destroy static file after destroy asset

app/models/asset.rb

@@ -10,11 +10,16 @@ class Asset
   
   before_validation :setup_filename
   after_save :save_static_file
+  after_destroy :delete_static_file
   
   def url
     "/assets/#{self.filename}"
   end
   
+  def location
+    "#{RAILS_ROOT}/public/assets/#{self.filename}"
+  end
+  
   protected
   
   def setup_filename
@@ -24,9 +29,13 @@ class Asset
   end
   
   def save_static_file
-    f = File.new("#{RAILS_ROOT}/public/assets/#{self.filename}", "wb")
+    f = File.new(self.location, "wb")
     f.write(self.data.file.read)
     f.close
   end
   
+  def delete_static_file
+    File.delete(self.location) rescue nil
+  end
+  
 end