fixing duplicate when updating design

app/models/design.rb

@@ -17,6 +17,7 @@ class Design
   embeds_many :javascripts
   embeds_many :images
 
+  before_save :cleanup_empty_fields
   after_save :procs_embedded_objects
   
   def javascripts=(*attrs)
@@ -40,10 +41,14 @@ class Design
   end
   
   protected
-  
+  def cleanup_empty_fields
+  end
   def procs_embedded_objects
     [self.stylesheets, self.javascripts, self.images].each do |objects|
       objects.each do |object|
+        if object.file.blank?
+          object.to_save = false
+        end
         if object.to_save
           object.to_save = false
           object.save