您如何访问通过 AJAX 请求发布的 Rails controller 上的 Ruby 中的数据？

Question

I'm sending an AJAX request and posting some json data to the server. How do I access this data in my controller (I'm using Ruby on Rails).

Answer 1

It should be trivial:

data = ActiveSupport::JSON::decode(params[:param_with_json_string])

Answer 2

If you set the Content-Type of the post request to application/json then Rails will handle things for you and make the data available in the params hash like normal.

Example using jQuery:

$.ajax({
  url:'/some_url', 
  data: {user: {name:"Bob", email: "bob@example.com"}}, 
  dataType: 'json',
  type: 'POST'
});

Answer 3

Access the parameter through the params hash. There should be no need to decode JSON. Rails should convert it into a hash for you.