CarrierWave workaround: the files have to be saved manually

app/models/design.rb

@@ -17,55 +17,38 @@ class Design
   embeds_many :javascripts
   embeds_many :images
 
-  after_update :destroy_attrs
+  after_save :save_embedded_objects
   
   def javascripts=(*attrs)
-    self.attribute_models=(attrs<<'javascripts')
+    self.files = (attrs << 'javascripts')
   end
-
+  
   def stylesheets=(*attrs)
-    self.attribute_models=(attrs<<'stylesheets')
+    self.files = (attrs << 'stylesheets')
   end
-
+  
   def images=(*attrs)
-    self.attribute_models=(attrs<<'images')
+    self.files = (attrs << 'images')
   end
-
+  
   # Update or create the attribute_model records
-  def attribute_models=(attrs)
-      #attribute_models = eval(attributes[:type])
-     # if attributes.original_filename.blank?
-      attribute_models=eval(attrs.last)
-      a=attribute_models.build()
-      a.file=attrs[0]
-     # else
-     #   attribute_model = attribute_models.detect {|a| a.id.to_s == attributes[:id].to_s }
-     #   attribute_model.update_attributes(attributes)
-    #end
-  end
-
-  def is_built_in?
-    self.built_in
-  end
-  
-  def is_disabled?
-    self.disabled
-  end
-  
-  def get_enabled_attribute_models
-    self.attribute_models.excludes('disabled' => true)
+  def files=(attrs)
+    files = eval(attrs.last)
+    attrs[0].each do |a|
+      files.build(:file => a[:file], :to_save => true)
+    end
   end
   
   protected
   
-  # Destroy the i18n_variable for each attribute_models if marked to destroy
-  def destroy_attrs
-=begin
-    attribute_models.each do |a|
-      if a.should_destroy?
-         a.destroy_i18n_variable
+  def save_embedded_objects
+    [self.stylesheets, self.javascripts, self.images].each do |objects|
+      objects.each do |object|
+        if object.to_save
+          object.to_save = false
+          object.save
+        end
       end
     end
-=end
   end
 end

app/models/design_file.rb

@@ -2,5 +2,7 @@ class DesignFile
   include Mongoid::Document
 
   mount_uploader :file, AssetUploader
+  
+  field :to_save, :type => Boolean
 
 end

app/models/image.rb

@@ -1,3 +1,3 @@
-class Image<DesignFile
-
+class Image < DesignFile
+  embedded_in :design
 end

app/models/javascript.rb

@@ -1,3 +1,3 @@
-class Javascript<DesignFile
-
+class Javascript < DesignFile
+  embedded_in :design
 end

app/models/stylesheet.rb

@@ -1,5 +1,3 @@
 class Stylesheet < DesignFile
-  mount_uploader :file, AssetUploader
-
   embedded_in :design
 end