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« The Rails framework encourages RESTful design of your applications, which means you'll be making a lot of "PATCH", "PUT", and "DELETE" requests (besides "GET" and "POST"). However, most browsers don't support methods other than "GET" and "POST" when it comes to submitting forms. » then will you REALLY be making a lot of "PATCH", "PUT", and "DELETE" requests? 
the rails documentation calls this “Ajax”, which is not a word somebody should use in 2021, or ever
Ajax, otherwise known by its more obscure name, “javascript”
the answer is yes, it just submits it using javascript [provided you don’t say otherwise]