django/tests/modeltests/fixtures/models.py

"""
39. Fixtures.

Fixtures are a way of loading data into the database in bulk. Fixure data 
can be stored in any serializable format (including JSON and XML). Fixtures 
are identified by name, and are stored in either a directory named 'fixtures'
in the application directory, on in one of the directories named in the 
FIXTURE_DIRS setting.
"""

from django.db import models

class Article(models.Model):
    headline = models.CharField(maxlength=100, default='Default headline')
    pub_date = models.DateTimeField()

    def __str__(self):
        return self.headline
        
    class Meta:
        ordering = ('-pub_date', 'headline')
        
__test__ = {'API_TESTS': """
>>> from django.core import management
>>> from django.db.models import get_app

# Reset the database representation of this app. 
# This will return the database to a clean initial state.
>>> management.flush(verbosity=0, interactive=False)

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

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

# Load fixture 2. JSON file imported by default. Overwrites some existing objects
>>> management.load_data(['fixture2.json'], verbosity=0)
>>> 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.load_data(['fixture3.xml'], verbosity=0)
>>> 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 a fixture that doesn't exist
>>> management.load_data(['unknown.json'], verbosity=0)

# object list is unaffected
>>> 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>]

# Reset the database representation of this app. This will delete all data.
>>> management.flush(verbosity=0, interactive=False)
>>> Article.objects.all()
[<Article: Python program becomes self aware>]

# Load fixture 1 again, using format discovery
>>> management.load_data(['fixture1'], verbosity=0)
>>> 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 
>>> management.load_data(['fixture2'], verbosity=0) # doctest: +ELLIPSIS
Multiple fixtures named 'fixture2' in '...fixtures'. Aborting.

>>> 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
>>> print management.dump_data(['fixtures'], format='json')
[{"pk": "3", "model": "fixtures.article", "fields": {"headline": "Time to reform copyright", "pub_date": "2006-06-16 13:00:00"}}, {"pk": "2", "model": "fixtures.article", "fields": {"headline": "Poker has no place on ESPN", "pub_date": "2006-06-16 12:00:00"}}, {"pk": "1", "model": "fixtures.article", "fields": {"headline": "Python program becomes self aware", "pub_date": "2006-06-16 11:00:00"}}]
"""}

from django.test import TestCase

class SampleTestCase(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.assertEquals(str(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>]")