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470 lines
16 KiB
Python
470 lines
16 KiB
Python
from datetime import datetime
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from operator import attrgetter
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from django.test import TestCase
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from .models import (
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CustomMembership, Employee, Event, Friendship, Group, Ingredient,
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Invitation, Membership, Person, PersonSelfRefM2M, Recipe, RecipeIngredient,
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Relationship,
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)
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class M2mThroughTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.bob = Person.objects.create(name='Bob')
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cls.jim = Person.objects.create(name='Jim')
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cls.jane = Person.objects.create(name='Jane')
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cls.rock = Group.objects.create(name='Rock')
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cls.roll = Group.objects.create(name='Roll')
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def test_retrieve_intermediate_items(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(person=self.jane, group=self.rock)
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expected = ['Jane', 'Jim']
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self.assertQuerysetEqual(
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self.rock.members.all(),
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expected,
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attrgetter("name")
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)
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def test_get_on_intermediate_model(self):
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Membership.objects.create(person=self.jane, group=self.rock)
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queryset = Membership.objects.get(person=self.jane, group=self.rock)
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self.assertEqual(
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repr(queryset),
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'<Membership: Jane is a member of Rock>'
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)
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def test_filter_on_intermediate_model(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(person=self.jane, group=self.rock)
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queryset = Membership.objects.filter(group=self.rock)
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expected = [
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'<Membership: Jim is a member of Rock>',
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'<Membership: Jane is a member of Rock>',
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]
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self.assertQuerysetEqual(
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queryset,
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expected
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)
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def test_cannot_use_add_on_m2m_with_intermediary_model(self):
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msg = 'Cannot use add() on a ManyToManyField which specifies an intermediary model'
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with self.assertRaisesMessage(AttributeError, msg):
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self.rock.members.add(self.bob)
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self.assertQuerysetEqual(
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self.rock.members.all(),
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[]
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)
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def test_cannot_use_create_on_m2m_with_intermediary_model(self):
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msg = 'Cannot use create() on a ManyToManyField which specifies an intermediary model'
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with self.assertRaisesMessage(AttributeError, msg):
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self.rock.members.create(name='Annie')
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self.assertQuerysetEqual(
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self.rock.members.all(),
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[]
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)
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def test_cannot_use_remove_on_m2m_with_intermediary_model(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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msg = 'Cannot use remove() on a ManyToManyField which specifies an intermediary model'
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with self.assertRaisesMessage(AttributeError, msg):
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self.rock.members.remove(self.jim)
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self.assertQuerysetEqual(
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self.rock.members.all(),
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['Jim'],
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attrgetter("name")
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)
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def test_cannot_use_setattr_on_m2m_with_intermediary_model(self):
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msg = 'Cannot set values on a ManyToManyField which specifies an intermediary model'
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members = list(Person.objects.filter(name__in=['Bob', 'Jim']))
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with self.assertRaisesMessage(AttributeError, msg):
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self.rock.members.set(members)
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self.assertQuerysetEqual(
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self.rock.members.all(),
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[]
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)
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def test_clear_removes_all_the_m2m_relationships(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(person=self.jane, group=self.rock)
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self.rock.members.clear()
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self.assertQuerysetEqual(
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self.rock.members.all(),
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[]
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)
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def test_retrieve_reverse_intermediate_items(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(person=self.jim, group=self.roll)
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expected = ['Rock', 'Roll']
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self.assertQuerysetEqual(
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self.jim.group_set.all(),
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expected,
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attrgetter("name")
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)
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def test_cannot_use_add_on_reverse_m2m_with_intermediary_model(self):
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msg = 'Cannot use add() on a ManyToManyField which specifies an intermediary model'
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with self.assertRaisesMessage(AttributeError, msg):
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self.bob.group_set.add(self.bob)
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self.assertQuerysetEqual(
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self.bob.group_set.all(),
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[]
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)
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def test_cannot_use_create_on_reverse_m2m_with_intermediary_model(self):
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msg = 'Cannot use create() on a ManyToManyField which specifies an intermediary model'
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with self.assertRaisesMessage(AttributeError, msg):
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self.bob.group_set.create(name='Funk')
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self.assertQuerysetEqual(
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self.bob.group_set.all(),
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[]
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)
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def test_cannot_use_remove_on_reverse_m2m_with_intermediary_model(self):
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Membership.objects.create(person=self.bob, group=self.rock)
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msg = 'Cannot use remove() on a ManyToManyField which specifies an intermediary model'
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with self.assertRaisesMessage(AttributeError, msg):
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self.bob.group_set.remove(self.rock)
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self.assertQuerysetEqual(
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self.bob.group_set.all(),
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['Rock'],
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attrgetter('name')
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)
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def test_cannot_use_setattr_on_reverse_m2m_with_intermediary_model(self):
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msg = 'Cannot set values on a ManyToManyField which specifies an intermediary model'
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members = list(Group.objects.filter(name__in=['Rock', 'Roll']))
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with self.assertRaisesMessage(AttributeError, msg):
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self.bob.group_set.set(members)
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self.assertQuerysetEqual(
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self.bob.group_set.all(),
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[]
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)
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def test_clear_on_reverse_removes_all_the_m2m_relationships(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(person=self.jim, group=self.roll)
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self.jim.group_set.clear()
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self.assertQuerysetEqual(
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self.jim.group_set.all(),
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[]
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)
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def test_query_model_by_attribute_name_of_related_model(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(person=self.jane, group=self.rock)
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Membership.objects.create(person=self.bob, group=self.roll)
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Membership.objects.create(person=self.jim, group=self.roll)
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Membership.objects.create(person=self.jane, group=self.roll)
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self.assertQuerysetEqual(
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Group.objects.filter(members__name='Bob'),
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['Roll'],
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attrgetter("name")
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)
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def test_order_by_relational_field_through_model(self):
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CustomMembership.objects.create(person=self.jim, group=self.rock)
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CustomMembership.objects.create(person=self.bob, group=self.rock)
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CustomMembership.objects.create(person=self.jane, group=self.roll)
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CustomMembership.objects.create(person=self.jim, group=self.roll)
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self.assertSequenceEqual(
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self.rock.custom_members.order_by('custom_person_related_name'),
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[self.jim, self.bob]
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)
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self.assertSequenceEqual(
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self.roll.custom_members.order_by('custom_person_related_name'),
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[self.jane, self.jim]
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)
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def test_query_first_model_by_intermediate_model_attribute(self):
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Membership.objects.create(
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person=self.jane, group=self.roll,
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invite_reason="She was just awesome."
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)
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Membership.objects.create(
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person=self.jim, group=self.roll,
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invite_reason="He is good."
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)
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Membership.objects.create(person=self.bob, group=self.roll)
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qs = Group.objects.filter(
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membership__invite_reason="She was just awesome."
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)
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self.assertQuerysetEqual(
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qs,
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['Roll'],
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attrgetter("name")
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)
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def test_query_second_model_by_intermediate_model_attribute(self):
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Membership.objects.create(
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person=self.jane, group=self.roll,
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invite_reason="She was just awesome."
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)
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Membership.objects.create(
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person=self.jim, group=self.roll,
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invite_reason="He is good."
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)
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Membership.objects.create(person=self.bob, group=self.roll)
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qs = Person.objects.filter(
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membership__invite_reason="She was just awesome."
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)
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self.assertQuerysetEqual(
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qs,
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['Jane'],
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attrgetter("name")
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)
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def test_query_model_by_related_model_name(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(person=self.jane, group=self.rock)
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Membership.objects.create(person=self.bob, group=self.roll)
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Membership.objects.create(person=self.jim, group=self.roll)
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Membership.objects.create(person=self.jane, group=self.roll)
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self.assertQuerysetEqual(
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Person.objects.filter(group__name="Rock"),
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['Jane', 'Jim'],
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attrgetter("name")
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)
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def test_query_model_by_custom_related_name(self):
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CustomMembership.objects.create(person=self.bob, group=self.rock)
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CustomMembership.objects.create(person=self.jim, group=self.rock)
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self.assertQuerysetEqual(
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Person.objects.filter(custom__name="Rock"),
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['Bob', 'Jim'],
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attrgetter("name")
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)
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def test_query_model_by_intermediate_can_return_non_unique_queryset(self):
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Membership.objects.create(person=self.jim, group=self.rock)
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Membership.objects.create(
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person=self.jane, group=self.rock,
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date_joined=datetime(2006, 1, 1)
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)
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Membership.objects.create(
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person=self.bob, group=self.roll,
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date_joined=datetime(2004, 1, 1))
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Membership.objects.create(person=self.jim, group=self.roll)
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Membership.objects.create(
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person=self.jane, group=self.roll,
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date_joined=datetime(2004, 1, 1))
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qs = Person.objects.filter(
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membership__date_joined__gt=datetime(2004, 1, 1)
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)
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self.assertQuerysetEqual(
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qs,
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['Jane', 'Jim', 'Jim'],
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attrgetter("name")
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)
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def test_custom_related_name_forward_empty_qs(self):
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self.assertQuerysetEqual(
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self.rock.custom_members.all(),
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[]
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)
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def test_custom_related_name_reverse_empty_qs(self):
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self.assertQuerysetEqual(
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self.bob.custom.all(),
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[]
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)
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def test_custom_related_name_forward_non_empty_qs(self):
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CustomMembership.objects.create(person=self.bob, group=self.rock)
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CustomMembership.objects.create(person=self.jim, group=self.rock)
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self.assertQuerysetEqual(
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self.rock.custom_members.all(),
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['Bob', 'Jim'],
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attrgetter("name")
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)
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def test_custom_related_name_reverse_non_empty_qs(self):
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CustomMembership.objects.create(person=self.bob, group=self.rock)
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CustomMembership.objects.create(person=self.jim, group=self.rock)
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self.assertQuerysetEqual(
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self.bob.custom.all(),
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['Rock'],
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attrgetter("name")
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)
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def test_custom_related_name_doesnt_conflict_with_fky_related_name(self):
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CustomMembership.objects.create(person=self.bob, group=self.rock)
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self.assertQuerysetEqual(
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self.bob.custom_person_related_name.all(),
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['<CustomMembership: Bob is a member of Rock>']
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)
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def test_through_fields(self):
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"""
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Relations with intermediary tables with multiple FKs
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to the M2M's ``to`` model are possible.
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"""
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event = Event.objects.create(title='Rockwhale 2014')
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Invitation.objects.create(event=event, inviter=self.bob, invitee=self.jim)
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Invitation.objects.create(event=event, inviter=self.bob, invitee=self.jane)
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self.assertQuerysetEqual(
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event.invitees.all(),
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['Jane', 'Jim'],
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attrgetter('name')
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)
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class M2mThroughReferentialTests(TestCase):
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def test_self_referential_empty_qs(self):
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tony = PersonSelfRefM2M.objects.create(name="Tony")
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self.assertQuerysetEqual(
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tony.friends.all(),
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[]
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)
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def test_self_referential_non_symmetrical_first_side(self):
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tony = PersonSelfRefM2M.objects.create(name="Tony")
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chris = PersonSelfRefM2M.objects.create(name="Chris")
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Friendship.objects.create(
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first=tony, second=chris, date_friended=datetime.now()
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)
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self.assertQuerysetEqual(
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tony.friends.all(),
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['Chris'],
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attrgetter("name")
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)
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def test_self_referential_non_symmetrical_second_side(self):
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tony = PersonSelfRefM2M.objects.create(name="Tony")
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chris = PersonSelfRefM2M.objects.create(name="Chris")
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Friendship.objects.create(
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first=tony, second=chris, date_friended=datetime.now()
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)
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self.assertQuerysetEqual(
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chris.friends.all(),
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[]
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)
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def test_self_referential_non_symmetrical_clear_first_side(self):
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tony = PersonSelfRefM2M.objects.create(name="Tony")
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chris = PersonSelfRefM2M.objects.create(name="Chris")
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Friendship.objects.create(
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first=tony, second=chris, date_friended=datetime.now()
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)
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chris.friends.clear()
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self.assertQuerysetEqual(
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chris.friends.all(),
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[]
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)
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# Since this isn't a symmetrical relation, Tony's friend link still exists.
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self.assertQuerysetEqual(
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tony.friends.all(),
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['Chris'],
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attrgetter("name")
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)
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def test_self_referential_symmetrical(self):
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tony = PersonSelfRefM2M.objects.create(name="Tony")
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chris = PersonSelfRefM2M.objects.create(name="Chris")
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Friendship.objects.create(
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first=tony, second=chris, date_friended=datetime.now()
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)
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Friendship.objects.create(
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first=chris, second=tony, date_friended=datetime.now()
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)
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self.assertQuerysetEqual(
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tony.friends.all(),
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['Chris'],
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attrgetter("name")
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)
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self.assertQuerysetEqual(
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chris.friends.all(),
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['Tony'],
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attrgetter("name")
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)
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def test_through_fields_self_referential(self):
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john = Employee.objects.create(name='john')
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peter = Employee.objects.create(name='peter')
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mary = Employee.objects.create(name='mary')
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harry = Employee.objects.create(name='harry')
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Relationship.objects.create(source=john, target=peter, another=None)
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Relationship.objects.create(source=john, target=mary, another=None)
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Relationship.objects.create(source=john, target=harry, another=peter)
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self.assertQuerysetEqual(
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john.subordinates.all(),
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['peter', 'mary', 'harry'],
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attrgetter('name')
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)
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class M2mThroughToFieldsTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.pea = Ingredient.objects.create(iname='pea')
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cls.potato = Ingredient.objects.create(iname='potato')
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cls.tomato = Ingredient.objects.create(iname='tomato')
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cls.curry = Recipe.objects.create(rname='curry')
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RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.potato)
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RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.pea)
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RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.tomato)
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def test_retrieval(self):
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# Forward retrieval
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self.assertSequenceEqual(self.curry.ingredients.all(), [self.pea, self.potato, self.tomato])
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# Backward retrieval
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self.assertEqual(self.tomato.recipes.get(), self.curry)
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def test_choices(self):
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field = Recipe._meta.get_field('ingredients')
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self.assertEqual(
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[choice[0] for choice in field.get_choices(include_blank=False)],
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['pea', 'potato', 'tomato']
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)
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