Displaying ActiveResource errors
Being a Rails newbie, I was pleased to learn that errors returned from an ActiveResource object can be displayed in exactly the same way as for an ActiveResource object, e.g:
<%= error_messages_for 'account' %>
Even better is to do something like the following:
<%= error_messages_for 'account', :header_message => "We couldn't update your billing information.", :message => "The following fields were problematic:", :header_tag => :h2 %>
which removes that terse “X errors prohibited this Y from being saved” and formats things a bit more nicely.