如何为用户模型创建一个表单，该表单可以在成功登录到应用程序后进行更新?

Requirement: I need to create an application where user can logged in and can change the background color of that page, can change the font of the page and it should persist with session. so I am trying to create form which accept those attributes from user and can save in database. I am using devise for authentication. I need to create an application wh