def _expand_url(url)
      case url
      when String, Symbol
        respond_to?(url) ? send(url) : url
      when Proc
        url.call(self)
      else
        url
      end
    end
def _expand_url(url)
      case url
      when String, Symbol
        respond_to?(url) ? send(url) : url
      when Proc
        url.call(self)
      else
        url
      end
    end
Expand url in the current context of the view

 @api private