<%= render :partial => "common_details", :object => relation_details %> <% unless relation_details.relation_members.empty? %> <% end %> <% unless relation_details.containing_relation_members.empty? %> <% end %>

Members:	<%= render :partial => "relation_member", :collection => relation_details.relation_members %>
Part of:	<%= render :partial => "containing_relation", :collection => relation_details.containing_relation_members %>