finishing saving edited file online and redo dev.rake modification

app/controllers/admin/designs_controller.rb

@@ -25,7 +25,24 @@ class Admin::DesignsController < ApplicationController
 
   def edit_file
     @design = Design.find(params[:id])
-#    debugger
+    filename = params[:filename]
+    files = @design.stylesheets + @design.javascripts + @design.images
+    file_to_removed = files.find{ |obj|
+      obj.file_filename == filename
+    }
+    type = file_to_removed._type 
+    Dir.mktmpdir('design_temp'){ |dir|
+      temp_file = File.new(dir+'/'+filename,'w+')
+      temp_file.write params[:context]
+      replace_target = eval("@design.#{type.downcase.pluralize}")
+      a = replace_target.build(:file => temp_file,:to_save=>true)
+      debugger
+      file_to_removed.destroy
+      @design.save
+      debugger
+      temp_file.close
+    }
+    
   end
 
   def edit