YSKh616 / chat-space

DB設計

users table

Column	Type	Options
name	string	index: true, null: false, unique: true
mail	string	null:false

Association

• has_many: groups, through: groups_users
• has_many: messages
• has_many: groups_users

groups table

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

Association

• has_many: users, through: groups_users
• has_many: messages
• has_many: groups_users

groups_users table

Column	Type	Options
user_id	integer	foreign_key: true
group_id	integer	foreign_key: true

Association

• belongs_to: user
• belongs_to: group

messages table

Column	Type	Options
body	text	null: false
image	string	null: false
user_id	integer	null: false, foreign_key: true
group_id	integer	null: false, foreign_key: true

Association

• belongs_to: user
• belongs_to: group