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copied!<p>Thanks for both answers.</p> <p>It seems I came out with an equivalent solution at last : <strong>the mutable container</strong>.</p> <p>I created a new class '<code>OutputParameter</code>' that contains (as <strong>attr_accessors</strong>) the parameters that I want to output from my method. Then I passed an instance of this class to my method.</p> <pre><code> class OutputParameters attr_accessor :order_id, pizza end class RestaurantController < ApplicationController def pizza_to_deliver(pizza_name, output_parameters) # pizza to eat pizza = Pizza.where(:name => pizza_name).first # unknown pizza return false if pizza.nil? # first customer order about this pizza id_of_the_order = Orders.where(:pizza_id => pizza.id).first # Output values returned output_parameters.pizza = pizza output_parameters.order_id = id_of_the_order true end end my_pizza_name = 'margerita' my_output = OutputParameters.new my_restaurant = RestaurantController.new if my_restaurant.pizza_to_deliver(my_pizza_name, my_output) then puts "Pizza to deliver : #{my_output.order_id}" rex_dog.eat(my_output.pizza) end </code></pre> <hr> <p>The hash or array you suggested seems even a better idea as it is more adaptative : I wouldn't have to declare a class.</p> <p>I would just use the merge! method</p> <pre><code> class RestaurantController < ApplicationController def pizza_to_deliver(pizza_name, output_hash) # pizza to eat pizza = Pizza.where(:name => pizza_name).first # unknown pizza return false if pizza.nil? # first customer order about this pizza id_of_the_order = Orders.where(:pizza_id => pizza.id).first # Output values returned output_hash.merge!({:pizza => pizza}) output_hash.merge!({:id_of_the_order => id_of_the_order}) true end end my_pizza_name = 'margerita' my_output_hash = {} my_restaurant = RestaurantController.new if my_restaurant.pizza_to_deliver(my_pizza_name, my_output_hash) then puts "Pizza to deliver : #{my_output_hash[:id_of_the_order]}" rex_dog.eat(my_output_hash[:pizza]) end </code></pre>

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