from datetime import date, datetime, timedelta from operator import attrgetter from django.db import IntegrityError from django.test import TestCase from .models import ( CustomMembership, Employee, Event, Friendship, Group, Ingredient, Invitation, Membership, Person, PersonChild, PersonSelfRefM2M, Recipe, RecipeIngredient, Relationship, SymmetricalFriendship, ) class M2mThroughTests(TestCase): @classmethod def setUpTestData(cls): cls.bob = Person.objects.create(name="Bob") cls.jim = Person.objects.create(name="Jim") cls.jane = Person.objects.create(name="Jane") cls.rock = Group.objects.create(name="Rock") cls.roll = Group.objects.create(name="Roll") def test_reverse_inherited_m2m_with_through_fields_list_hashable(self): reverse_m2m = Person._meta.get_field("events_invited") self.assertEqual(reverse_m2m.through_fields, ["event", "invitee"]) inherited_reverse_m2m = PersonChild._meta.get_field("events_invited") self.assertEqual(inherited_reverse_m2m.through_fields, ["event", "invitee"]) self.assertEqual(hash(reverse_m2m), hash(inherited_reverse_m2m)) def test_retrieve_intermediate_items(self): Membership.objects.create(person=self.jim, group=self.rock) Membership.objects.create(person=self.jane, group=self.rock) expected = ["Jane", "Jim"] self.assertQuerysetEqual(self.rock.members.all(), expected, attrgetter("name")) def test_get_on_intermediate_model(self): Membership.objects.create(person=self.jane, group=self.rock) queryset = Membership.objects.get(person=self.jane, group=self.rock) self.assertEqual(repr(queryset), "") def test_filter_on_intermediate_model(self): m1 = Membership.objects.create(person=self.jim, group=self.rock) m2 = Membership.objects.create(person=self.jane, group=self.rock) queryset = Membership.objects.filter(group=self.rock) self.assertSequenceEqual(queryset, [m1, m2]) def test_add_on_m2m_with_intermediate_model(self): self.rock.members.add( self.bob, through_defaults={"invite_reason": "He is good."} ) self.assertSequenceEqual(self.rock.members.all(), [self.bob]) self.assertEqual(self.rock.membership_set.get().invite_reason, "He is good.") def test_add_on_m2m_with_intermediate_model_callable_through_default(self): def invite_reason_callable(): return "They were good at %s" % datetime.now() self.rock.members.add( self.bob, self.jane, through_defaults={"invite_reason": invite_reason_callable}, ) self.assertSequenceEqual(self.rock.members.all(), [self.bob, self.jane]) self.assertEqual( self.rock.membership_set.filter( invite_reason__startswith="They were good at ", ).count(), 2, ) # invite_reason_callable() is called once. self.assertEqual( self.bob.membership_set.get().invite_reason, self.jane.membership_set.get().invite_reason, ) def test_set_on_m2m_with_intermediate_model_callable_through_default(self): self.rock.members.set( [self.bob, self.jane], through_defaults={"invite_reason": lambda: "Why not?"}, ) self.assertSequenceEqual(self.rock.members.all(), [self.bob, self.jane]) self.assertEqual( self.rock.membership_set.filter( invite_reason__startswith="Why not?", ).count(), 2, ) def test_add_on_m2m_with_intermediate_model_value_required(self): self.rock.nodefaultsnonulls.add( self.jim, through_defaults={"nodefaultnonull": 1} ) self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1) def test_add_on_m2m_with_intermediate_model_value_required_fails(self): with self.assertRaises(IntegrityError): self.rock.nodefaultsnonulls.add(self.jim) def test_create_on_m2m_with_intermediate_model(self): annie = self.rock.members.create( name="Annie", through_defaults={"invite_reason": "She was just awesome."} ) self.assertSequenceEqual(self.rock.members.all(), [annie]) self.assertEqual( self.rock.membership_set.get().invite_reason, "She was just awesome." ) def test_create_on_m2m_with_intermediate_model_callable_through_default(self): annie = self.rock.members.create( name="Annie", through_defaults={"invite_reason": lambda: "She was just awesome."}, ) self.assertSequenceEqual(self.rock.members.all(), [annie]) self.assertEqual( self.rock.membership_set.get().invite_reason, "She was just awesome.", ) def test_create_on_m2m_with_intermediate_model_value_required(self): self.rock.nodefaultsnonulls.create( name="Test", through_defaults={"nodefaultnonull": 1} ) self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1) def test_create_on_m2m_with_intermediate_model_value_required_fails(self): with self.assertRaises(IntegrityError): self.rock.nodefaultsnonulls.create(name="Test") def test_get_or_create_on_m2m_with_intermediate_model_value_required(self): self.rock.nodefaultsnonulls.get_or_create( name="Test", through_defaults={"nodefaultnonull": 1} ) self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1) def test_get_or_create_on_m2m_with_intermediate_model_value_required_fails(self): with self.assertRaises(IntegrityError): self.rock.nodefaultsnonulls.get_or_create(name="Test") def test_update_or_create_on_m2m_with_intermediate_model_value_required(self): self.rock.nodefaultsnonulls.update_or_create( name="Test", through_defaults={"nodefaultnonull": 1} ) self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1) def test_update_or_create_on_m2m_with_intermediate_model_value_required_fails(self): with self.assertRaises(IntegrityError): self.rock.nodefaultsnonulls.update_or_create(name="Test") def test_remove_on_m2m_with_intermediate_model(self): Membership.objects.create(person=self.jim, group=self.rock) self.rock.members.remove(self.jim) self.assertSequenceEqual(self.rock.members.all(), []) def test_remove_on_m2m_with_intermediate_model_multiple(self): Membership.objects.create(person=self.jim, group=self.rock, invite_reason="1") Membership.objects.create(person=self.jim, group=self.rock, invite_reason="2") self.assertSequenceEqual(self.rock.members.all(), [self.jim, self.jim]) self.rock.members.remove(self.jim) self.assertSequenceEqual(self.rock.members.all(), []) def test_set_on_m2m_with_intermediate_model(self): members = list(Person.objects.filter(name__in=["Bob", "Jim"])) self.rock.members.set(members) self.assertSequenceEqual(self.rock.members.all(), [self.bob, self.jim]) def test_set_on_m2m_with_intermediate_model_value_required(self): self.rock.nodefaultsnonulls.set( [self.jim], through_defaults={"nodefaultnonull": 1} ) self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1) self.rock.nodefaultsnonulls.set( [self.jim], through_defaults={"nodefaultnonull": 2} ) self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1) self.rock.nodefaultsnonulls.set( [self.jim], through_defaults={"nodefaultnonull": 2}, clear=True ) self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 2) def test_set_on_m2m_with_intermediate_model_value_required_fails(self): with self.assertRaises(IntegrityError): self.rock.nodefaultsnonulls.set([self.jim]) def test_clear_removes_all_the_m2m_relationships(self): Membership.objects.create(person=self.jim, group=self.rock) Membership.objects.create(person=self.jane, group=self.rock) self.rock.members.clear() self.assertQuerysetEqual(self.rock.members.all(), []) def test_retrieve_reverse_intermediate_items(self): Membership.objects.create(person=self.jim, group=self.rock) Membership.objects.create(person=self.jim, group=self.roll) expected = ["Rock", "Roll"] self.assertQuerysetEqual(self.jim.group_set.all(), expected, attrgetter("name")) def test_add_on_reverse_m2m_with_intermediate_model(self): self.bob.group_set.add(self.rock) self.assertSequenceEqual(self.bob.group_set.all(), [self.rock]) def test_create_on_reverse_m2m_with_intermediate_model(self): funk = self.bob.group_set.create(name="Funk") self.assertSequenceEqual(self.bob.group_set.all(), [funk]) def test_remove_on_reverse_m2m_with_intermediate_model(self): Membership.objects.create(person=self.bob, group=self.rock) self.bob.group_set.remove(self.rock) self.assertSequenceEqual(self.bob.group_set.all(), []) def test_set_on_reverse_m2m_with_intermediate_model(self): members = list(Group.objects.filter(name__in=["Rock", "Roll"])) self.bob.group_set.set(members) self.assertSequenceEqual(self.bob.group_set.all(), [self.rock, self.roll]) def test_clear_on_reverse_removes_all_the_m2m_relationships(self): Membership.objects.create(person=self.jim, group=self.rock) Membership.objects.create(person=self.jim, group=self.roll) self.jim.group_set.clear() self.assertQuerysetEqual(self.jim.group_set.all(), []) def test_query_model_by_attribute_name_of_related_model(self): Membership.objects.create(person=self.jim, group=self.rock) Membership.objects.create(person=self.jane, group=self.rock) Membership.objects.create(person=self.bob, group=self.roll) Membership.objects.create(person=self.jim, group=self.roll) Membership.objects.create(person=self.jane, group=self.roll) self.assertQuerysetEqual( Group.objects.filter(members__name="Bob"), ["Roll"], attrgetter("name") ) def test_order_by_relational_field_through_model(self): today = datetime.now() yesterday = today - timedelta(days=1) CustomMembership.objects.create( person=self.jim, group=self.rock, date_joined=yesterday ) CustomMembership.objects.create( person=self.bob, group=self.rock, date_joined=today ) CustomMembership.objects.create( person=self.jane, group=self.roll, date_joined=yesterday ) CustomMembership.objects.create( person=self.jim, group=self.roll, date_joined=today ) self.assertSequenceEqual( self.rock.custom_members.order_by("custom_person_related_name"), [self.jim, self.bob], ) self.assertSequenceEqual( self.roll.custom_members.order_by("custom_person_related_name"), [self.jane, self.jim], ) def test_query_first_model_by_intermediate_model_attribute(self): Membership.objects.create( person=self.jane, group=self.roll, invite_reason="She was just awesome." ) Membership.objects.create( person=self.jim, group=self.roll, invite_reason="He is good." ) Membership.objects.create(person=self.bob, group=self.roll) qs = Group.objects.filter(membership__invite_reason="She was just awesome.") self.assertQuerysetEqual(qs, ["Roll"], attrgetter("name")) def test_query_second_model_by_intermediate_model_attribute(self): Membership.objects.create( person=self.jane, group=self.roll, invite_reason="She was just awesome." ) Membership.objects.create( person=self.jim, group=self.roll, invite_reason="He is good." ) Membership.objects.create(person=self.bob, group=self.roll) qs = Person.objects.filter(membership__invite_reason="She was just awesome.") self.assertQuerysetEqual(qs, ["Jane"], attrgetter("name")) def test_query_model_by_related_model_name(self): Membership.objects.create(person=self.jim, group=self.rock) Membership.objects.create(person=self.jane, group=self.rock) Membership.objects.create(person=self.bob, group=self.roll) Membership.objects.create(person=self.jim, group=self.roll) Membership.objects.create(person=self.jane, group=self.roll) self.assertQuerysetEqual( Person.objects.filter(group__name="Rock"), ["Jane", "Jim"], attrgetter("name"), ) def test_query_model_by_custom_related_name(self): CustomMembership.objects.create(person=self.bob, group=self.rock) CustomMembership.objects.create(person=self.jim, group=self.rock) self.assertQuerysetEqual( Person.objects.filter(custom__name="Rock"), ["Bob", "Jim"], attrgetter("name"), ) def test_query_model_by_intermediate_can_return_non_unique_queryset(self): Membership.objects.create(person=self.jim, group=self.rock) Membership.objects.create( person=self.jane, group=self.rock, date_joined=datetime(2006, 1, 1) ) Membership.objects.create( person=self.bob, group=self.roll, date_joined=datetime(2004, 1, 1) ) Membership.objects.create(person=self.jim, group=self.roll) Membership.objects.create( person=self.jane, group=self.roll, date_joined=datetime(2004, 1, 1) ) qs = Person.objects.filter(membership__date_joined__gt=datetime(2004, 1, 1)) self.assertQuerysetEqual(qs, ["Jane", "Jim", "Jim"], attrgetter("name")) def test_custom_related_name_forward_empty_qs(self): self.assertQuerysetEqual(self.rock.custom_members.all(), []) def test_custom_related_name_reverse_empty_qs(self): self.assertQuerysetEqual(self.bob.custom.all(), []) def test_custom_related_name_forward_non_empty_qs(self): CustomMembership.objects.create(person=self.bob, group=self.rock) CustomMembership.objects.create(person=self.jim, group=self.rock) self.assertQuerysetEqual( self.rock.custom_members.all(), ["Bob", "Jim"], attrgetter("name") ) def test_custom_related_name_reverse_non_empty_qs(self): CustomMembership.objects.create(person=self.bob, group=self.rock) CustomMembership.objects.create(person=self.jim, group=self.rock) self.assertQuerysetEqual(self.bob.custom.all(), ["Rock"], attrgetter("name")) def test_custom_related_name_doesnt_conflict_with_fky_related_name(self): c = CustomMembership.objects.create(person=self.bob, group=self.rock) self.assertSequenceEqual(self.bob.custom_person_related_name.all(), [c]) def test_through_fields(self): """ Relations with intermediary tables with multiple FKs to the M2M's ``to`` model are possible. """ event = Event.objects.create(title="Rockwhale 2014") Invitation.objects.create(event=event, inviter=self.bob, invitee=self.jim) Invitation.objects.create(event=event, inviter=self.bob, invitee=self.jane) self.assertQuerysetEqual( event.invitees.all(), ["Jane", "Jim"], attrgetter("name") ) class M2mThroughReferentialTests(TestCase): def test_self_referential_empty_qs(self): tony = PersonSelfRefM2M.objects.create(name="Tony") self.assertQuerysetEqual(tony.friends.all(), []) def test_self_referential_non_symmetrical_first_side(self): tony = PersonSelfRefM2M.objects.create(name="Tony") chris = PersonSelfRefM2M.objects.create(name="Chris") Friendship.objects.create( first=tony, second=chris, date_friended=datetime.now() ) self.assertQuerysetEqual(tony.friends.all(), ["Chris"], attrgetter("name")) def test_self_referential_non_symmetrical_second_side(self): tony = PersonSelfRefM2M.objects.create(name="Tony") chris = PersonSelfRefM2M.objects.create(name="Chris") Friendship.objects.create( first=tony, second=chris, date_friended=datetime.now() ) self.assertQuerysetEqual(chris.friends.all(), []) def test_self_referential_non_symmetrical_clear_first_side(self): tony = PersonSelfRefM2M.objects.create(name="Tony") chris = PersonSelfRefM2M.objects.create(name="Chris") Friendship.objects.create( first=tony, second=chris, date_friended=datetime.now() ) chris.friends.clear() self.assertQuerysetEqual(chris.friends.all(), []) # Since this isn't a symmetrical relation, Tony's friend link still exists. self.assertQuerysetEqual(tony.friends.all(), ["Chris"], attrgetter("name")) def test_self_referential_non_symmetrical_both(self): tony = PersonSelfRefM2M.objects.create(name="Tony") chris = PersonSelfRefM2M.objects.create(name="Chris") Friendship.objects.create( first=tony, second=chris, date_friended=datetime.now() ) Friendship.objects.create( first=chris, second=tony, date_friended=datetime.now() ) self.assertQuerysetEqual(tony.friends.all(), ["Chris"], attrgetter("name")) self.assertQuerysetEqual(chris.friends.all(), ["Tony"], attrgetter("name")) def test_through_fields_self_referential(self): john = Employee.objects.create(name="john") peter = Employee.objects.create(name="peter") mary = Employee.objects.create(name="mary") harry = Employee.objects.create(name="harry") Relationship.objects.create(source=john, target=peter, another=None) Relationship.objects.create(source=john, target=mary, another=None) Relationship.objects.create(source=john, target=harry, another=peter) self.assertQuerysetEqual( john.subordinates.all(), ["peter", "mary", "harry"], attrgetter("name") ) def test_self_referential_symmetrical(self): tony = PersonSelfRefM2M.objects.create(name="Tony") chris = PersonSelfRefM2M.objects.create(name="Chris") SymmetricalFriendship.objects.create( first=tony, second=chris, date_friended=date.today(), ) self.assertSequenceEqual(tony.sym_friends.all(), [chris]) # Manually created symmetrical m2m relation doesn't add mirror entry # automatically. self.assertSequenceEqual(chris.sym_friends.all(), []) SymmetricalFriendship.objects.create( first=chris, second=tony, date_friended=date.today() ) self.assertSequenceEqual(chris.sym_friends.all(), [tony]) def test_add_on_symmetrical_m2m_with_intermediate_model(self): tony = PersonSelfRefM2M.objects.create(name="Tony") chris = PersonSelfRefM2M.objects.create(name="Chris") date_friended = date(2017, 1, 3) tony.sym_friends.add(chris, through_defaults={"date_friended": date_friended}) self.assertSequenceEqual(tony.sym_friends.all(), [chris]) self.assertSequenceEqual(chris.sym_friends.all(), [tony]) friendship = tony.symmetricalfriendship_set.get() self.assertEqual(friendship.date_friended, date_friended) def test_set_on_symmetrical_m2m_with_intermediate_model(self): tony = PersonSelfRefM2M.objects.create(name="Tony") chris = PersonSelfRefM2M.objects.create(name="Chris") anne = PersonSelfRefM2M.objects.create(name="Anne") kate = PersonSelfRefM2M.objects.create(name="Kate") date_friended_add = date(2013, 1, 5) date_friended_set = date.today() tony.sym_friends.add( anne, chris, through_defaults={"date_friended": date_friended_add}, ) tony.sym_friends.set( [anne, kate], through_defaults={"date_friended": date_friended_set}, ) self.assertSequenceEqual(tony.sym_friends.all(), [anne, kate]) self.assertSequenceEqual(anne.sym_friends.all(), [tony]) self.assertSequenceEqual(kate.sym_friends.all(), [tony]) self.assertEqual( kate.symmetricalfriendship_set.get().date_friended, date_friended_set, ) # Date is preserved. self.assertEqual( anne.symmetricalfriendship_set.get().date_friended, date_friended_add, ) # Recreate relationship. tony.sym_friends.set( [anne], clear=True, through_defaults={"date_friended": date_friended_set}, ) self.assertSequenceEqual(tony.sym_friends.all(), [anne]) self.assertSequenceEqual(anne.sym_friends.all(), [tony]) self.assertEqual( anne.symmetricalfriendship_set.get().date_friended, date_friended_set, ) class M2mThroughToFieldsTests(TestCase): @classmethod def setUpTestData(cls): cls.pea = Ingredient.objects.create(iname="pea") cls.potato = Ingredient.objects.create(iname="potato") cls.tomato = Ingredient.objects.create(iname="tomato") cls.curry = Recipe.objects.create(rname="curry") RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.potato) RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.pea) RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.tomato) def test_retrieval(self): # Forward retrieval self.assertSequenceEqual( self.curry.ingredients.all(), [self.pea, self.potato, self.tomato] ) # Backward retrieval self.assertEqual(self.tomato.recipes.get(), self.curry) def test_choices(self): field = Recipe._meta.get_field("ingredients") self.assertEqual( [choice[0] for choice in field.get_choices(include_blank=False)], ["pea", "potato", "tomato"], )