dealing with layout file bug

app/models/design.rb

@@ -11,7 +11,7 @@ class Design
   validates_presence_of :title
   validates_presence_of :author
 
-  embeds_one :layout
+  embeds_one :layout,:class_name=>Layout
   mount_uploader :structure_css, DesignFileUploader
 
   embeds_many :themes
@@ -20,7 +20,11 @@ class Design
 
   after_save :procs_embedded_objects
   after_destroy :del_embedded_objects
-  
+ 
+  def layout=(*attrs)
+    self.files = (attrs << 'layout')
+  end
+ 
   def javascripts=(*attrs)
     self.files = (attrs << 'javascripts')
   end
@@ -35,7 +39,12 @@ class Design
   
   # Update or create the attribute_model records
   def files=(attrs)
-    files = eval(attrs.last)
+    case attrs.last
+    when 'layout'
+      files = self.layout.build
+    else
+      files = eval(attrs.last)
+    end
     attrs[0].each do |a|
       if(a[:id]=='' && !a[:file].nil? )
         if(a[:file]!='')
@@ -53,14 +62,14 @@ class Design
   
   protected
   def del_embedded_objects
-    [self.themes, self.javascripts, self.images].each do |objects|
+    [self.layout,self.themes, self.javascripts, self.images].each do |objects|
       objects.each do |object|
         object.destroy
       end
      end
   end
   def procs_embedded_objects
-    [self.themes, self.javascripts, self.images].each do |objects|
+    [self.layout,self.themes, self.javascripts, self.images].each do |objects|
       objects.each do |object|
         if object.file.blank?
           object.to_save = false

app/models/layout.rb

@@ -4,7 +4,7 @@ class Layout < DesignFile
 
   attr_reader :content
   field :name, :index => true
-  references_many :children, :class_name => "Item"
+#  references_many :children, :class_name => "Item"
   has_many :layout_parts
 
   validates_presence_of :name

app/views/admin/designs/_form.html.erb

@@ -18,9 +18,9 @@
 <p>
 <%= f.label "layout", t('admin.layout') %>
 <%  if @design.layout.blank? %>
-    <%= f.file_field :layout_file %>
+    <%= f.file_field :layout %>
   <% else%>
-    <%= File.basename (Design.all.last.layout.url)  %>
+    <%= File.basename (@design.layout.file.url)  %>
 <% end %> 
 </p>
 <p>

app/views/layouts/admin.html.erb

@@ -32,7 +32,6 @@
       
       <ul id="nav">
           <li><%= link_to t('homepage'), root_path %></li>
-          <li><%= link_to t('admin.item'), admin_items_path %></li>
           <li><%= link_to t('admin.layout'), admin_layouts_path %></li>
           <li><%= link_to t('admin.design'), admin_designs_path %></li>
           <li><%= link_to t('admin.asset'), admin_assets_path %></li>