controller_resource.rb

# lib/monkey/cancan/controller_resource.rb
module CanCan
  class ControllerResource

    protected

    def strong_parameters?
      @params.class.name == 'ActionController::Parameters'
    end

    def resource_params
      if [:create, :update].member? @params[:action].to_sym
        param_name = @options[:instance_name] || (@options[:class] || namespaced_name).to_s.underscore.gsub('/', '_')
        if strong_parameters? || @options[:params]
          params_method = (@options[:params] == true || ! @options[:params]) ?
            "#{param_name}_params" : @options[:params]
          return @controller.send params_method if @controller.send :respond_to?, params_method
        end
        @params[param_name]
      end
    end

  end
end