README

users Table

Column	Type	Options
email	string	null_false, unique: true
nickname	string	null_false, unique: true,index: true

Association

• has_many :messages
• has_many :group_users
• has_many :groups, through: :group_users

messages Table

Column	Type	Options
text	text	null_false
user_id	references	foreigh_key: true, null_false
group_id	references	foreigh_key: true, null_false

Association

• belongs_to :user
• belongs_to :group

groups Table

Column	Type	Options
name	string	null_false, unique: true

Association

• has_many :messages
• has_many :group_users
• has_many :users, through: :group_users

group_user Table

Column	Type	Options
user_id	references	foreigh_key: true, null_false
group_id	references	foreigh_key: true, null_false

Association

• belongs_to :user
• belongs_to :group