458 lines
17 KiB
Python
458 lines
17 KiB
Python
"""
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Regression tests for Model inheritance behavior.
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"""
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from __future__ import unicode_literals
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import datetime
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from operator import attrgetter
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from unittest import expectedFailure
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from django import forms
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from django.test import TestCase
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from .models import (Place, Restaurant, ItalianRestaurant, ParkingLot,
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ParkingLot2, ParkingLot3, Supplier, Wholesaler, Child, SelfRefParent,
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SelfRefChild, ArticleWithAuthor, M2MChild, QualityControl, DerivedM,
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Person, BirthdayParty, BachelorParty, MessyBachelorParty,
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InternalCertificationAudit, BusStation, TrainStation, User, Profile,
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ParkingLot4A, ParkingLot4B)
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class ModelInheritanceTest(TestCase):
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def test_model_inheritance(self):
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# Regression for #7350, #7202
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# Check that when you create a Parent object with a specific reference
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# to an existent child instance, saving the Parent doesn't duplicate
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# the child. This behavior is only activated during a raw save - it
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# is mostly relevant to deserialization, but any sort of CORBA style
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# 'narrow()' API would require a similar approach.
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# Create a child-parent-grandparent chain
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place1 = Place(
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name="Guido's House of Pasta",
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address='944 W. Fullerton')
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place1.save_base(raw=True)
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restaurant = Restaurant(
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place_ptr=place1,
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serves_hot_dogs=True,
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serves_pizza=False)
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restaurant.save_base(raw=True)
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italian_restaurant = ItalianRestaurant(
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restaurant_ptr=restaurant,
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serves_gnocchi=True)
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italian_restaurant.save_base(raw=True)
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# Create a child-parent chain with an explicit parent link
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place2 = Place(name='Main St', address='111 Main St')
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place2.save_base(raw=True)
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park = ParkingLot(parent=place2, capacity=100)
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park.save_base(raw=True)
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# Check that no extra parent objects have been created.
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places = list(Place.objects.all())
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self.assertEqual(places, [place1, place2])
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dicts = list(Restaurant.objects.values('name','serves_hot_dogs'))
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self.assertEqual(dicts, [{
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'name': "Guido's House of Pasta",
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'serves_hot_dogs': True
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}])
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dicts = list(ItalianRestaurant.objects.values(
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'name','serves_hot_dogs','serves_gnocchi'))
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self.assertEqual(dicts, [{
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'name': "Guido's House of Pasta",
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'serves_gnocchi': True,
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'serves_hot_dogs': True,
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}])
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dicts = list(ParkingLot.objects.values('name','capacity'))
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self.assertEqual(dicts, [{
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'capacity': 100,
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'name': 'Main St',
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}])
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# You can also update objects when using a raw save.
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place1.name = "Guido's All New House of Pasta"
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place1.save_base(raw=True)
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restaurant.serves_hot_dogs = False
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restaurant.save_base(raw=True)
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italian_restaurant.serves_gnocchi = False
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italian_restaurant.save_base(raw=True)
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place2.name='Derelict lot'
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place2.save_base(raw=True)
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park.capacity = 50
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park.save_base(raw=True)
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# No extra parent objects after an update, either.
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places = list(Place.objects.all())
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self.assertEqual(places, [place2, place1])
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self.assertEqual(places[0].name, 'Derelict lot')
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self.assertEqual(places[1].name, "Guido's All New House of Pasta")
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dicts = list(Restaurant.objects.values('name','serves_hot_dogs'))
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self.assertEqual(dicts, [{
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'name': "Guido's All New House of Pasta",
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'serves_hot_dogs': False,
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}])
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dicts = list(ItalianRestaurant.objects.values(
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'name', 'serves_hot_dogs', 'serves_gnocchi'))
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self.assertEqual(dicts, [{
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'name': "Guido's All New House of Pasta",
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'serves_gnocchi': False,
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'serves_hot_dogs': False,
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}])
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dicts = list(ParkingLot.objects.values('name','capacity'))
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self.assertEqual(dicts, [{
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'capacity': 50,
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'name': 'Derelict lot',
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}])
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# If you try to raw_save a parent attribute onto a child object,
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# the attribute will be ignored.
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italian_restaurant.name = "Lorenzo's Pasta Hut"
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italian_restaurant.save_base(raw=True)
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# Note that the name has not changed
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# - name is an attribute of Place, not ItalianRestaurant
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dicts = list(ItalianRestaurant.objects.values(
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'name','serves_hot_dogs','serves_gnocchi'))
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self.assertEqual(dicts, [{
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'name': "Guido's All New House of Pasta",
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'serves_gnocchi': False,
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'serves_hot_dogs': False,
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}])
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def test_issue_7105(self):
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# Regressions tests for #7105: dates() queries should be able to use
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# fields from the parent model as easily as the child.
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obj = Child.objects.create(
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name='child',
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created=datetime.datetime(2008, 6, 26, 17, 0, 0))
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datetimes = list(Child.objects.datetimes('created', 'month'))
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self.assertEqual(datetimes, [datetime.datetime(2008, 6, 1, 0, 0)])
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def test_issue_7276(self):
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# Regression test for #7276: calling delete() on a model with
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# multi-table inheritance should delete the associated rows from any
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# ancestor tables, as well as any descendent objects.
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place1 = Place(
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name="Guido's House of Pasta",
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address='944 W. Fullerton')
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place1.save_base(raw=True)
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restaurant = Restaurant(
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place_ptr=place1,
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serves_hot_dogs=True,
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serves_pizza=False)
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restaurant.save_base(raw=True)
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italian_restaurant = ItalianRestaurant(
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restaurant_ptr=restaurant,
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serves_gnocchi=True)
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italian_restaurant.save_base(raw=True)
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ident = ItalianRestaurant.objects.all()[0].id
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self.assertEqual(Place.objects.get(pk=ident), place1)
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xx = Restaurant.objects.create(
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name='a',
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address='xx',
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serves_hot_dogs=True,
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serves_pizza=False)
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# This should delete both Restuarants, plus the related places, plus
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# the ItalianRestaurant.
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Restaurant.objects.all().delete()
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self.assertRaises(
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Place.DoesNotExist,
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Place.objects.get,
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pk=ident)
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self.assertRaises(
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ItalianRestaurant.DoesNotExist,
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ItalianRestaurant.objects.get,
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pk=ident)
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def test_issue_6755(self):
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"""
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Regression test for #6755
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"""
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r = Restaurant(serves_pizza=False, serves_hot_dogs=False)
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r.save()
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self.assertEqual(r.id, r.place_ptr_id)
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orig_id = r.id
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r = Restaurant(place_ptr_id=orig_id, serves_pizza=True, serves_hot_dogs=False)
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r.save()
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self.assertEqual(r.id, orig_id)
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self.assertEqual(r.id, r.place_ptr_id)
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def test_issue_7488(self):
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# Regression test for #7488. This looks a little crazy, but it's the
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# equivalent of what the admin interface has to do for the edit-inline
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# case.
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suppliers = Supplier.objects.filter(
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restaurant=Restaurant(name='xx', address='yy'))
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suppliers = list(suppliers)
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self.assertEqual(suppliers, [])
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def test_issue_11764(self):
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"""
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Regression test for #11764
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"""
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wholesalers = list(Wholesaler.objects.all().select_related())
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self.assertEqual(wholesalers, [])
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def test_issue_7853(self):
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"""
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Regression test for #7853
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If the parent class has a self-referential link, make sure that any
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updates to that link via the child update the right table.
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"""
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obj = SelfRefChild.objects.create(child_data=37, parent_data=42)
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obj.delete()
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def test_get_next_previous_by_date(self):
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"""
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Regression tests for #8076
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get_(next/previous)_by_date should work
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"""
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c1 = ArticleWithAuthor(
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headline='ArticleWithAuthor 1',
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author="Person 1",
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pub_date=datetime.datetime(2005, 8, 1, 3, 0))
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c1.save()
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c2 = ArticleWithAuthor(
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headline='ArticleWithAuthor 2',
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author="Person 2",
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pub_date=datetime.datetime(2005, 8, 1, 10, 0))
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c2.save()
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c3 = ArticleWithAuthor(
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headline='ArticleWithAuthor 3',
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author="Person 3",
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pub_date=datetime.datetime(2005, 8, 2))
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c3.save()
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self.assertEqual(c1.get_next_by_pub_date(), c2)
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self.assertEqual(c2.get_next_by_pub_date(), c3)
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self.assertRaises(
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ArticleWithAuthor.DoesNotExist,
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c3.get_next_by_pub_date)
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self.assertEqual(c3.get_previous_by_pub_date(), c2)
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self.assertEqual(c2.get_previous_by_pub_date(), c1)
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self.assertRaises(
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ArticleWithAuthor.DoesNotExist,
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c1.get_previous_by_pub_date)
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def test_inherited_fields(self):
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"""
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Regression test for #8825 and #9390
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Make sure all inherited fields (esp. m2m fields, in this case) appear
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on the child class.
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"""
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m2mchildren = list(M2MChild.objects.filter(articles__isnull=False))
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self.assertEqual(m2mchildren, [])
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# Ordering should not include any database column more than once (this
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# is most likely to ocurr naturally with model inheritance, so we
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# check it here). Regression test for #9390. This necessarily pokes at
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# the SQL string for the query, since the duplicate problems are only
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# apparent at that late stage.
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qs = ArticleWithAuthor.objects.order_by('pub_date', 'pk')
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sql = qs.query.get_compiler(qs.db).as_sql()[0]
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fragment = sql[sql.find('ORDER BY'):]
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pos = fragment.find('pub_date')
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self.assertEqual(fragment.find('pub_date', pos + 1), -1)
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def test_queryset_update_on_parent_model(self):
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"""
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Regression test for #10362
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It is possible to call update() and only change a field in
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an ancestor model.
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"""
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article = ArticleWithAuthor.objects.create(
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author="fred",
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headline="Hey there!",
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pub_date=datetime.datetime(2009, 3, 1, 8, 0, 0))
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update = ArticleWithAuthor.objects.filter(
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author="fred").update(headline="Oh, no!")
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self.assertEqual(update, 1)
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update = ArticleWithAuthor.objects.filter(
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pk=article.pk).update(headline="Oh, no!")
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self.assertEqual(update, 1)
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derivedm1 = DerivedM.objects.create(
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customPK=44,
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base_name="b1",
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derived_name="d1")
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self.assertEqual(derivedm1.customPK, 44)
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self.assertEqual(derivedm1.base_name, 'b1')
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self.assertEqual(derivedm1.derived_name, 'd1')
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derivedms = list(DerivedM.objects.all())
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self.assertEqual(derivedms, [derivedm1])
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def test_use_explicit_o2o_to_parent_as_pk(self):
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"""
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Regression tests for #10406
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If there's a one-to-one link between a child model and the parent and
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no explicit pk declared, we can use the one-to-one link as the pk on
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the child.
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"""
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self.assertEqual(ParkingLot2._meta.pk.name, "parent")
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# However, the connector from child to parent need not be the pk on
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# the child at all.
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self.assertEqual(ParkingLot3._meta.pk.name, "primary_key")
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# the child->parent link
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self.assertEqual(
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ParkingLot3._meta.get_ancestor_link(Place).name,
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"parent")
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def test_use_explicit_o2o_to_parent_from_abstract_model(self):
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self.assertEqual(ParkingLot4A._meta.pk.name, "parent")
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ParkingLot4A.objects.create(
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name="Parking4A",
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address='21 Jump Street',
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)
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self.assertEqual(ParkingLot4B._meta.pk.name, "parent")
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ParkingLot4A.objects.create(
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name="Parking4B",
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address='21 Jump Street',
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)
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def test_all_fields_from_abstract_base_class(self):
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"""
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Regression tests for #7588
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"""
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# All fields from an ABC, including those inherited non-abstractly
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# should be available on child classes (#7588). Creating this instance
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# should work without error.
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QualityControl.objects.create(
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headline="Problems in Django",
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pub_date=datetime.datetime.now(),
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quality=10,
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assignee="adrian")
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def test_abstract_base_class_m2m_relation_inheritance(self):
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# Check that many-to-many relations defined on an abstract base class
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# are correctly inherited (and created) on the child class.
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p1 = Person.objects.create(name='Alice')
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p2 = Person.objects.create(name='Bob')
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p3 = Person.objects.create(name='Carol')
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p4 = Person.objects.create(name='Dave')
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birthday = BirthdayParty.objects.create(
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name='Birthday party for Alice')
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birthday.attendees = [p1, p3]
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bachelor = BachelorParty.objects.create(name='Bachelor party for Bob')
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bachelor.attendees = [p2, p4]
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parties = list(p1.birthdayparty_set.all())
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self.assertEqual(parties, [birthday])
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parties = list(p1.bachelorparty_set.all())
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self.assertEqual(parties, [])
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parties = list(p2.bachelorparty_set.all())
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self.assertEqual(parties, [bachelor])
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# Check that a subclass of a subclass of an abstract model doesn't get
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# it's own accessor.
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self.assertFalse(hasattr(p2, 'messybachelorparty_set'))
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# ... but it does inherit the m2m from it's parent
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messy = MessyBachelorParty.objects.create(
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name='Bachelor party for Dave')
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messy.attendees = [p4]
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messy_parent = messy.bachelorparty_ptr
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parties = list(p4.bachelorparty_set.all())
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self.assertEqual(parties, [bachelor, messy_parent])
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def test_abstract_verbose_name_plural_inheritance(self):
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"""
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verbose_name_plural correctly inherited from ABC if inheritance chain
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includes an abstract model.
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"""
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# Regression test for #11369: verbose_name_plural should be inherited
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# from an ABC even when there are one or more intermediate
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# abstract models in the inheritance chain, for consistency with
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# verbose_name.
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self.assertEqual(
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InternalCertificationAudit._meta.verbose_name_plural,
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'Audits'
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)
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def test_inherited_nullable_exclude(self):
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obj = SelfRefChild.objects.create(child_data=37, parent_data=42)
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self.assertQuerysetEqual(
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SelfRefParent.objects.exclude(self_data=72), [
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obj.pk
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],
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attrgetter("pk")
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)
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self.assertQuerysetEqual(
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SelfRefChild.objects.exclude(self_data=72), [
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obj.pk
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],
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attrgetter("pk")
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)
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def test_concrete_abstract_concrete_pk(self):
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"""
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Primary key set correctly with concrete->abstract->concrete inheritance.
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"""
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# Regression test for #13987: Primary key is incorrectly determined
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# when more than one model has a concrete->abstract->concrete
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# inheritance hierarchy.
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self.assertEqual(
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len([field for field in BusStation._meta.local_fields
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if field.primary_key]),
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1
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)
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self.assertEqual(
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len([field for field in TrainStation._meta.local_fields
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if field.primary_key]),
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1
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)
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self.assertIs(BusStation._meta.pk.model, BusStation)
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self.assertIs(TrainStation._meta.pk.model, TrainStation)
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def test_inherited_unique_field_with_form(self):
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"""
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Test that a model which has different primary key for the parent model
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passes unique field checking correctly. Refs #17615.
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"""
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class ProfileForm(forms.ModelForm):
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class Meta:
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model = Profile
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fields = '__all__'
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User.objects.create(username="user_only")
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p = Profile.objects.create(username="user_with_profile")
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form = ProfileForm({'username': "user_with_profile", 'extra': "hello"},
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instance=p)
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self.assertTrue(form.is_valid())
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def test_inheritance_joins(self):
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# Test for #17502 - check that filtering through two levels of
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# inheritance chain doesn't generate extra joins.
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qs = ItalianRestaurant.objects.all()
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self.assertEqual(str(qs.query).count('JOIN'), 2)
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qs = ItalianRestaurant.objects.filter(name='foo')
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self.assertEqual(str(qs.query).count('JOIN'), 2)
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@expectedFailure
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def test_inheritance_values_joins(self):
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# It would be nice (but not too important) to skip the middle join in
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# this case. Skipping is possible as nothing from the middle model is
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# used in the qs and top contains direct pointer to the bottom model.
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qs = ItalianRestaurant.objects.values_list('serves_gnocchi').filter(name='foo')
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self.assertEqual(str(qs.query).count('JOIN'), 1)
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