Identify GET and POST parameters in Ruby on Rails

Question

What is the simplest way to identify and separate GET and POST parameters from a controller in Ruby on Rails, which will be equivalent to $_GET and $_POST variables in PHP?<

Answer 1

There are three very-lightly-documented hash accessors on the request object for this:

• request.query_parameters - sent as part of the query string, i.e. after a ?
• request.path_parameters - decoded from the URL via routing, i.e. controller, action, id
• request.request_parameters - All params, including above as well as any sent as part of the POST body

You can use Hash#reject to get to the POST-only params as needed.

Source: http://guides.rubyonrails.org/v2.3.8/action_controller_overview.html section 9.1.1

I looked in an old Rails 1.2.6 app and these accessors existed back then as well.