How to tell whether your controller action was given parameters?

I am trying to determine whether my controller action was called with parameters or not, without hardcoding which parameters can be added on.

So I want to distinguish between

/my_controller

and

/my_controller?q=1

I know that I could look inside the params hash, and check whether it ONLY contains :controller and :action keys. This seems ugly to me, is there a smarter way of doing this开发者_StackOverflow中文版 check?

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There is one direct solution:

request.env["QUERY_STRING"] # => "q=1"

Or with Ruby 1.9.2:

request.env.QUERY_STRING # => "q=1"

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For GET request you can use request.query_parameters method. There is also request.request_parameters for POST requests.

Results for request.query_parameters.inspect are:

• for '/my_controller' => '{}'
• for '/my_controller?q=1' => {"q"=>"1"}