Ruby on Rails - self referential association in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails
- Self-referential association is used to associate a model with itself.
- The most frequent example would be, to manage association between a friend and his follower.
Example
rails g model friendship user_id:references friend_id:integerClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
We can associate models like:
class User < ActiveRecord::Base
has_many :friendships
has_many :friends, :through => :friendships
has_many :inverse_friendships, :class_name => "Friendship", :foreign_key => "friend_id"
has_many :inverse_friends, :through => :inverse_friendships, :source => :user
endClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
Other model will look like:
class Friendship < ActiveRecord::Base
belongs_to :user
belongs_to :friend, :class_name => "User"
end