README

This README would normally document whatever steps are necessary to get the application up and running.

Things you may want to cover:

• Ruby version

• System dependencies

• Configuration

• Database creation

• Database initialization

• How to run the test suite

• Services (job queues, cache servers, search engines, etc.)

• Deployment instructions

• ...

DB設計

users table

Column	Type	Options
name	string	null: false, add_index: true
email	string	null: false

Association

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

messages table

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

Association

• belongs_to :user
• belongs_to :group

groups table

Column	Type	Options
name	string	null: false

Association

• has_many :users, through: :members
• has_many :messages

members table

Column	Type	Options
user_id	integer	null: false, add_index: true
group_id	integer	null: false

Association

• belongs_to :group
• belongs_to :user