a simple example of method_missing and why you should use it with care

method_missing_v1.rb

class Item
  attr_reader :id

  def initialize(id, properties)
    @id = id
    @properties = properties
  end

  def method_missing(m, *args, &block)
    @properties[m]
  end
end 

i=Item.new(1, {:name => "car", :color => "red"})
p i.color