title: Rails: :before_return?
body: <p>This question has probably been asked before, but I was wondering if there was a mechanism that allows me to to the opposite of <code>:before_save</code>?</p>
  
  <p>eg</p>
  
  <pre><code>class MyObject &lt; ActiveRecord::Base
  
      before_return :split_tags
  
      def split_tags
          self.tags = self.tags.split(',')
      end
  
  end
  </code></pre>
  
  <p>I am saving tags of MyObject into a database, separated by commas. When asking for the MyObject back from the database, I'd like the tags to become an array.</p>