
# No extra parent objects have been created.
places = list(Place.objects.all())
self.assertEqual(places, [place1, place2])
dicts = list(Restaurant.objects.values('name', 'serves_hot_dogs'))
self.assertEqual(dicts, [{
'name': "Guido's House of Pasta",
'serves_hot_dogs': True
}])
dicts = list(ItalianRestaurant.objects.values(
'name', 'serves_hot_dogs', 'serves_gnocchi'))
self.assertEqual(dicts, [{
'name': "Guido's House of Pasta",
'serves_gnocchi': True,
'serves_hot_dogs': True,
}])
dicts = list(ParkingLot.objects.values('name', 'capacity'))
self.assertEqual(dicts, [{
'capacity': 100,
'name': 'Main St',
}])
# You can also update objects when using a raw save.
place1.name = "Guido's All New House of Pasta"
place1.save_base(raw=True)
restaurant.serves_hot_dogs = False
restaurant.save_base(raw=True)
italian_restaurant.serves_gnocchi = False
italian_restaurant.save_base(raw=True)
place2.name = 'Derelict lot'
place2.save_base(raw=True)
park.capacity = 50
park.save_base(raw=True)
# No extra parent objects after an update, either.
places = list(Place.objects.all())
self.assertEqual(places, [place2, place1])
self.assertEqual(places[0].name, 'Derelict lot')
self.assertEqual(places[1].name, "Guido's All New House of Pasta")
dicts = list(Restaurant.objects.values('name', 'serves_hot_dogs'))
self.assertEqual(dicts, [{
'name': "Guido's All New House of Pasta",
'serves_hot_dogs': False,
}])
dicts = list(ItalianRestaurant.objects.values(
'name', 'serves_hot_dogs', 'serves_gnocchi'))
self.assertEqual(dicts, [{
'name': "Guido's All New House of Pasta",
'serves_gnocchi': False,
'serves_hot_dogs': False,
}])
dicts = list(ParkingLot.objects.values('name', 'capacity'))
self.assertEqual(dicts, [{
'capacity': 50,
'name': 'Derelict lot',
}])
# If you try to raw_save a parent attribute onto a child object,
# the attribute will be ignored.
italian_restaurant.name = "Lorenzo's Pasta Hut"
italian_restaurant.save_base(raw=True)
# Note that the name has not changed
# - name is an attribute of Place, not ItalianRestaurant
dicts = list(ItalianRestaurant.objects.values(
'name', 'serves_hot_dogs', 'serves_gnocchi'))
self.assertEqual(dicts, [{
'name': "Guido's All New House of Pasta",
'serves_gnocchi': False,
'serves_hot_dogs': False,
}])
def test_issue_7105(self):
# Regressions tests for #7105: dates() queries should be able to use
# fields from the parent model as easily as the child.
Child.objects.create(
name='child',
created=datetime.datetime(2008, 6, 26, 17, 0, 0))
datetimes = list(Child.objects.datetimes('created', 'month'))
self.assertEqual(datetimes, [datetime.datetime(2008, 6, 1, 0, 0)])
def test_issue_7276(self):
# Regression test for #7276: calling delete() on a model with
# multi-table inheritance should delete the associated rows from any
# ancestor tables, as well as any descendent objects.
place1 = Place(name="Guido's House of Pasta", address='944 W. Fullerton')
place1.save_base(raw=True)
restaurant = Restaurant(
place_ptr=place1,
serves_hot_dogs=True,
serves_pizza=False,
)
restaurant.save_base(raw=True)
italian_restaurant = ItalianRestaurant(restaurant_ptr=restaurant, serves_gnocchi=True)
italian_restaurant.save_base(raw=True)
ident = ItalianRestaurant.objects.all()[0].id
self.assertEqual(Place.objects.get(pk=ident), place1)
Restaurant.objects.create(
name='a',
address='xx',
serves_hot_dogs=True,
serves_pizza=False,
)
# This should delete both Restaurants, plus the related places, plus
# the ItalianRestaurant.
Restaurant.objects.all().delete()
with self.assertRaises(Place.DoesNotExist):
Place.objects.get(pk=ident)
with self.assertRaises(ItalianRestaurant.DoesNotExist):
ItalianRestaurant.objects.get(pk=ident)
def test_issue_6755(self):
"""
Regression test for #6755
"""
r = Restaurant(serves_pizza=False, serves_hot_dogs=False)
r.save()
self.assertEqual(r.id, r.place_ptr_id)
orig_id = r.id
r = Restaurant(place_ptr_id=orig_id, serves_pizza=True, serves_hot_dogs=False)
r.save()
self.assertEqual(r.id, orig_id)
self.assertEqual(r.id, r.place_ptr_id)
def test_issue_7488(self):
# Regression test for #7488. This looks a little crazy, but it's the
# equivalent of what the admin interface has to do for the edit-inline
# case.
suppliers = Supplier.objects.filter(
restaurant=Restaurant(name='xx', address='yy'))
suppliers = list(suppliers)
self.assertEqual(suppliers, [])
def test_issue_11764(self):
"""
Regression test for #11764
"""
wholesalers = list(Wholesaler.objects.all().select_related())
self.assertEqual(wholesalers, [])
def test_issue_7853(self):
"""
Regression test for #7853
If the parent class has a self-referential link, make sure that any
updates to that link via the child update the right table.
"""
obj = SelfRefChild.objects.create(child_data=37, parent_data=42)
obj.delete()
def test_get_next_previous_by_date(self):
"""
Regression tests for #8076
get_(next/previous)_by_date should work
"""
c1 = ArticleWithAuthor(
headline='ArticleWithAuthor 1',
author="Person 1",
pub_date=datetime.datetime(2005, 8, 1, 3, 0))
c1.save()
c2 = ArticleWithAuthor(
headline='ArticleWithAuthor 2',
author="Person 2",
pub_date=datetime.datetime(2005, 8, 1, 10, 0))
c2.save()
c3 = ArticleWithAuthor(
headline='ArticleWithAuthor 3',
author="Person 3",
pub_date=datetime.datetime(2005, 8, 2))
c3.save()
self.assertEqual(c1.get_next_by_pub_date(), c2)
self.assertEqual(c2.get_next_by_pub_date(), c3)
with self.assertRaises(ArticleWithAuthor.DoesNotExist):
c3.get_next_by_pub_date()
self.assertEqual(c3.get_previous_by_pub_date(), c2)
self.assertEqual(c2.get_previous_by_pub_date(), c1)
with self.assertRaises(ArticleWithAuthor.DoesNotExist):
c1.get_previous_by_pub_date()
def test_inherited_fields(self):
"""
Regression test for #8825 and #9390
Make sure all inherited fields (esp. m2m fields, in this case) appear
on the child class.
"""
m2mchildren = list(M2MChild.objects.filter(articles__isnull=False))
self.assertEqual(m2mchildren, [])
# Ordering should not include any database column more than once (this
# is most likely to occur naturally with model inheritance, so we
# check it here). Regression test for #9390. This necessarily pokes at
# the SQL string for the query, since the duplicate problems are only
# apparent at that late stage.
qs = ArticleWithAuthor.objects.order_by('pub_date', 'pk')
sql = qs.query.get_compiler(qs.db).as_sql()[0]
fragment = sql[sql.find('ORDER BY'):]
pos = fragment.find('pub_date')
self.assertEqual(fragment.find('pub_date', pos + 1), -1)
def test_queryset_update_on_parent_model(self):
"""
Regression test for #10362
It is possible to call update() and only change a field in
an ancestor model.
"""
article = ArticleWithAuthor.objects.create(
author="fred",
headline="Hey there!",
pub_date=datetime.datetime(2009, 3, 1, 8, 0, 0),
)
update = ArticleWithAuthor.objects.filter(author='fred').update(headline='Oh, no!')
self.assertEqual(update, 1)
update = ArticleWithAuthor.objects.filter(pk=article.pk).update(headline='Oh, no!')
self.assertEqual(update, 1)
derivedm1 = DerivedM.objects.create(
customPK=44,
base_name="b1",
derived_name='d1',
)
self.assertEqual(derivedm1.customPK, 44)
self.assertEqual(derivedm1.base_name, 'b1')
self.assertEqual(derivedm1.derived_name, 'd1')
derivedms = list(DerivedM.objects.all())
self.assertEqual(derivedms, [derivedm1])
def test_use_explicit_o2o_to_parent_as_pk(self):
"""
The connector from child to parent need not be the pk on the child.
"""
self.assertEqual(ParkingLot3._meta.pk.name, "primary_key")
# the child->parent link
self.assertEqual(ParkingLot3._meta.get_ancestor_link(Place).name, "parent")
def test_use_explicit_o2o_to_parent_from_abstract_model(self):
self.assertEqual(ParkingLot4A._meta.pk.name, "parent")
ParkingLot4A.objects.create(
name="Parking4A",
address='21 Jump Street',
)
self.assertEqual(ParkingLot4B._meta.pk.name, "parent")
ParkingLot4A.objects.create(
name="Parking4B",
address='21 Jump Street',
)
def test_all_fields_from_abstract_base_class(self):
"""
Regression tests for #7588
"""
# All fields from an ABC, including those inherited non-abstractly
# should be available on child classes (#7588). Creating this instance
# should work without error.
QualityControl.objects.create(
headline="Problems in Django",
pub_date=datetime.datetime.now(),
quality=10,
assignee='adrian',
)
def test_abstract_base_class_m2m_relation_inheritance(self):
# many-to-many relations defined on an abstract base class are
# correctly inherited (and created) on the child class.
p1 = Person.objects.create(name='Alice')
p2 = Person.objects.create(name='Bob')
p3 = Person.objects.create(name='Carol')
p4 = Person.objects.create(name='Dave')
birthday = BirthdayParty.objects.create(name='Birthday party for Alice')
birthday.attendees.set([p1, p3])
bachelor = BachelorParty.objects.create(name='Bachelor party for Bob')
bachelor.attendees.set([p2, p4])
parties = list(p1.birthdayparty_set.all())
self.assertEqual(parties, [birthday])
parties = list(p1.bachelorparty_set.all())
self.assertEqual(parties, [])
parties = list(p2.bachelorparty_set.all())
self.assertEqual(parties, [bachelor])
# A subclass of a subclass of an abstract model doesn't get its own
# accessor.
self.assertFalse(hasattr(p2, 'messybachelorparty_set'))
# ... but it does inherit the m2m from its parent
messy = MessyBachelorParty.objects.create(name='Bachelor party for Dave')
messy.attendees.set([p4])
messy_parent = messy.bachelorparty_ptr
parties = list(p4.bachelorparty_set.all())
self.assertEqual(parties, [bachelor, messy_parent])
def test_abstract_verbose_name_plural_inheritance(self):
"""
verbose_name_plural correctly inherited from ABC if inheritance chain
includes an abstract model.
"""
# Regression test for #11369: verbose_name_plural should be inherited
# from an ABC even when there are one or more intermediate
# abstract models in the inheritance chain, for consistency with
# verbose_name.
self.assertEqual(
InternalCertificationAudit._meta.verbose_name_plural,
'Audits'
)
def test_inherited_nullable_exclude(self):
obj = SelfRefChild.objects.create(child_data=37, parent_data=42)
self.assertQuerysetEqual(
SelfRefParent.objects.exclude(self_data=72), [
obj.pk
],
attrgetter("pk")
)
self.assertQuerysetEqual(
SelfRefChild.objects.exclude(self_data=72), [
obj.pk
],
attrgetter("pk")
)
def test_concrete_abstract_concrete_pk(self):
"""
Primary key set correctly with concrete->abstract->concrete inheritance.
"""
# Regression test for #13987: Primary key is incorrectly determined
# when more than one model has a concrete->abstract->concrete
# inheritance hierarchy.
self.assertEqual(
len([field for field in BusStation._meta.local_fields if field.primary_key]),
1
)
self.assertEqual(
len([field for field in TrainStation._meta.local_fields if field.primary_key]),
1
)
self.assertIs(BusStation._meta.pk.model, BusStation)
self.assertIs(TrainStation._meta.pk.model, TrainStation)
def test_inherited_unique_field_with_form(self):
"""
A model which has different primary key for the parent model passes
unique field checking correctly (#17615).
"""
class ProfileForm(forms.ModelForm):
class Meta:
model = Profile
fields = '__all__'
User.objects.create(username="user_only")
p = Profile.objects.create(username="user_with_profile")
form = ProfileForm({'username': "user_with_profile", 'extra': "hello"}, instance=p)
self.assertTrue(form.is_valid())
def test_inheritance_joins(self):
# Test for #17502 - check that filtering through two levels of
# inheritance chain doesn't generate extra joins.
qs = ItalianRestaurant.objects.all()
self.assertEqual(str(qs.query).count('JOIN'), 2)
qs = ItalianRestaurant.objects.filter(name='foo')
self.assertEqual(str(qs.query).count('JOIN'), 2)
@expectedFailure
def test_inheritance_values_joins(self):
# It would be nice (but not too important) to skip the middle join in
# this case. Skipping is possible as nothing from the middle model is
# used in the qs and top contains direct pointer to the bottom model.
qs = ItalianRestaurant.objects.values_list('serves_gnocchi').filter(name='foo')
self.assertEqual(str(qs.query).count('JOIN'), 1)
def test_issue_21554(self):
senator = Senator.objects.create(name='John Doe', title='X', state='Y')
senator = Senator.objects.get(pk=senator.pk)
self.assertEqual(senator.name, 'John Doe')
self.assertEqual(senator.title, 'X')
self.assertEqual(senator.state, 'Y')
def test_inheritance_resolve_columns(self):
Restaurant.objects.create(name='Bobs Cafe', address="Somewhere",
serves_pizza=True, serves_hot_dogs=True)
p = Place.objects.all().select_related('restaurant')[0]
self.assertIsInstance(p.restaurant.serves_pizza, bool)
def test_inheritance_select_related(self):
# Regression test for #7246
r1 = Restaurant.objects.create(
name="Nobu", serves_hot_dogs=True, serves_pizza=False
)
r2 = Restaurant.objects.create(
name="Craft", serves_hot_dogs=False, serves_pizza=True
)
Supplier.objects.create(name="John", restaurant=r1)
Supplier.objects.create(name="Jane", restaurant=r2)
self.assertQuerysetEqual(
Supplier.objects.order_by("name").select_related(), [
"Jane",
"John",
],
attrgetter("name")
)
jane = Supplier.objects.order_by("name").select_related("restaurant")[0]
self.assertEqual(jane.restaurant.name, "Craft")
def test_filter_with_parent_fk(self):
r = Restaurant.objects.create()
s = Supplier.objects.create(restaurant=r)
# The mismatch between Restaurant and Place is intentional (#28175).
self.assertSequenceEqual(Supplier.objects.filter(restaurant__in=Place.objects.all()), [s])
def test_ptr_accessor_assigns_state(self):
r = Restaurant.objects.create()
self.assertIs(r.place_ptr._state.adding, False)
self.assertEqual(r.place_ptr._state.db, 'default')
def test_related_filtering_query_efficiency_ticket_15844(self):
r = Restaurant.objects.create(
name="Guido's House of Pasta",
address='944 W. Fullerton',
serves_hot_dogs=True,
serves_pizza=False,
)
s = Supplier.objects.create(restaurant=r)
with self.assertNumQueries(1):
self.assertSequenceEqual(Supplier.objects.filter(restaurant=r), [s])
with self.assertNumQueries(1):
self.assertSequenceEqual(r.supplier_set.all(), [s])
def test_queries_on_parent_access(self):
italian_restaurant = ItalianRestaurant.objects.create(
name="Guido's House of Pasta",
address='944 W. Fullerton',
serves_hot_dogs=True,
serves_pizza=False,
serves_gnocchi=True,
)
# No queries are made when accessing the parent objects.
italian_restaurant = ItalianRestaurant.objects.get(pk=italian_restaurant.pk)
with self.assertNumQueries(0):
restaurant = italian_restaurant.restaurant_ptr
self.assertEqual(restaurant.place_ptr.restaurant, restaurant)
self.assertEqual(restaurant.italianrestaurant, italian_restaurant)
# One query is made when accessing the parent objects when the instance
# is deferred.
italian_restaurant = ItalianRestaurant.objects.only('serves_gnocchi').get(pk=italian_restaurant.pk)
with self.assertNumQueries(1):
restaurant = italian_restaurant.restaurant_ptr
self.assertEqual(restaurant.place_ptr.restaurant, restaurant)
self.assertEqual(restaurant.italianrestaurant, italian_restaurant)
# No queries are made when accessing the parent objects when the
# instance has deferred a field not present in the parent table.
italian_restaurant = ItalianRestaurant.objects.defer('serves_gnocchi').get(pk=italian_restaurant.pk)
with self.assertNumQueries(0):
restaurant = italian_restaurant.restaurant_ptr
self.assertEqual(restaurant.place_ptr.restaurant, restaurant)
self.assertEqual(restaurant.italianrestaurant, italian_restaurant)
def test_id_field_update_on_ancestor_change(self):
place1 = Place.objects.create(name='House of Pasta', address='944 Fullerton')
place2 = Place.objects.create(name='House of Pizza', address='954 Fullerton')
place3 = Place.objects.create(name='Burger house', address='964 Fullerton')
restaurant1 = Restaurant.objects.create(
place_ptr=place1,
serves_hot_dogs=True,
serves_pizza=False,
)
restaurant2 = Restaurant.objects.create(
place_ptr=place2,
serves_hot_dogs=True,
serves_pizza=False,
)
italian_restaurant = ItalianRestaurant.objects.create(
restaurant_ptr=restaurant1,
serves_gnocchi=True,
)
# Changing the parent of a restaurant changes the restaurant's ID & PK.
restaurant1.place_ptr = place3
self.assertEqual(restaurant1.pk, place3.pk)
self.assertEqual(restaurant1.id, place3.id)
self.assertEqual(restaurant1.pk, restaurant1.id)
restaurant1.place_ptr = None
self.assertIsNone(restaurant1.pk)
self.assertIsNone(restaurant1.id)
# Changing the parent of an italian restaurant changes the restaurant's
# ID & PK.
italian_restaurant.restaurant_ptr = restaurant2
self.assertEqual(italian_restaurant.pk, restaurant2.pk)
self.assertEqual(italian_restaurant.id, restaurant2.id)
self.assertEqual(italian_restaurant.pk, italian_restaurant.id)
italian_restaurant.restaurant_ptr = None
self.assertIsNone(italian_restaurant.pk)
self.assertIsNone(italian_restaurant.id)
def test_create_new_instance_with_pk_equals_none(self):
p1 = Profile.objects.create(username='john')
p2 = User.objects.get(pk=p1.user_ptr_id).profile
# Create a new profile by setting pk = None.
p2.pk = None
p2.user_ptr_id = None
p2.username = 'bill'
p2.save()
self.assertEqual(Profile.objects.count(), 2)
self.assertEqual(User.objects.get(pk=p1.user_ptr_id).username, 'john')
def test_create_new_instance_with_pk_equals_none_multi_inheritance(self):
c1 = Congressman.objects.create(state='PA', name='John', title='senator 1')
c2 = Person.objects.get(pk=c1.pk).congressman
# Create a new congressman by setting pk = None.
c2.pk = None
c2.id = None
c2.politician_ptr_id = None
c2.name = 'Bill'
c2.title = 'senator 2'
c2.save()
self.assertEqual(Congressman.objects.count(), 2)
self.assertEqual(Person.objects.get(pk=c1.pk).name, 'John')
self.assertEqual(
Politician.objects.get(pk=c1.politician_ptr_id).title,
'senator 1',
)