django/tests/modeltests/fixtures/tests.py

from __future__ import absolute_import

import StringIO

from django.contrib.sites.models import Site
from django.core import management
from django.db import connection
from django.test import TestCase, TransactionTestCase, skipUnlessDBFeature

from .models import Article, Book, Spy, Tag, Visa


class TestCaseFixtureLoadingTests(TestCase):
    fixtures = ['fixture1.json', 'fixture2.json']

    def testClassFixtures(self):
        "Check that test case has installed 4 fixture objects"
        self.assertEqual(Article.objects.count(), 4)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Django conquers world!>',
            '<Article: Copyright is fine the way it is>',
            '<Article: Poker has no place on ESPN>',
            '<Article: Python program becomes self aware>'
        ])

class FixtureLoadingTests(TestCase):

    def _dumpdata_assert(self, args, output, format='json', natural_keys=False,
                         use_base_manager=False, exclude_list=[]):
        new_io = StringIO.StringIO()
        management.call_command('dumpdata', *args, **{'format':format,
                                                      'stdout':new_io,
                                                      'stderr':new_io,
                                                      'use_natural_keys':natural_keys,
                                                      'use_base_manager':use_base_manager,
                                                      'exclude': exclude_list})
        command_output = new_io.getvalue().strip()
        self.assertEqual(command_output, output)

    def test_initial_data(self):
        # Syncdb introduces 1 initial data object from initial_data.json.
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Python program becomes self aware>'
        ])

    def test_loading_and_dumping(self):
        new_io = StringIO.StringIO()

        Site.objects.all().delete()
        # Load fixture 1. Single JSON file, with two objects.
        management.call_command('loaddata', 'fixture1.json', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Time to reform copyright>',
            '<Article: Poker has no place on ESPN>',
            '<Article: Python program becomes self aware>'
        ])

        # Dump the current contents of the database as a JSON fixture
        self._dumpdata_assert(['fixtures'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}]')

        # Try just dumping the contents of fixtures.Category
        self._dumpdata_assert(['fixtures.Category'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}]')

        # ...and just fixtures.Article
        self._dumpdata_assert(['fixtures.Article'], '[{"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}]')

        # ...and both
        self._dumpdata_assert(['fixtures.Category', 'fixtures.Article'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}]')

        # Specify a specific model twice
        self._dumpdata_assert(['fixtures.Article', 'fixtures.Article'], '[{"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}]')

        # Specify a dump that specifies Article both explicitly and implicitly
        self._dumpdata_assert(['fixtures.Article', 'fixtures'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}]')

        # Same again, but specify in the reverse order
        self._dumpdata_assert(['fixtures'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}]')

        # Specify one model from one application, and an entire other application.
        self._dumpdata_assert(['fixtures.Category', 'sites'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 1, "model": "sites.site", "fields": {"domain": "example.com", "name": "example.com"}}]')

        # Load fixture 2. JSON file imported by default. Overwrites some existing objects
        management.call_command('loaddata', 'fixture2.json', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Django conquers world!>',
            '<Article: Copyright is fine the way it is>',
            '<Article: Poker has no place on ESPN>',
            '<Article: Python program becomes self aware>'
        ])

        # Load fixture 3, XML format.
        management.call_command('loaddata', 'fixture3.xml', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: XML identified as leading cause of cancer>',
            '<Article: Django conquers world!>',
            '<Article: Copyright is fine the way it is>',
            '<Article: Poker on TV is great!>',
            '<Article: Python program becomes self aware>'
        ])

        # Load fixture 6, JSON file with dynamic ContentType fields. Testing ManyToOne.
        management.call_command('loaddata', 'fixture6.json', verbosity=0, commit=False)
        self.assertQuerysetEqual(Tag.objects.all(), [
            '<Tag: <Article: Copyright is fine the way it is> tagged "copyright">',
            '<Tag: <Article: Copyright is fine the way it is> tagged "law">'
        ])

        # Load fixture 7, XML file with dynamic ContentType fields. Testing ManyToOne.
        management.call_command('loaddata', 'fixture7.xml', verbosity=0, commit=False)
        self.assertQuerysetEqual(Tag.objects.all(), [
            '<Tag: <Article: Copyright is fine the way it is> tagged "copyright">',
            '<Tag: <Article: Copyright is fine the way it is> tagged "legal">',
            '<Tag: <Article: Django conquers world!> tagged "django">',
            '<Tag: <Article: Django conquers world!> tagged "world domination">'
        ])

        # Load fixture 8, JSON file with dynamic Permission fields. Testing ManyToMany.
        management.call_command('loaddata', 'fixture8.json', verbosity=0, commit=False)
        self.assertQuerysetEqual(Visa.objects.all(), [
            '<Visa: Django Reinhardt Can add user, Can change user, Can delete user>',
            '<Visa: Stephane Grappelli Can add user>',
            '<Visa: Prince >'
        ])

        # Load fixture 9, XML file with dynamic Permission fields. Testing ManyToMany.
        management.call_command('loaddata', 'fixture9.xml', verbosity=0, commit=False)
        self.assertQuerysetEqual(Visa.objects.all(), [
            '<Visa: Django Reinhardt Can add user, Can change user, Can delete user>',
            '<Visa: Stephane Grappelli Can add user, Can delete user>',
            '<Visa: Artist formerly known as "Prince" Can change user>'
        ])

        self.assertQuerysetEqual(Book.objects.all(), [
            '<Book: Music for all ages by Artist formerly known as "Prince" and Django Reinhardt>'
        ])

        # Load a fixture that doesn't exist
        management.call_command('loaddata', 'unknown.json', verbosity=0, commit=False)

        # object list is unaffected
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: XML identified as leading cause of cancer>',
            '<Article: Django conquers world!>',
            '<Article: Copyright is fine the way it is>',
            '<Article: Poker on TV is great!>',
            '<Article: Python program becomes self aware>'
        ])

        # By default, you get raw keys on dumpdata
        self._dumpdata_assert(['fixtures.book'], '[{"pk": 1, "model": "fixtures.book", "fields": {"name": "Music for all ages", "authors": [3, 1]}}]')

        # But you can get natural keys if you ask for them and they are available
        self._dumpdata_assert(['fixtures.book'], '[{"pk": 1, "model": "fixtures.book", "fields": {"name": "Music for all ages", "authors": [["Artist formerly known as \\"Prince\\""], ["Django Reinhardt"]]}}]', natural_keys=True)

        # Dump the current contents of the database as a JSON fixture
        self._dumpdata_assert(['fixtures'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 5, "model": "fixtures.article", "fields": {"headline": "XML identified as leading cause of cancer", "pub_date": "2006-06-16T16:00:00"}}, {"pk": 4, "model": "fixtures.article", "fields": {"headline": "Django conquers world!", "pub_date": "2006-06-16T15:00:00"}}, {"pk": 3, "model": "fixtures.article", "fields": {"headline": "Copyright is fine the way it is", "pub_date": "2006-06-16T14:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker on TV is great!", "pub_date": "2006-06-16T11:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}, {"pk": 1, "model": "fixtures.tag", "fields": {"tagged_type": ["fixtures", "article"], "name": "copyright", "tagged_id": 3}}, {"pk": 2, "model": "fixtures.tag", "fields": {"tagged_type": ["fixtures", "article"], "name": "legal", "tagged_id": 3}}, {"pk": 3, "model": "fixtures.tag", "fields": {"tagged_type": ["fixtures", "article"], "name": "django", "tagged_id": 4}}, {"pk": 4, "model": "fixtures.tag", "fields": {"tagged_type": ["fixtures", "article"], "name": "world domination", "tagged_id": 4}}, {"pk": 3, "model": "fixtures.person", "fields": {"name": "Artist formerly known as \\"Prince\\""}}, {"pk": 1, "model": "fixtures.person", "fields": {"name": "Django Reinhardt"}}, {"pk": 2, "model": "fixtures.person", "fields": {"name": "Stephane Grappelli"}}, {"pk": 1, "model": "fixtures.visa", "fields": {"person": ["Django Reinhardt"], "permissions": [["add_user", "auth", "user"], ["change_user", "auth", "user"], ["delete_user", "auth", "user"]]}}, {"pk": 2, "model": "fixtures.visa", "fields": {"person": ["Stephane Grappelli"], "permissions": [["add_user", "auth", "user"], ["delete_user", "auth", "user"]]}}, {"pk": 3, "model": "fixtures.visa", "fields": {"person": ["Artist formerly known as \\"Prince\\""], "permissions": [["change_user", "auth", "user"]]}}, {"pk": 1, "model": "fixtures.book", "fields": {"name": "Music for all ages", "authors": [["Artist formerly known as \\"Prince\\""], ["Django Reinhardt"]]}}]', natural_keys=True)

        # Dump the current contents of the database as an XML fixture
        self._dumpdata_assert(['fixtures'], """<?xml version="1.0" encoding="utf-8"?>
<django-objects version="1.0"><object pk="1" model="fixtures.category"><field type="CharField" name="title">News Stories</field><field type="TextField" name="description">Latest news stories</field></object><object pk="5" model="fixtures.article"><field type="CharField" name="headline">XML identified as leading cause of cancer</field><field type="DateTimeField" name="pub_date">2006-06-16T16:00:00</field></object><object pk="4" model="fixtures.article"><field type="CharField" name="headline">Django conquers world!</field><field type="DateTimeField" name="pub_date">2006-06-16T15:00:00</field></object><object pk="3" model="fixtures.article"><field type="CharField" name="headline">Copyright is fine the way it is</field><field type="DateTimeField" name="pub_date">2006-06-16T14:00:00</field></object><object pk="2" model="fixtures.article"><field type="CharField" name="headline">Poker on TV is great!</field><field type="DateTimeField" name="pub_date">2006-06-16T11:00:00</field></object><object pk="1" model="fixtures.article"><field type="CharField" name="headline">Python program becomes self aware</field><field type="DateTimeField" name="pub_date">2006-06-16T11:00:00</field></object><object pk="1" model="fixtures.tag"><field type="CharField" name="name">copyright</field><field to="contenttypes.contenttype" name="tagged_type" rel="ManyToOneRel"><natural>fixtures</natural><natural>article</natural></field><field type="PositiveIntegerField" name="tagged_id">3</field></object><object pk="2" model="fixtures.tag"><field type="CharField" name="name">legal</field><field to="contenttypes.contenttype" name="tagged_type" rel="ManyToOneRel"><natural>fixtures</natural><natural>article</natural></field><field type="PositiveIntegerField" name="tagged_id">3</field></object><object pk="3" model="fixtures.tag"><field type="CharField" name="name">django</field><field to="contenttypes.contenttype" name="tagged_type" rel="ManyToOneRel"><natural>fixtures</natural><natural>article</natural></field><field type="PositiveIntegerField" name="tagged_id">4</field></object><object pk="4" model="fixtures.tag"><field type="CharField" name="name">world domination</field><field to="contenttypes.contenttype" name="tagged_type" rel="ManyToOneRel"><natural>fixtures</natural><natural>article</natural></field><field type="PositiveIntegerField" name="tagged_id">4</field></object><object pk="3" model="fixtures.person"><field type="CharField" name="name">Artist formerly known as "Prince"</field></object><object pk="1" model="fixtures.person"><field type="CharField" name="name">Django Reinhardt</field></object><object pk="2" model="fixtures.person"><field type="CharField" name="name">Stephane Grappelli</field></object><object pk="1" model="fixtures.visa"><field to="fixtures.person" name="person" rel="ManyToOneRel"><natural>Django Reinhardt</natural></field><field to="auth.permission" name="permissions" rel="ManyToManyRel"><object><natural>add_user</natural><natural>auth</natural><natural>user</natural></object><object><natural>change_user</natural><natural>auth</natural><natural>user</natural></object><object><natural>delete_user</natural><natural>auth</natural><natural>user</natural></object></field></object><object pk="2" model="fixtures.visa"><field to="fixtures.person" name="person" rel="ManyToOneRel"><natural>Stephane Grappelli</natural></field><field to="auth.permission" name="permissions" rel="ManyToManyRel"><object><natural>add_user</natural><natural>auth</natural><natural>user</natural></object><object><natural>delete_user</natural><natural>auth</natural><natural>user</natural></object></field></object><object pk="3" model="fixtures.visa"><field to="fixtures.person" name="person" rel="ManyToOneRel"><natural>Artist formerly known as "Prince"</natural></field><field to="auth.permission" name="permissions" rel="ManyToManyRel"><object><natural>change_user</natural><natural>auth</natural><natural>user</natural></object></field></object><object pk="1" model="fixtures.book"><field type="CharField" name="name">Music for all ages</field><field to="fixtures.person" name

    def test_dumpdata_with_excludes(self):
        # Load fixture1 which has a site, two articles, and a category
        Site.objects.all().delete()
        management.call_command('loaddata', 'fixture1.json', verbosity=0, commit=False)

        # Excluding fixtures app should only leave sites
        self._dumpdata_assert(
            ['sites', 'fixtures'],
            '[{"pk": 1, "model": "sites.site", "fields": {"domain": "example.com", "name": "example.com"}}]',
            exclude_list=['fixtures'])

        # Excluding fixtures.Article should leave fixtures.Category
        self._dumpdata_assert(
            ['sites', 'fixtures'],
            '[{"pk": 1, "model": "sites.site", "fields": {"domain": "example.com", "name": "example.com"}}, {"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}]',
            exclude_list=['fixtures.Article'])

        # Excluding fixtures and fixtures.Article should be a no-op
        self._dumpdata_assert(
            ['sites', 'fixtures'],
            '[{"pk": 1, "model": "sites.site", "fields": {"domain": "example.com", "name": "example.com"}}, {"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}]',
            exclude_list=['fixtures.Article'])

        # Excluding sites and fixtures.Article should only leave fixtures.Category
        self._dumpdata_assert(
            ['sites', 'fixtures'],
            '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}]',
            exclude_list=['fixtures.Article', 'sites'])

        # Excluding a bogus app should throw an error
        self.assertRaises(SystemExit,
                          self._dumpdata_assert,
                          ['fixtures', 'sites'],
                          '',
                          exclude_list=['foo_app'])

        # Excluding a bogus model should throw an error
        self.assertRaises(SystemExit,
                          self._dumpdata_assert,
                          ['fixtures', 'sites'],
                          '',
                          exclude_list=['fixtures.FooModel'])

    def test_dumpdata_with_filtering_manager(self):
        spy1 = Spy.objects.create(name='Paul')
        spy2 = Spy.objects.create(name='Alex', cover_blown=True)
        self.assertQuerysetEqual(Spy.objects.all(),
                                 ['<Spy: Paul>'])
        # Use the default manager
        self._dumpdata_assert(['fixtures.Spy'],'[{"pk": %d, "model": "fixtures.spy", "fields": {"cover_blown": false}}]' % spy1.pk)
        # Dump using Django's base manager. Should return all objects,
        # even those normally filtered by the manager
        self._dumpdata_assert(['fixtures.Spy'], '[{"pk": %d, "model": "fixtures.spy", "fields": {"cover_blown": true}}, {"pk": %d, "model": "fixtures.spy", "fields": {"cover_blown": false}}]' % (spy2.pk, spy1.pk), use_base_manager=True)

    def test_compress_format_loading(self):
        # Load fixture 4 (compressed), using format specification
        management.call_command('loaddata', 'fixture4.json', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Django pets kitten>',
            '<Article: Python program becomes self aware>'
        ])

    def test_compressed_specified_loading(self):
        # Load fixture 5 (compressed), using format *and* compression specification
        management.call_command('loaddata', 'fixture5.json.zip', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: WoW subscribers now outnumber readers>',
            '<Article: Python program becomes self aware>'
        ])

    def test_compressed_loading(self):
        # Load fixture 5 (compressed), only compression specification
        management.call_command('loaddata', 'fixture5.zip', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: WoW subscribers now outnumber readers>',
            '<Article: Python program becomes self aware>'
        ])

    def test_ambiguous_compressed_fixture(self):
        # The name "fixture5" is ambigous, so loading it will raise an error
        new_io = StringIO.StringIO()
        management.call_command('loaddata', 'fixture5', verbosity=0, stderr=new_io, commit=False)
        output = new_io.getvalue().strip().split('\n')
        self.assertEqual(len(output), 1)
        self.assertTrue(output[0].startswith("Multiple fixtures named 'fixture5'"))

    def test_db_loading(self):
        # Load db fixtures 1 and 2. These will load using the 'default' database identifier implicitly
        management.call_command('loaddata', 'db_fixture_1', verbosity=0, commit=False)
        management.call_command('loaddata', 'db_fixture_2', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Who needs more than one database?>',
            '<Article: Who needs to use compressed data?>',
            '<Article: Python program becomes self aware>'
        ])

    def test_loaddata_error_message(self):
        """
        Verifies that loading a fixture which contains an invalid object
        outputs an error message which contains the pk of the object
        that triggered the error.
        """
        # MySQL needs a little prodding to reject invalid data.
        # This won't affect other tests because the database connection
        # is closed at the end of each test.
        if connection.vendor == 'mysql':
            connection.cursor().execute("SET sql_mode = 'TRADITIONAL'")
        new_io = StringIO.StringIO()
        management.call_command('loaddata', 'invalid.json', verbosity=0, stderr=new_io, commit=False)
        output = new_io.getvalue().strip().split('\n')
        self.assertRegexpMatches(output[-1], "Error: Could not load fixtures.Article\(pk=1\): .*$")

    def test_loading_using(self):
        # Load db fixtures 1 and 2. These will load using the 'default' database identifier explicitly
        management.call_command('loaddata', 'db_fixture_1', verbosity=0, using='default', commit=False)
        management.call_command('loaddata', 'db_fixture_2', verbosity=0, using='default', commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Who needs more than one database?>',
            '<Article: Who needs to use compressed data?>',
            '<Article: Python program becomes self aware>'
        ])

    def test_unmatched_identifier_loading(self):
        # Try to load db fixture 3. This won't load because the database identifier doesn't match
        management.call_command('loaddata', 'db_fixture_3', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Python program becomes self aware>'
        ])

        management.call_command('loaddata', 'db_fixture_3', verbosity=0, using='default', commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Python program becomes self aware>'
        ])

    def test_output_formats(self):
        # Load back in fixture 1, we need the articles from it
        management.call_command('loaddata', 'fixture1', verbosity=0, commit=False)

        # Try to load fixture 6 using format discovery
        management.call_command('loaddata', 'fixture6', verbosity=0, commit=False)
        self.assertQuerysetEqual(Tag.objects.all(), [
            '<Tag: <Article: Time to reform copyright> tagged "copyright">',
            '<Tag: <Article: Time to reform copyright> tagged "law">'
        ])

        # Dump the current contents of the database as a JSON fixture
        self._dumpdata_assert(['fixtures'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}, {"pk": 1, "model": "fixtures.tag", "fields": {"tagged_type": ["fixtures", "article"], "name": "copyright", "tagged_id": 3}}, {"pk": 2, "model": "fixtures.tag", "fields": {"tagged_type": ["fixtures", "article"], "name": "law", "tagged_id": 3}}, {"pk": 1, "model": "fixtures.person", "fields": {"name": "Django Reinhardt"}}, {"pk": 3, "model": "fixtures.person", "fields": {"name": "Prince"}}, {"pk": 2, "model": "fixtures.person", "fields": {"name": "Stephane Grappelli"}}]', natural_keys=True)

        # Dump the current contents of the database as an XML fixture
        self._dumpdata_assert(['fixtures'], """<?xml version="1.0" encoding="utf-8"?>
<django-objects version="1.0"><object pk="1" model="fixtures.category"><field type="CharField" name="title">News Stories</field><field type="TextField" name="description">Latest news stories</field></object><object pk="3" model="fixtures.article"><field type="CharField" name="headline">Time to reform copyright</field><field type="DateTimeField" name="pub_date">2006-06-16T13:00:00</field></object><object pk="2" model="fixtures.article"><field type="CharField" name="headline">Poker has no place on ESPN</field><field type="DateTimeField" name="pub_date">2006-06-16T12:00:00</field></object><object pk="1" model="fixtures.article"><field type="CharField" name="headline">Python program becomes self aware</field><field type="DateTimeField" name="pub_date">2006-06-16T11:00:00</field></object><object pk="1" model="fixtures.tag"><field type="CharField" name="name">copyright</field><field to="contenttypes.contenttype" name="tagged_type" rel="ManyToOneRel"><natural>fixtures</natural><natural>article</natural></field><field type="PositiveIntegerField" name="tagged_id">3</field></object><object pk="2" model="fixtures.tag"><field type="CharField" name="name">law</field><field to="contenttypes.contenttype" name="tagged_type" rel="ManyToOneRel"><natural>fixtures</natural><natural>article</natural></field><field type="PositiveIntegerField" name="tagged_id">3</field></object><object pk="1" model="fixtures.person"><field type="CharField" name="name">Django Reinhardt</field></object><object pk="3" model="fixtures.person"><field type="CharField" name="name">Prince</field></object><object pk="2" model="fixtures.person"><field type="CharField" name="name">Stephane Grappelli</field></object></django-objects>""", format='xml', natural_keys=True)

class FixtureTransactionTests(TransactionTestCase):
    def _dumpdata_assert(self, args, output, format='json'):
        new_io = StringIO.StringIO()
        management.call_command('dumpdata', *args, **{'format':format, 'stdout':new_io})
        command_output = new_io.getvalue().strip()
        self.assertEqual(command_output, output)

    @skipUnlessDBFeature('supports_forward_references')
    def test_format_discovery(self):
        # Load fixture 1 again, using format discovery
        management.call_command('loaddata', 'fixture1', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Time to reform copyright>',
            '<Article: Poker has no place on ESPN>',
            '<Article: Python program becomes self aware>'
        ])

        # Try to load fixture 2 using format discovery; this will fail
        # because there are two fixture2's in the fixtures directory
        new_io = StringIO.StringIO()
        management.call_command('loaddata', 'fixture2', verbosity=0, stderr=new_io)
        output = new_io.getvalue().strip().split('\n')
        self.assertEqual(len(output), 1)
        self.assertTrue(output[0].startswith("Multiple fixtures named 'fixture2'"))

        # object list is unaffected
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Time to reform copyright>',
            '<Article: Poker has no place on ESPN>',
            '<Article: Python program becomes self aware>'
        ])

        # Dump the current contents of the database as a JSON fixture
        self._dumpdata_assert(['fixtures'], '[{"pk": 1, "model": "fixtures.category", "fields": {"description": "Latest news stories", "title": "News Stories"}}, {"pk": 3, "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16T13:00:00"}}, {"pk": 2, "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16T12:00:00"}}, {"pk": 1, "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16T11:00:00"}}]')

        # Load fixture 4 (compressed), using format discovery
        management.call_command('loaddata', 'fixture4', verbosity=0, commit=False)
        self.assertQuerysetEqual(Article.objects.all(), [
            '<Article: Django pets kitten>',
            '<Article: Time to reform copyright>',
            '<Article: Poker has no place on ESPN>',
            '<Article: Python program becomes self aware>'
        ])