how to send parameter to the action of another controller through url in rails?

how to send parameter to the action of another controller through url in rails?

controller1:

def show

@controller1.id = params[:controller1_id]

end

in the view of controller1:

%a.btn-general{:href => "/controller2/new/#{parameteroffirst.id}", :controller1_id @controller1.id, :role => "button"} Add the first

how to send controller1.id to new action of controller2?