author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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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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114 |
return super(LoggingUpdateQuery, self).clear_related(related_field, pk_list, using) |
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115 |
original = sql.UpdateQuery |
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116 |
sql.UpdateQuery = LoggingUpdateQuery |
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117 |
|
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118 |
e1.delete() |
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119 |
self.assertEqual(logged, ["f"]) |
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120 |
logged = [] |
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121 |
|
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122 |
e2 = E.objects.create() |
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123 |
f2 = F.objects.create(e=e2) |
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124 |
e2.f = f2 |
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125 |
e2.save() |
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126 |
|
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127 |
# Same deal as before, though we are starting from the other object. |
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128 |
o = CollectedObjects() |
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129 |
f2._collect_sub_objects(o) |
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130 |
self.assertEqual(o.keys(), [F, E]) |
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131 |
f2.delete() |
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132 |
self.assertEqual(logged, ["f"]) |
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133 |
logged = [] |
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134 |
|
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135 |
sql.UpdateQuery = original |