From: Damjan Rems <lists@...>
Date: 2013-01-10T07:12:31+09:00
Subject: Extending class

In Ruby it is possible to extend module, but not class. I am working on
a mongoid rails application where one collection(table) is defined like:

class User
   include Mongoid::Document

   field :username, type: String
   field :title, type: String
end

In my scenario somewhere in the future someone would make a gem, which
would need to extend User class. I found out that it can be done this
way:

User::field :signature, type: String
User::belongs_to :visit
User::embeds_many :roles

but it is kinda ugly. Then I realize that extend keyword exists, but it
is possible to extend only modules not classes. So this realy nice
example would work only if User is a module.

class UserForForum
 extend User

 field :signature, type: String

 belongs_to :visit
 embeds_many :roles
end

Is there a clear way of extending classes?


by
TheR

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