README

usersテーブル

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

Association

• has_many :members
• has_many :groups through :members
• has_many :messages

messagesテーブル

Column	Type	Options
body	text
image	string
user	reference	null: false, foreign_key: true
group	reference	null: false, goreign_key: true

Association

• belongs_to :user

groupsテーブル

Column	Type	Options
name	string	null: false

Association

• has_many :users, through :members
• has_many :members
• has_many :messages

membersテーブル

Column	Type	Options
user	reference	null: false, foreign_key: true
group	reference	null: false, foreign_key: true

Association

• belongs_to :group
• belongs_to :user