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24f4a4b26f
Backport of r13778 from trunk. git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13795 bcc190cf-cafb-0310-a4f2-bffc1f526a37
136 lines
4.7 KiB
Python
136 lines
4.7 KiB
Python
from django.db.models import sql
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from django.db.models.loading import cache
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from django.db.models.query import CollectedObjects
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from django.db.models.query_utils import CyclicDependency
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from django.test import TestCase
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from models import A, B, C, D, E, F
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class DeleteTests(TestCase):
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def clear_rel_obj_caches(self, *models):
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for m in models:
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if hasattr(m._meta, '_related_objects_cache'):
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del m._meta._related_objects_cache
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def order_models(self, *models):
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cache.app_models["delete"].keyOrder = models
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def setUp(self):
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self.order_models("a", "b", "c", "d", "e", "f")
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self.clear_rel_obj_caches(A, B, C, D, E, F)
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def tearDown(self):
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self.order_models("a", "b", "c", "d", "e", "f")
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self.clear_rel_obj_caches(A, B, C, D, E, F)
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def test_collected_objects(self):
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g = CollectedObjects()
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self.assertFalse(g.add("key1", 1, "item1", None))
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self.assertEqual(g["key1"], {1: "item1"})
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self.assertFalse(g.add("key2", 1, "item1", "key1"))
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self.assertFalse(g.add("key2", 2, "item2", "key1"))
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self.assertEqual(g["key2"], {1: "item1", 2: "item2"})
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self.assertFalse(g.add("key3", 1, "item1", "key1"))
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self.assertTrue(g.add("key3", 1, "item1", "key2"))
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self.assertEqual(g.ordered_keys(), ["key3", "key2", "key1"])
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self.assertTrue(g.add("key2", 1, "item1", "key3"))
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self.assertRaises(CyclicDependency, g.ordered_keys)
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def test_delete(self):
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## Second, test the usage of CollectedObjects by Model.delete()
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# Due to the way that transactions work in the test harness, doing
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# m.delete() here can work but fail in a real situation, since it may
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# delete all objects, but not in the right order. So we manually check
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# that the order of deletion is correct.
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# Also, it is possible that the order is correct 'accidentally', due
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# solely to order of imports etc. To check this, we set the order that
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# 'get_models()' will retrieve to a known 'nice' order, and then try
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# again with a known 'tricky' order. Slightly naughty access to
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# internals here :-)
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# If implementation changes, then the tests may need to be simplified:
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# - remove the lines that set the .keyOrder and clear the related
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# object caches
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# - remove the second set of tests (with a2, b2 etc)
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a1 = A.objects.create()
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b1 = B.objects.create(a=a1)
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c1 = C.objects.create(b=b1)
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d1 = D.objects.create(c=c1, a=a1)
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o = CollectedObjects()
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a1._collect_sub_objects(o)
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self.assertEqual(o.keys(), [D, C, B, A])
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a1.delete()
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# Same again with a known bad order
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self.order_models("d", "c", "b", "a")
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self.clear_rel_obj_caches(A, B, C, D)
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a2 = A.objects.create()
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b2 = B.objects.create(a=a2)
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c2 = C.objects.create(b=b2)
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d2 = D.objects.create(c=c2, a=a2)
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o = CollectedObjects()
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a2._collect_sub_objects(o)
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self.assertEqual(o.keys(), [D, C, B, A])
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a2.delete()
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def test_collected_objects_null(self):
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g = CollectedObjects()
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self.assertFalse(g.add("key1", 1, "item1", None))
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self.assertFalse(g.add("key2", 1, "item1", "key1", nullable=True))
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self.assertTrue(g.add("key1", 1, "item1", "key2"))
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self.assertEqual(g.ordered_keys(), ["key1", "key2"])
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def test_delete_nullable(self):
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e1 = E.objects.create()
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f1 = F.objects.create(e=e1)
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e1.f = f1
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e1.save()
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# Since E.f is nullable, we should delete F first (after nulling out
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# the E.f field), then E.
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o = CollectedObjects()
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e1._collect_sub_objects(o)
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self.assertEqual(o.keys(), [F, E])
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# temporarily replace the UpdateQuery class to verify that E.f is
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# actually nulled out first
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logged = []
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class LoggingUpdateQuery(sql.UpdateQuery):
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def clear_related(self, related_field, pk_list, using):
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logged.append(related_field.name)
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return super(LoggingUpdateQuery, self).clear_related(related_field, pk_list, using)
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original = sql.UpdateQuery
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sql.UpdateQuery = LoggingUpdateQuery
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e1.delete()
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self.assertEqual(logged, ["f"])
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logged = []
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e2 = E.objects.create()
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f2 = F.objects.create(e=e2)
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e2.f = f2
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e2.save()
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# Same deal as before, though we are starting from the other object.
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o = CollectedObjects()
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f2._collect_sub_objects(o)
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self.assertEqual(o.keys(), [F, E])
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f2.delete()
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self.assertEqual(logged, ["f"])
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logged = []
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sql.UpdateQuery = original
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