bot challenge for signup

app/controllers/registrations_controller.rb

@@ -6,9 +6,15 @@ class RegistrationsController < Devise::RegistrationsController
   prepend_before_action :authenticate_scope!, only: [:edit_email]
 
 
+  def new
+    build_resource
+    super
+  end
   # POST /resource
   def create
-    puts "CREATE"
+    if message = math_check
+      flash.now.alert = message
+    end
     super
   end
 
@@ -28,16 +34,24 @@ class RegistrationsController < Devise::RegistrationsController
     super
   end
 
-  def resource_name
-    "member"
-  end
-
   # DELETE /resource
   # def destroy
   #   super
   # end
 
-  # protected
+  protected
+
+  def math_check
+    return "no cheatin" unless bot = params[:bot]
+    return "No food" unless fudder = bot[:fudder]
+    key = fudder.to_i / 2
+    answer = bot[:challenge]
+    return "Plase enter the bot challenge" if answer.blank?
+    if( (2*key + 1).to_s != answer )
+      return "Check the maths, tip, it wasn't #{answer}"
+    end
+    nil
+  end
 
   # If you have extra params to permit, append them to the sanitizer.
   # def configure_sign_up_params