Clean code and workaround mongoid embedded with carrierwave

app/controllers/admin/designs_controller.rb

@@ -32,7 +32,6 @@ class Admin::DesignsController < ApplicationController
   end
 
   def update
-    params[:design][:existing_task_attributes] ||= {}
     @design = Design.find(params[:id])
     if @design.update_attributes(params[:design])
       flash[:notice] = "Successfully updated design and tasks."