From what I can tell, it is not possible to disable a fragment cache block based on conditions. One use for this that comes to mind is to not cache a particular fragment for admin users. Of course, I could cache a version of the fragment specifically for admins
<% cache :admin => logged_in? && current_user.is_admin? do -%>
What I'm thinking of looks like this on the surface
<% cache {}, :disabled => logged_in? && current_user.is_admin? do -%>
and it wouldn't be a big deal to implement. Only, I'm wondering whether there's another way to achieve the same out of the box.
Michael