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class User < ActiveRecord::Base
#let's just make it simple and only add one column for this model called 'username'
attr_accessible :username
#use "follower_id" as the foreign key since by default it will use "user_id" which does
#not exist inside the "relationships" table
has_many :relationships, foreign_key: :follower_id
#find all user with the ID matching the "followed_user_ids" of the result. If I did not
#include "source: :followed_user", it will look for the column "following_id" which is wrong
has_many :followings, through: :relationships, source: :followed_user
#here we are just reversing the relationship. Instead of using "follower_id", we now use
has_many :inverse_relationships, class_name:"Relationship", foreign_key: :followed_user_id
#this line will look for the "follower_id" based on the result of the "inverse_relationships".
#no "source" option is required since we have used the "followers" in the association thus
#it looks for a "follower_id" on the "relationships" table which it does
has_many :followers, through: :inverse_relationships
class Relationship < ActiveRecord::Base
#Here, class_name just means that it's a User model.
belongs_to :follower, class_name: "User"
belongs_to :followed_user, class_name: "User"
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