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from __future__ import unicode_literals
from django.contrib.auth.models import User
from django.core import management
from django.test import TestCase
from django.utils.six import StringIO
from .models import (
Car, CarDriver, Driver, Group, Membership, Person, UserMembership,
)
class M2MThroughTestCase(TestCase):
def test_everything(self):
bob = Person.objects.create(name="Bob")
jim = Person.objects.create(name="Jim")
rock = Group.objects.create(name="Rock")
roll = Group.objects.create(name="Roll")
frank = User.objects.create_user("frank", "frank@example.com", "password")
jane = User.objects.create_user("jane", "jane@example.com", "password")
Membership.objects.create(person=bob, group=rock)
Membership.objects.create(person=bob, group=roll)
Membership.objects.create(person=jim, group=rock)
self.assertQuerysetEqual(
bob.group_set.all(), [
"<Group: Rock>",
"<Group: Roll>",
],
ordered=False
)
self.assertQuerysetEqual(
roll.members.all(), [
"<Person: Bob>",
]
)
self.assertRaises(AttributeError, setattr, bob, "group_set", [])
self.assertRaises(AttributeError, setattr, roll, "members", [])
self.assertRaises(AttributeError, rock.members.create, name="Anne")
self.assertRaises(AttributeError, bob.group_set.create, name="Funk")
UserMembership.objects.create(user=frank, group=rock)
UserMembership.objects.create(user=frank, group=roll)
UserMembership.objects.create(user=jane, group=rock)
self.assertQuerysetEqual(
frank.group_set.all(), [
"<Group: Rock>",
"<Group: Roll>",
],
ordered=False
)
self.assertQuerysetEqual(
roll.user_members.all(), [
"<User: frank>",
]
)
def test_serialization(self):
"m2m-through models aren't serialized as m2m fields. Refs #8134"
p = Person.objects.create(name="Bob")
g = Group.objects.create(name="Roll")
m = Membership.objects.create(person=p, group=g)
pks = {"p_pk": p.pk, "g_pk": g.pk, "m_pk": m.pk}
out = StringIO()
management.call_command("dumpdata", "m2m_through_regress", format="json", stdout=out)
self.assertJSONEqual(out.getvalue().strip(), """[{"pk": %(m_pk)s, "model": "m2m_through_regress.membership", "fields": {"person": %(p_pk)s, "price": 100, "group": %(g_pk)s}}, {"pk": %(p_pk)s, "model": "m2m_through_regress.person", "fields": {"name": "Bob"}}, {"pk": %(g_pk)s, "model": "m2m_through_regress.group", "fields": {"name": "Roll"}}]""" % pks)
out = StringIO()
management.call_command("dumpdata", "m2m_through_regress", format="xml",
indent=2, stdout=out)
self.assertXMLEqual(out.getvalue().strip(), """
<?xml version="1.0" encoding="utf-8"?>
<django-objects version="1.0">
<object pk="%(m_pk)s" model="m2m_through_regress.membership">
<field to="m2m_through_regress.person" name="person" rel="ManyToOneRel">%(p_pk)s</field>
<field to="m2m_through_regress.group" name="group" rel="ManyToOneRel">%(g_pk)s</field>
<field type="IntegerField" name="price">100</field>
</object>
<object pk="%(p_pk)s" model="m2m_through_regress.person">
<field type="CharField" name="name">Bob</field>
</object>
<object pk="%(g_pk)s" model="m2m_through_regress.group">
<field type="CharField" name="name">Roll</field>
</object>
</django-objects>
""".strip() % pks)
def test_join_trimming(self):
"Check that we don't involve too many copies of the intermediate table when doing a join. Refs #8046, #8254"
bob = Person.objects.create(name="Bob")
jim = Person.objects.create(name="Jim")
rock = Group.objects.create(name="Rock")
roll = Group.objects.create(name="Roll")
Membership.objects.create(person=bob, group=rock)
Membership.objects.create(person=jim, group=rock, price=50)
Membership.objects.create(person=bob, group=roll, price=50)
self.assertQuerysetEqual(
rock.members.filter(membership__price=50), [
"<Person: Jim>",
]
)
self.assertQuerysetEqual(
bob.group_set.filter(membership__price=50), [
"<Group: Roll>",
]
)
class ToFieldThroughTests(TestCase):
def setUp(self):
self.car = Car.objects.create(make="Toyota")
self.driver = Driver.objects.create(name="Ryan Briscoe")
CarDriver.objects.create(car=self.car, driver=self.driver)
# We are testing if wrong objects get deleted due to using wrong
# field value in m2m queries. So, it is essential that the pk
# numberings do not match.
# Create one intentionally unused driver to mix up the autonumbering
self.unused_driver = Driver.objects.create(name="Barney Gumble")
# And two intentionally unused cars.
self.unused_car1 = Car.objects.create(make="Trabant")
self.unused_car2 = Car.objects.create(make="Wartburg")
def test_to_field(self):
self.assertQuerysetEqual(
self.car.drivers.all(),
["<Driver: Ryan Briscoe>"]
)
def test_to_field_reverse(self):
self.assertQuerysetEqual(
self.driver.car_set.all(),
["<Car: Toyota>"]
)
def test_to_field_clear_reverse(self):
self.driver.car_set.clear()
self.assertQuerysetEqual(
self.driver.car_set.all(), [])
def test_to_field_clear(self):
self.car.drivers.clear()
self.assertQuerysetEqual(
self.car.drivers.all(), [])
# Low level tests for _add_items and _remove_items. We test these methods
# because .add/.remove aren't available for m2m fields with through, but
# through is the only way to set to_field currently. We do want to make
# sure these methods are ready if the ability to use .add or .remove with
# to_field relations is added some day.
def test_add(self):
self.assertQuerysetEqual(
self.car.drivers.all(),
["<Driver: Ryan Briscoe>"]
)
# Yikes - barney is going to drive...
self.car.drivers._add_items('car', 'driver', self.unused_driver)
self.assertQuerysetEqual(
self.car.drivers.all(),
["<Driver: Barney Gumble>", "<Driver: Ryan Briscoe>"]
)
def test_add_null(self):
nullcar = Car.objects.create(make=None)
with self.assertRaises(ValueError):
nullcar.drivers._add_items('car', 'driver', self.unused_driver)
def test_add_related_null(self):
nulldriver = Driver.objects.create(name=None)
with self.assertRaises(ValueError):
self.car.drivers._add_items('car', 'driver', nulldriver)
def test_add_reverse(self):
car2 = Car.objects.create(make="Honda")
self.assertQuerysetEqual(
self.driver.car_set.all(),
["<Car: Toyota>"]
)
self.driver.car_set._add_items('driver', 'car', car2)
self.assertQuerysetEqual(
self.driver.car_set.all(),
["<Car: Toyota>", "<Car: Honda>"],
ordered=False
)
def test_add_null_reverse(self):
nullcar = Car.objects.create(make=None)
with self.assertRaises(ValueError):
self.driver.car_set._add_items('driver', 'car', nullcar)
def test_add_null_reverse_related(self):
nulldriver = Driver.objects.create(name=None)
with self.assertRaises(ValueError):
nulldriver.car_set._add_items('driver', 'car', self.car)
def test_remove(self):
self.assertQuerysetEqual(
self.car.drivers.all(),
["<Driver: Ryan Briscoe>"]
)
self.car.drivers._remove_items('car', 'driver', self.driver)
self.assertQuerysetEqual(
self.car.drivers.all(), [])
def test_remove_reverse(self):
self.assertQuerysetEqual(
self.driver.car_set.all(),
["<Car: Toyota>"]
)
self.driver.car_set._remove_items('driver', 'car', self.car)
self.assertQuerysetEqual(
self.driver.car_set.all(), [])
class ThroughLoadDataTestCase(TestCase):
fixtures = ["m2m_through"]
def test_sequence_creation(self):
"Check that sequences on an m2m_through are created for the through model, not a phantom auto-generated m2m table. Refs #11107"
out = StringIO()
management.call_command("dumpdata", "m2m_through_regress", format="json", stdout=out)
self.assertJSONEqual(out.getvalue().strip(), """[{"pk": 1, "model": "m2m_through_regress.usermembership", "fields": {"price": 100, "group": 1, "user": 1}}, {"pk": 1, "model": "m2m_through_regress.person", "fields": {"name": "Guido"}}, {"pk": 1, "model": "m2m_through_regress.group", "fields": {"name": "Python Core Group"}}]""")
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