What's the nature of “property” in a Ruby class?

Question

I don\'t understand the keywords like attr_reader or property in the following example:

class Voiture 
  attr_reader :name
  attr_         


        

Answer 1

Those are class methods, you can add them to a class, or create your own class that has addition methods. In your own class:

class Voiture
  def self.my_first_class_method(*arguments)
    puts arguments
  end
end

Or to add to a class:

Voiture.class_eval do
  define_method :my_second_class_method do |*arguments|
    puts arguments
  end
end

Once such a class method is defined, you can use it like this:

class VoitureChild < Voiture

    my_first_class_method "print this"

    my_second_class_method "print this"

end

There are also ways to do this by adding modules to a class, which is often how rails does such things, such as using a Concern.