Snapshot validation

[KislyakovDS]

Is there some best way to validate snapshot for a model? I need to check snapshot for types.union dispatcher.

const Node = types.union(
	{ dispatcher: (snapshot) => 'message' in snapshot ? Message : Form },
	Form,
	Message
);

I don't want to check properties in snapshot. I have an idea to create model instance with snapshot and check if error will be throw. May be there is best practice for this case?

[EmilTholin]

Hi @KislyakovDS!

The dispatcher option isn't really a validator, but rather a function to help determine what type of model the snapshot actually represents. I don't think you will be able to skip this if you have a union with two custom models.

You could e.g. do what the Ignite boilerplate does and try to instantiate a model in a try/catch, and have some fallback behavior if an error is thrown, but again I don't think this will help with determining the type of the union.

[KislyakovDS]

Ok, I understand, thanks a lot. I have more complicated structure of models and I provided simple example.