Rails：在设计电子邮件视图中不能使用应用程序助手中定义的方法吗？

I created some sort of mini cms, and I am trying to call a function called render_content within the email confirmation view, but it just won't take it :( Alway complaining the method does not exist ? I am not sure what I am doing wrong here... Alex I created some sort of mini cms, and I am tryin