django/tests/m2m_through/tests.py

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from __future__ import unicode_literals
from datetime import datetime
from operator import attrgetter
from django.test import TestCase, skipUnlessDBFeature
from .models import (
CustomMembership, Employee, Event, Friendship, Group, Ingredient,
Invitation, Membership, Person, PersonSelfRefM2M, Recipe, RecipeIngredient,
Relationship,
)
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_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):
Membership.objects.create(person=self.jim, group=self.rock)
Membership.objects.create(person=self.jane, group=self.rock)
queryset = Membership.objects.filter(group=self.rock)
expected = [
'<Membership: Jim is a member of Rock>',
'<Membership: Jane is a member of Rock>',
]
self.assertQuerysetEqual(
queryset,
expected
)
def test_cannot_use_add_on_m2m_with_intermediary_model(self):
msg = 'Cannot use add() on a ManyToManyField which specifies an intermediary model'
with self.assertRaisesMessage(AttributeError, msg):
self.rock.members.add(self.bob)
self.assertQuerysetEqual(
self.rock.members.all(),
[]
)
def test_cannot_use_create_on_m2m_with_intermediary_model(self):
msg = 'Cannot use create() on a ManyToManyField which specifies an intermediary model'
with self.assertRaisesMessage(AttributeError, msg):
self.rock.members.create(name='Annie')
self.assertQuerysetEqual(
self.rock.members.all(),
[]
)
def test_cannot_use_remove_on_m2m_with_intermediary_model(self):
Membership.objects.create(person=self.jim, group=self.rock)
msg = 'Cannot use remove() on a ManyToManyField which specifies an intermediary model'
with self.assertRaisesMessage(AttributeError, msg):
self.rock.members.remove(self.jim)
self.assertQuerysetEqual(
self.rock.members.all(),
['Jim', ],
attrgetter("name")
)
def test_cannot_use_setattr_on_m2m_with_intermediary_model(self):
msg = 'Cannot set values on a ManyToManyField which specifies an intermediary model'
members = list(Person.objects.filter(name__in=['Bob', 'Jim']))
with self.assertRaisesMessage(AttributeError, msg):
self.rock.members.set(members)
self.assertQuerysetEqual(
self.rock.members.all(),
[]
)
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_cannot_use_add_on_reverse_m2m_with_intermediary_model(self):
msg = 'Cannot use add() on a ManyToManyField which specifies an intermediary model'
with self.assertRaisesMessage(AttributeError, msg):
self.bob.group_set.add(self.bob)
self.assertQuerysetEqual(
self.bob.group_set.all(),
[]
)
def test_cannot_use_create_on_reverse_m2m_with_intermediary_model(self):
msg = 'Cannot use create() on a ManyToManyField which specifies an intermediary model'
with self.assertRaisesMessage(AttributeError, msg):
self.bob.group_set.create(name='Funk')
self.assertQuerysetEqual(
self.bob.group_set.all(),
[]
)
def test_cannot_use_remove_on_reverse_m2m_with_intermediary_model(self):
Membership.objects.create(person=self.bob, group=self.rock)
msg = 'Cannot use remove() on a ManyToManyField which specifies an intermediary model'
with self.assertRaisesMessage(AttributeError, msg):
self.bob.group_set.remove(self.rock)
self.assertQuerysetEqual(
self.bob.group_set.all(),
['Rock', ],
attrgetter('name')
)
def test_cannot_use_setattr_on_reverse_m2m_with_intermediary_model(self):
msg = 'Cannot set values on a ManyToManyField which specifies an intermediary model'
members = list(Group.objects.filter(name__in=['Rock', 'Roll']))
with self.assertRaisesMessage(AttributeError, msg):
self.bob.group_set.set(members)
self.assertQuerysetEqual(
self.bob.group_set.all(),
[]
)
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")
)
@skipUnlessDBFeature('supports_microsecond_precision')
def test_order_by_relational_field_through_model(self):
CustomMembership.objects.create(person=self.jim, group=self.rock)
CustomMembership.objects.create(person=self.bob, group=self.rock)
CustomMembership.objects.create(person=self.jane, group=self.roll)
CustomMembership.objects.create(person=self.jim, group=self.roll)
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):
CustomMembership.objects.create(person=self.bob, group=self.rock)
self.assertQuerysetEqual(
self.bob.custom_person_related_name.all(),
['<CustomMembership: Bob is a member of Rock>']
)
def test_through_fields(self):
"""
Tests that 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_symmetrical(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')
)
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']
)