テーブル設計

users テーブル

Column	Type	Options
name	string	null: false
email	string	null: false
password	string	null: false

Association

• has_many :room_users
• has_many :rooms, through: room_users
• has_many :messages

rooms テーブル

Column	Type	Options
name	string	null: false

Association

• has_many :room_users
• has_many :users, through: room_users
• has_many :messages

room_users テーブル

Column	Type	Options
user	references	null: false, foreign_key: true
room	references	null: false, foreign_key: true

Association

• belongs_to :room
• belongs_to :user

messages テーブル

Column	Type	Options
content	string
user	references	null: false, foreign_key: true
room	references	null: false, foreign_key: true

Association

• belongs_to :room
• belongs_to :user