[RUBY] DB design with markdown notation [55 days left]

Markdown notation used [#] Used as a heading Font-size becomes smaller as the number increases H1 ~ h6 tags in HTML

[|String|] Used to create a table You can align left, center, and right by attaching a colon to the left, left, right, and right of the string.

[-] Used as a bullet Insert a half-width space after the hyphen

Table design

users table

Association

• has_many :room_users
• has_many :rooms, through :room_users
• has_many :messages

Since the columns and associations are clear at a glance, this is an essential task for application development.