soulnafein soulnafein - 7 months ago 24
Ruby Question

Relationship like Twitter followers/followed in ActiveRecord

I'm trying to represent a relationship between users in my application where a user can have many followers and can follow other users.
I would like to have something like user.followers() and user.followed_by()
Could you please tell me in details how to represent this using ActiveRecord?

Thanks.

Answer

You need two models, a Person and a Followings

rails generate model Person name:string
rails generate model Followings person_id:integer follower_id:integer blocked:boolean

and the following code in the models

class Person < ActiveRecord::Base
  has_many :followers, :class_name => 'Followings', :foreign_key => 'person_id'
  has_many :following, :class_name => 'Followings', :foreign_key => 'follower_id' 
end

and corresponding in the Followings class you write

class Followings < ActiveRecord::Base
  belongs_to :person
  belongs_to :follower, :class_name => 'Person'
end

You could make the names clearer to your liking (i especially don't like the Followings-name), but this should get you started.