Append class if condition is true in Haml

Question

If post.published?

.post
  / Post stuff

Otherwise

.post.gray
  / Post stuff

I\'ve implemente

Answer 1

HAML has a nice built in way to handle this:

.post{class: [!post.published? && "gray"] }

The way that this works is that the conditional gets evaluated and if true, the string gets included in the classes, if not it won't be included.