usersテーブル

Column	Type	Options
id	integer	null: false, foreign_key: true, index: true, index: true
name	text	null: false, index: true
email	text	null: false, unique: true, index: true
encrypted_password	text	null: false
sign_in_count	integer	null: false
current_sign_in_at	datetime	null: false
last_sign_in_at	datetime	null: false
current_sign_in_ip	integer	null: false
last_sign_in_ip	integer	null: false
createrd_at	datetime	null: false, index: true
updated_at	datetime	null: false
group_id	integer	null: false, foreign_key: true

Association

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

groupテーブル

Column	Type	Options
id	integer	null: false, foreign_key: true, index: true
name	text	null: false, unique: true, index: true

Association

• has_many :user, through:members
• has_many :messages

messagesテーブル

Column	Type	Options
user_id	integer	null: false, foreign_key: true, index: true
text	text
image	text
createrd_at	datetime	null: false, index: true
updated_at	datetime	null: false

Association

• belongs_to :user

membersテーブル

Column	Type	Options
user_id	integer	null: false, foreign_key: true, index: true
group_id	integer	null: false, foreign_key: true, index: true

Association

• belongs_to :group
• belongs_to :user