Wizard: Server Side Validation + Finished Step

app/controllers/steps_controller.rb

@@ -9,7 +9,16 @@ class StepsController < ApplicationController
   def update
     updater = Wizard::StepUpdater.new(current_user, params[:id])
     updater.update(params[:fields])
-    render nothing: true
+
+    if updater.success?
+      render json: success_json
+    else
+      errors = []
+      updater.errors.messages.each do |field, msg|
+        errors << {field: field, description: msg.join }
+      end
+      render json: { errors: errors }, status: 422
+    end
   end
 
 end