def test_related_model_edits(self):
with revision:
queen = Artist(name='Queen')
queen.save()
a_kind_of_magic = Album(artist=queen, title='A Kind of Magic')
a_kind_of_magic.save()
dont_lose_your_head = Song(album=a_kind_of_magic, title="Don't Lose Your Head")
dont_lose_your_head.save()
first_revision = revision.latest_transactions['default']
with revision:
princes_of_the_universe = Song(album=a_kind_of_magic, title='Princes of the Universe')
princes_of_the_universe.save()
dont_lose_your_head.seconds = 278
dont_lose_your_head.save()
second_revision = revision.latest_transactions['default']
with revision:
princes_of_the_universe.seconds = 212
princes_of_the_universe.save()
friends_will_be_friends = Song(album=a_kind_of_magic, title='Friends Will Be Friends')
friends_will_be_friends.save()
third_revision = revision.latest_transactions['default']
with revision:
# the a_kind_of_magic album was not modified after the initial commit. Verify that we can retrieve the a_kind_of_magic model from the various versions
first_a_kind_of_magic = Album.objects.version(first_revision).get(pk=a_kind_of_magic.pk)
second_a_kind_of_magic = Album.objects.version(second_revision).get(pk=a_kind_of_magic.pk)
third_a_kind_of_magic = Album.objects.version(third_revision).get(pk=a_kind_of_magic.pk)
# Verify that the data is the same.
self.assertEqual(revision.data(first_a_kind_of_magic)['field'], revision.data(second_a_kind_of_magic)['field'])
self.assertEqual(revision.data(second_a_kind_of_magic)['field'], revision.data(third_a_kind_of_magic)['field'])
# Verify that princes_of_the_universe does not exist at the first_revision (it was created on the second revision)
self.assertRaises(ObjectDoesNotExist, first_a_kind_of_magic.songs.get, pk=princes_of_the_universe.pk)
# Verify that retrieving the object from the reverse relationship and directly from the Song objects yield the same result.
self.assertEqual(second_a_kind_of_magic.songs.get(pk=princes_of_the_universe.pk).__dict__, Song.objects.version(second_revision).get(pk=princes_of_the_universe.pk).__dict__)
# Verify that retrieval of the object from the reverse relationship return the correct versions of the objects.
second_princes_of_the_universe = second_a_kind_of_magic.songs.get(pk=princes_of_the_universe.pk)
self.assertEqual(second_princes_of_the_universe.seconds, None)
third_princes_of_the_universe = third_a_kind_of_magic.songs.get(pk=princes_of_the_universe.pk)
self.assertEqual(third_princes_of_the_universe.seconds, 212)
# Verify that the first revision of a_kind_of_magic has one song
self.assertEquals(len(first_a_kind_of_magic.songs.all()), 1)
# Verify that the second revision of a_kind_of_magic has two songs
self.assertEquals(len(second_a_kind_of_magic.songs.all()), 2)
# Verify that the third revision of a_kind_of_magic has three songs
self.assertEquals(len(third_a_kind_of_magic.songs.all()), 3)
