フォロー・フォロワー機能 - Qiita

belongs_to :follower, class_name: "User" belongs_to :followed, class_name: "User" has_many :relationships,class_name: "Relationship", foreign_key: "follower_id",dependent: :destroy has_many :passive_relationships,class_name: "Relationship", foreign_key: "followed_id",dependent: :destroy has_many :followings, through: :relationships,source: :followed has_many :followers, through: :passive_relations