ruby - Haml:如果在 Haml 中条件为真，则追加类

Question

如果 post.published?

.post
  / Post stuff

否则

.post.gray
  / Post stuff

我已经用 rails helper 实现了它，但它看起来很丑。

= content_tag :div, :class => "post" + (" gray" unless post.published?).to_s do
  / Post stuff

第二种变体:

= content_tag :div, :class => "post" + (post.published? ? "" : " gray") do
  / Post stuff

是否有更简单且特定于 haml 的方法？

更新。特定于 Haml，但仍然不简单:

%div{:class => "post" + (" gray" unless post.published?).to_s}
  / Post stuff

Answer 1

.post{:class => ("gray" unless post.published?)}