usersテーブル

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

Association

• has_many :groups_users has_many :groups, through: :groups_users
• has_many :chats

groupsテーブル

Column	Type	Options
name	string	null: false

Association

• has_many :users, through: :groups_users has_many :groups_users
• has_many :chats

groups_usersテーブル

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

Association

• belongs_to :group
• belongs_to :user

chatsテーブル

Column	Type	Options
text	string
image	string
user	references	null: false, foreign_key: true
group	references	null: false, foreign_key: true

Association

• belongs_to :group
• belongs_to :user