Execute command

rails generate migration CreateJoinTableAuthorBook author book
rails generate scaffold user username:string password:string salt:string email:string dm:boolean roles:string reviews_count:integer
rails generate scaffold author user:references name:string birth:date address:text ctype:string photo:binary
rails generate scaffold review book:references user:references body:text
rails generate scaffold fan_comment author_no:integer name:string body:text deleted:boolean
rails generate model memo memoable_type:string memoable_id:integer body:string