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), "<Membership: Jane is a member of Rock>")
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"],
)