本文整理匯總了Python中django.db.migrations.migration.Migration類的典型用法代碼示例。如果您正苦於以下問題：Python Migration類的具體用法？Python Migration怎麽用？Python Migration使用的例子？那麽, 這裏精選的類代碼示例或許可以為您提供幫助。
在下文中一共展示了Migration類的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: test_run_python_atomic
def test_run_python_atomic(self):
"""
Tests the RunPython operation correctly handles the "atomic" keyword
"""
project_state = self.set_up_test_model("test_runpythonatomic", mti_model=True)
def inner_method(models, schema_editor):
Pony = models.get_model("test_runpythonatomic", "Pony")
Pony.objects.create(pink=1, weight=3.55)
raise ValueError("Adrian hates ponies.")
atomic_migration = Migration("test", "test_runpythonatomic")
atomic_migration.operations = [migrations.RunPython(inner_method)]
non_atomic_migration = Migration("test", "test_runpythonatomic")
non_atomic_migration.operations = [migrations.RunPython(inner_method, atomic=False)]
# If we're a fully-transactional database, both versions should rollback
if connection.features.can_rollback_ddl:
self.assertEqual(project_state.render().get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.render().get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
non_atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.render().get_model("test_runpythonatomic", "Pony").objects.count(), 0)
# Otherwise, the non-atomic operation should leave a row there
else:
self.assertEqual(project_state.render().get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.render().get_model("test_runpythonatomic", "Pony").objects.count(), 0)
with self.assertRaises(ValueError):
with connection.schema_editor() as editor:
non_atomic_migration.apply(project_state, editor)
self.assertEqual(project_state.render().get_model("test_runpythonatomic", "Pony").objects.count(), 1)示例2: unapply_operations
def unapply_operations(self, app_label, project_state, operations):
migration = Migration('name', app_label)
migration.operations = operations
with connection.schema_editor() as editor:
return migration.unapply(project_state, editor)