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"""
Regression tests for Model inheritance behavior.
"""
from __future__ import unicode_literals
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,
DerivedM, InternalCertificationAudit, ItalianRestaurant, M2MChild,
MessyBachelorParty, ParkingLot, ParkingLot2, ParkingLot3, ParkingLot4A,
ParkingLot4B, Person, Place, Profile, QualityControl, Restaurant,
SelfRefChild, SelfRefParent, Senator, Supplier, TrainStation, User,
Wholesaler,
)
class ModelInheritanceTest(TestCase):
def test_model_inheritance(self):
# Regression for #7350, #7202
# Check that 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)
# Check that 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()
self.assertRaises(
Place.DoesNotExist,
Place.objects.get,
pk=ident)
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)
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)
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):
"""
Regression tests for #10406
If there's a one-to-one link between a child model and the parent and
no explicit pk declared, we can use the one-to-one link as the pk on
the child.
"""
self.assertEqual(ParkingLot2._meta.pk.name, "parent")
# However, the connector from child to parent need not be the pk on
# the child at all.
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):
# Check that 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 = [p1, p3]
bachelor = BachelorParty.objects.create(name='Bachelor party for Bob')
bachelor.attendees = [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])
# Check that 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 = [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):
"""
Test that a model which has different primary key for the parent model
passes unique field checking correctly. Refs #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.objects.get(pk=senator.pk)
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")
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