Drag and drop to reorder users

app/assets/javascripts/lib/items/items.js.erb

@@ -43,7 +43,7 @@ $(function(){
     placeholder: 'placeholder',
     startCollapsed: true,
     disableNesting: 'no-nest',
-    stop: function(event, ui) {
+    update: function(event, ui) {
       $.post("<%= Rails.application.routes.url_helpers.admin_update_position_path %>", { id: ui.item.attr('id'), parent_id: (ui.item.parent().closest('li').attr('id') || ui.item.parent().closest('ol').attr('id')), position: ui.item.index() } );
     }
   });