ruby on rails - erb to haml conversion to apply body class -

i have theses 2 line in erb

<body class="<%= yield (:body_class) %>"> <% content_for :body_class, "my_class" %>

i have tried

- content_for :body_class   my_class

for above haml conversion i'm not sure - correct or not ! , not able figure out haml conversion for

<body class="<%= yield (:body_class) %>">

any appreciated

you do:

%body{ class: "#{yield (:body_class)}" }

and

- content_for :body_class     my_class

Ben