How to create a multi-step registration using Omniauth?

Question

Ruby on Rails

There was a need to add login/registration via omniauth, but after logging in, the user must complete their profile.
The general scheme is as follows: the user logs in to the site through omniauth > if he enters for the first time, then he is shown a form with additional fields > after filling in the fields, the user presses the registration button and only now a new record is created in the database.

Answer 1

You make a request. You receive data.
You check.
If the user appeared for the first time, then you render a form from your action to him, for example:
In this form, he enters more data.
You create action accepting this form and you accept the data. Etc. Render him at least a thousand views.
If he left halfway before he filled in everything he needed, you can hang up a check, for example, in application_controller for the data of the current user and whether everything is filled in or not. Proceeding from logic you render the necessary form.

Answer 2

AND? Where to add fields? There are no fields in Omniauth. Add whatever you want to the user`a model. After authentication through the provider, redirect the user to where you want too