try:

    from cStringIO import StringIO

except ImportError:

    from StringIO import StringIO

from django.core import management

from django.contrib.auth.models import User

from django.test import TestCase

from models import Person, Group, Membership, 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>",

            ]

        )

        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>",

            ]

        )

        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.assertEqual(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.assertEqual(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 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.assertEqual(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"}}]""")