overriding redirect_to behavior with devise update method
===

What I thought would be a simple problem is giving me some trouble. I have an application with Devise/Omniauth for authentication. When a new user signs up and logs in, I want them to be directed to a couple of questions (in succession) asking:

1. what beverages do they like? (coffee, drink, both)
2. what neighborhoods are convenient for them?

My user model has a "preferred_beverage" attribute along with three preferred_neighborhood_# attributes (preferred_neighborhood_one, preferred_neighborhood_two, preferred_neighborhood_three). 

When a user signs in, I want to check if they are a new user and if so, direct them to a page with question 1:

    <div class="center hero-unit">
      <h2>What do you like to drink?</h2>
    
        <%= form_for(resource, :as => resource_name, :url => registration_path(resource_name), :html => { :method => :put }) do |f| %>
    
        <%= f.radio_button :preferred_beverage, 'Coffee', :checked => true %> 
        <%= label :preferred_beverage, 'Coffee' %>
        <%= f.radio_button :preferred_beverage, 'Drink' %> 
        <%= label :preferred_beverage, 'Drink' %>
        <%= f.radio_button :preferred_beverage, 'Both' %> 
        <%= label :preferred_beverage, 'Both' %>
    
        <%= f.submit "Next", class: "btn btn-large btn-primary" %>
    
      <% end %>
    </div>

The problem is that, upon submitting this form, even though the user's "preferred_beverage" attribute is saving, I cannot properly overwrite the default Devise "update" method, which seems to be handling any modifications to User and redirecting to the root_path. I want to redirect straight to my /app/views/neighborhood_survey/new.html.erb form upon submission of the 'preferred_beverage'.

What exactly do I need to put in the "update" section of this registrations_controller.rb that I am using to override the default Devise registrations_controller?

app/controllers/registrations_controller.rb

    class RegistrationsController < Devise::RegistrationsController
      
      def create
        super
        session[:omniauth] = nil unless @user.new_record?
      end
    
      def update
      end
    
      private
      def build_resource(*args)
        super
        if session[:omniauth]
          @user.apply_omniauth(session[:omniauth])
          @user.valid?
        end
      end
    end

I completed the below to ensure that my registrations_controller was overwriting the Devise registrations controller with the following:

    routes.rb
    
        devise_for :users, path_names: {sign_in: "login", sign_out: "logout"},
                           controllers: {omniauth_callbacks: "omniauth_callbacks", :registrations => "registrations"}

Any input is appreciated!
Thank you.