chat-space DB設計

usersテーブル

Column	Type	Options
email	string	null: false
password	string	null: false
name	string	null: false, unique: true, index: true

Association

• has_many :messages
• has_many :groups_users
• has_many :groups, through: :groups_users

messagesテーブル

Column	Type	Options
body	text
image	text
group_id	references	null: false, foreign_key: true
user_id	references	null: false, foreign_key: true

Association

• belongs_to :group
• belongs_to :user

groupsテーブル

Column	Type	Options
name	string	null: false, unique: true, index: true

Association

• has_many :messages
• has_many :groups_users
• has_many :users, through: :groups_users

groups_usersテーブル

Column	Type	Options
group_id	references	null: false, foreign_key: true
user_id	references	null: false, foreign_key: true

Association

• belongs_to :group
• belongs_to :user