def test_validate(self):
constraint_name = 'pony_pink_gte_check'
constraint = CheckConstraint(check=Q(pink__gte=4),
name=constraint_name)
operation = AddConstraintNotValid('Pony', constraint=constraint)
project_state, new_state = self.make_test_state(
self.app_label, operation)
Pony = new_state.apps.get_model(self.app_label, 'Pony')
obj = Pony.objects.create(pink=2, weight=1.0)
# Add constraint.
with connection.schema_editor(atomic=True) as editor:
operation.database_forwards(self.app_label, editor, project_state,
new_state)
project_state = new_state
new_state = new_state.clone()
operation = ValidateConstraint('Pony', name=constraint_name)
operation.state_forwards(self.app_label, new_state)
self.assertEqual(
operation.describe(),
f'Validate constraint {constraint_name} on model Pony',
)
self.assertEqual(
operation.migration_name_fragment,
f'pony_validate_{constraint_name}',
)
# Validate constraint.
with connection.schema_editor(atomic=True) as editor:
msg = f'check constraint "{constraint_name}"'
with self.assertRaisesMessage(IntegrityError, msg):
operation.database_forwards(self.app_label, editor,
project_state, new_state)
obj.pink = 5
obj.save()
with connection.schema_editor(atomic=True) as editor:
operation.database_forwards(self.app_label, editor, project_state,
new_state)
# Reversal is a noop.
with connection.schema_editor() as editor:
with self.assertNumQueries(0):
operation.database_backwards(self.app_label, editor, new_state,
project_state)
# Deconstruction.
name, args, kwargs = operation.deconstruct()
self.assertEqual(name, 'ValidateConstraint')
self.assertEqual(args, [])
self.assertEqual(kwargs, {
'model_name': 'Pony',
'name': constraint_name
})
def test_add(self):
table_name = f'{self.app_label}_pony'
constraint_name = 'pony_pink_gte_check'
constraint = CheckConstraint(check=Q(pink__gte=4),
name=constraint_name)
operation = AddConstraintNotValid('Pony', constraint=constraint)
project_state, new_state = self.make_test_state(
self.app_label, operation)
self.assertEqual(
operation.describe(),
f'Create not valid constraint {constraint_name} on model Pony',
)
self.assertEqual(
operation.migration_name_fragment,
f'pony_{constraint_name}_not_valid',
)
self.assertEqual(
len(new_state.models[self.app_label,
'pony'].options['constraints']),
1,
)
self.assertConstraintNotExists(table_name, constraint_name)
Pony = new_state.apps.get_model(self.app_label, 'Pony')
self.assertEqual(len(Pony._meta.constraints), 1)
Pony.objects.create(pink=2, weight=1.0)
# Add constraint.
with connection.schema_editor(atomic=True) as editor:
operation.database_forwards(self.app_label, editor, project_state,
new_state)
msg = f'check constraint "{constraint_name}"'
with self.assertRaisesMessage(IntegrityError,
msg), transaction.atomic():
Pony.objects.create(pink=3, weight=1.0)
self.assertConstraintExists(table_name, constraint_name)
# Reversal.
with connection.schema_editor(atomic=True) as editor:
operation.database_backwards(self.app_label, editor, project_state,
new_state)
self.assertConstraintNotExists(table_name, constraint_name)
Pony.objects.create(pink=3, weight=1.0)
# Deconstruction.
name, args, kwargs = operation.deconstruct()
self.assertEqual(name, 'AddConstraintNotValid')
self.assertEqual(args, [])
self.assertEqual(kwargs, {
'model_name': 'Pony',
'constraint': constraint
})
def test_non_check_constraint_not_supported(self):
constraint = UniqueConstraint(fields=['pink'], name='pony_pink_uniq')
msg = 'AddConstraintNotValid.constraint must be a check constraint.'
with self.assertRaisesMessage(TypeError, msg):
AddConstraintNotValid(model_name='pony', constraint=constraint)
def test_non_check_constraint_not_supported(self):
constraint = UniqueConstraint(fields=["pink"], name="pony_pink_uniq")
msg = "AddConstraintNotValid.constraint must be a check constraint."
with self.assertRaisesMessage(TypeError, msg):
AddConstraintNotValid(model_name="pony", constraint=constraint)