Ruby/Class/Writable Attributes

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Creating Writable Attributes: using an accessor method followed with an equals sign (=)

class Animal
  attr_reader :color
  def color=(color)
    @color = color
  end
  def initialize(color)
    @color = color
  end
end
animal = Animal.new("brown")
puts "The new animal is " + animal.color
animal.color = "red"
puts "Now the new animal is " + animal.color



Ruby gives you a quick way to create writable attributes with attr_writer

class Animal
  attr_reader :color
  attr_writer :color
  def initialize(color)
    @color = color
  end
end
animal = Animal.new("brown")
puts "The new animal is " + animal.color
animal.color = "red"
puts "Now the new animal is " + animal.color
Источник — «http://www.wiki.crossplatform.ru/index.php/Ruby/Class/Writable_Attributes»