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Versions ======== If you are using Rails 2.3.8 or other version < 3, you have to use the version 1.1.x of this plugin, for Rails 3 you need to use the version 1.2.x or master of this plugin. ClassTableInheritance 1.2.0 =========================== This is an ActiveRecord plugin designed to allow simple multiple table (class) inheritance. This plugin was inspired by: inherits_from plugin => http://github.com/rwl4/inherits_from and Multiple Table Inheritance with ActiveRecord => http://mediumexposure.com/multiple-table-inheritance-active-record/ How to install ============== gem install class-table-inheritance Example Configuration ===================== # Migrations create_cti_table :product, :has_children => true do |t| t.string :description t.decimal :price t.timestamps end create_cti_table :book, :has_parent => :product, :has_children => true do |t| t.string :author end create_cti_table :novel, :has_parent => :book do |t| t.string :genre end create_cti_table :encyclopedia, :has_parent => :book do |t| t.string :editor end create_cti_table :videos, :has_parent => :product do |t| t.string :year t.string :genre end # Models class Product < ActiveRecord::Base has_children end class Book < ActiveRecord::Base has_parent :product end class Novel < ActiveRecord::Base has_parent :product end class Encyclopedia < ActiveRecord::Base has_parent :product end class Video < ActiveRecord::Base has_parent :product end Accessing children directly =========================== book = Book.find(1) book.name => "Agile Development with Rails" book.author => "Dave Thomas" book.price => 19.00 video = Video.find(2) video.name => "Inseption" video.year => "2010" video.genre => "SCI-FI" video.price => 22.00 book = Book.new book.name = "Hamlet" book.author = "Shakespeare, William" book.price => 14.00 book.save Accessing and searching children using parent ============================================= product = Product.find(1) # This is a Book instance. product.author product = Product.find(2) # This is a Video instance. product.genre Copyright (c) 2010-2011 Derrick Parkhurst Copyright (c) 2010 Bruno Cordeiro, released under the MIT license
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A plugin to make class table inheritance in Active Record.
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