Yield and default case || do not output default case

Question

I have a simple yield use case and for some unknown reason the default case is never shown:

In my super_admin layout I have:

<%= yield :body_id || \'s         


        

Answer 1

Use parentheses:

<%= (yield :body_id) || 'super_admin_main' %>

Or

<%= yield(:body_id) || 'super_admin_main' %>

Without them it is assuming yield (:body_id || 'super_admin_main')

EDIT: Rails 3 uses ActiveSupport::SafeBuffer instead of string/nil (Rails 2), so the output is not nil even if there is no content_for provided. So try:

<%= yield(:body_id).empty? ? 'super_admin_main' : yield(:body_id)%>