usersテーブル(deviseのカラムを除く)

Column	Type	Options
name	string	null: false

Association

• has_many :chats, through: :chat_users
• has_many :chat_users
• has_many :messages

chatsテーブル

Column	Type	Options
name	string	null: false

Association

• has_many :users, through: :chat_users
• has_many :chat_users
• has_many :messages

chat_usersテーブル

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

Association

• belongs_to :user
• belongs_to :chat

messagesテーブル

Column	Type	Options
message	text	null: false
image	string
user_id	references	null: false, foreign_key:true
chat_id	references	null: false, foreign_key:true

Association

• belongs_to :user
• belongs_to :chat