Followers in Rails

followings.rb

class Followings < ActiveRecord::Base
  attr_accessible :user_id, :follower_id
  belongs_to :user
  belongs_to :follower, class_name: 'User'
  belongs_to :following, class_name: 'User', foreign_key: :user_id

  validates_uniqueness_of :user_id, scope: :follower_id
end

users.rb

class Users < ActiveRecord::Base
  has_many :match_followers, class_name: 'Followings', foreign_key: 'user_id'
  has_many :match_following, class_name: 'Followings', foreign_key: 'follower_id'
  has_many :followers, through: :match_followers
  has_many :following, through: :match_following
end