We did something like this:
#app/models/user.rb
Class Model < ActiveRecord::Base
before_create :build_profile
end
This populates the profile record in the database, allowing you to update it later on
Once you've saved the user, you will be best using accepts_nested_attributes_for
to populate & save profile
options through a form for the user, like this:
#config/routes.rb
resources :users do
resources :profiles
end
#app/views/profiles/edit.html.erb
<%= form_for @profile do |f| %>
<%= f.hidden_field :user_id, current_user.id %>
<%= f.text_field :your_profile_options %>
<% end %>
This is a very basic way to do it, but hopefully will give you more ideas. If you want to see this in the wild, check out http://video-conference-demo.herokuapp.com (it uses Devise to handle users & has extra "profile" model too)