Store the remote host from which the preference originated

app/controllers/application_controller.rb

@@ -2,4 +2,11 @@ class ApplicationController < ActionController::Base
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.
   protect_from_forgery with: :exception
+
+  protected
+
+  def current_ip_address
+    # request.env['HTTP_X_FORWARDED_FOR'] ||
+    request.remote_ip
+  end
 end

app/controllers/talk_preferences_controller.rb

@@ -10,6 +10,7 @@ class TalkPreferencesController < ApplicationController
 
   def create
     @talk_preference = TalkPreference.new talk_preference_params
+    @talk_preference.ip_address = current_ip_address
 
     if @talk_preference.save
       render json: {