method_missing

# File actionpack/lib/action_controller/metal/strong_parameters.rb, line 607
    def method_missing(method_sym, *args, &block)
      if @parameters.respond_to?(method_sym)
        message =           Method #{method_sym} is deprecated and will be removed in Rails 5.1,          as `ActionController::Parameters` no longer inherits from          hash. Using this deprecated behavior exposes potential security          problems. If you continue to use this method you may be creating          a security vulnerability in your app that can be exploited. Instead,          consider using one of these documented methods which are not          deprecated: http://api.rubyonrails.org/v#{ActionPack.version}/classes/ActionController/Parameters.html.squish
        ActiveSupport::Deprecation.warn(message)
        @parameters.public_send(method_sym, *args, &block)
      else
        super
      end
    end