attr_initializer

attr_initializer.rb

class Class
  # Adds a initialize method, which takes attributes as a hash
  # Optionally call with symbol-names, to additionally create attribute accessors with `attr_accessor`
  def attr_initializer(*args)
    attr_accessor *args unless args.empty?
    module_eval <<-END
  def initialize(attributes = {})
    initialize_attributes(attributes)
  end
  def initialize_attributes(attributes = {})
    attributes.each do |k,v|
      sym = "#\{k}=".to_sym
      raise "Initialization of undefined attribute #\{k}" unless self.respond_to? sym
      self.__send__ sym, v
    end
  end
END
  end #m:attr_initializer
end