Extracting the actual POST parameters from a Rails request

I'm trying to parse the POST params out of an AJAX form submission in Rails, but for some reason it keeps on including a nested, duplicate version of the parameters, and I'm not sure why.

AJAX:

  $.ajax({
    type: 'POST',
    url: url,
    data: JSON.stringify({foo:'bar',timestamp:Date.now()}),
    dataType: 'json',
    contentType: 'application/json; charset=utf-8'
  });

RAILS:

class TestController < ApplicationController

  def post_test
    puts "RAW POST: #{request.raw_post}"
    puts "POST PARAMS: #{request.request_parameters().to_json}"
  end

end

RESULT:

> RAW POST: {"foo":"bar","timestamp":1690813226909}
> POST PARAMS: {"foo":"bar","timestamp":1690813226909,"test":{"foo":"bar","timestamp":1690813226909}}

Why is the request_parameters() method including the redundant nested set of parameters?

Almost certainly because you have wrap_parameters configured.

Update

Hmm, looks like that's done automatically now in Rails 7, even without wrap_parameters configured.

Reading de docs of Ajax on Jquery: https://api.jquery.com/jquery.ajax/ you can pass objects, strings, or arrays to the data argument

$.ajax({
  type: 'POST',
  url: url,
  data: { foo:'bar', timestamp:Date.now() },
  dataType: 'json',
  contentType: 'application/json; charset=utf-8'
});

In this way you can send a complete object without parsing to string and receive it on rails in the following way:

class TestController < ApplicationController

  def post_test
    puts "All data: #{params}"
  end

end

PD: Sorry for my poor English