Markdown notation used [#] Use as headline Font-size becomes smaller as the number increases. HTML h1~h6 tags
[| string |] Used as table creation By putting colons on the left, right, and right of the string, you can make them left-justified, centered, or right-justified.
[-] Use as bullets Insert a space after the hyphen
- has_many :room_users
- has_many :rooms, through :room_users
- has_many :messages
Since the columns and associations are self-explanatory, this is an essential task for application development.