What is more civilized to write in Ruby on Rails: @current_user.id or session[:user_id]?

Question

Ruby on Rails

Question about the cultural code.
After authorization, @current_user is given from the application controller.
There is also session[:user_id].
That's when you have to write the id of the current user, then I don’t know which one to choose:
@current_user.id or session[:user_id]
Which one is better?

Answer 1

In session, you don't know what the id is.
In current_user you have the id of the user that is initialized (exists in the database)
Use current_user