Introduction to Metaprogramming: Lesson 4

customer.rb

class Customer
  attr_reader :id, :datasource

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

  def method_missing(methodname, *args, &block)
    super unless @datasource.respond_to? "get_#{methodname}_value"
    value = datasource.send("get_#{methodname}_value", id)
    "#{methodname.capitalize}: #{value}"
  end

end