README groups_users テーブル Column Type Options user_id references null: false, foreign_key: true group_id references null: false, foreign_key: true Association belongs_to :group belongs_to :user messages テーブル Column Type Options text text image text user_id refernces null: false, foreign_key: true gropu_id refernces null: false, foreign_key: true Association belongs_to :group belongs_to :user users テーブル Column Type Options name string null: false, index: true password string null: false email string null: false Association has_many :groups, through: :groups_users has_many :messages has_many :groups_users groups テーブル Column Type Options name string null: false Association has_many :users, through: :groups_users has_many :messages has_many :groups_users
