def test_json_serialize_deserialize_deleted_obj():
obj = Example.objects.create(name="test_name")
obj_ref = ExampleReference.objects.create(name="refname", ref=obj)
result = serialize_object_json(obj_ref, refs=["ref"])
expect_data = {
"model": "tests.examplereference",
"pk": obj_ref.id,
"fields": {"name": "refname", "long_name": "", "ref": obj.id},
"refs": {
"ref": {
"model": "tests.example",
"pk": obj.id,
"fields": {"name": "test_name"},
"refs": {},
}
},
}
obj.delete()
obj_ref.delete()
assert json.loads(result) == expect_data
obj_snapshot = deserialize_object_json(result)
assert obj_ref.name == obj_snapshot.name
assert obj_ref.ref.name == obj.name
def test_measurement_json_serialize_deserialize():
from tests.models import MeasurementModel
obj = MeasurementModel.objects.create(height=Distance(cm=20.0))
result = serialize_object_json(obj)
obj_snapshot = deserialize_object_json(result)
assert obj_snapshot
assert obj_snapshot.height == obj.height
def test_json_serialize_deserialize():
obj = Example.objects.create(name="test_name")
obj_ref = ExampleReference.objects.create(name="refname", ref=obj)
result = serialize_object_json(obj_ref, refs=["ref"])
obj_snapshot = deserialize_object_json(result)
assert obj_ref.id == obj_snapshot.id
assert obj_ref.name == obj_snapshot.name
assert obj_ref.ref.name == obj.name
def test_json_serialize_deserialize_with_new_fields():
obj = Example.objects.create(name="test_name")
obj_ref = ExampleReference.objects.create(name="refname", ref=obj)
result = serialize_object_json(obj_ref, refs=["ref"])
result_dict = json.loads(result)
# Maybe ref has been create after serialization
del result_dict["fields"]["long_name"]
result = json.dumps(result_dict)
obj_snapshot = deserialize_object_json(result)
assert obj_ref.id == obj_snapshot.id
assert obj_ref.name == obj_snapshot.name
assert obj_ref.ref.name == obj.name
def test_json_serialize_deserialize_with_non_existed_fields():
obj = Example.objects.create(name="test_name")
obj_ref = ExampleReference.objects.create(name="refname", ref=obj)
result = serialize_object_json(obj_ref, refs=["ref"])
result_dict = json.loads(result)
# Unexisted fields and refs must be ignore
result_dict["fields"]["slug"] = "removed field"
result = json.dumps(result_dict)
obj_snapshot = deserialize_object_json(result)
assert obj_ref.id == obj_snapshot.id
assert obj_ref.name == obj_snapshot.name
assert obj_ref.ref.name == obj.name
def get_db_prep_value(self, value, connection, prepared=False):
if value and not isinstance(value, models.Model):
raise ValueError("Need model instance")
if value is None:
return None
if isinstance(value, six.string_types):
# maybe serialized
return value
model_class = value._meta.concrete_model
opts = self.get_snapshot_opts(model_class)
if PolymorphicModel is not None:
if isinstance(value, PolymorphicModel):
# hack for polymorphic model
model_class._meta = copy.copy(
model_class._meta)
model_class._meta.local_fields = model_class._meta.fields
return serialize_object_json(value, **opts)