diff --git a/web/gui/src/main/webapp/app/view/topo2/topo2Collection.js b/web/gui/src/main/webapp/app/view/topo2/topo2Collection.js
index 36f4264..11953e1 100644
--- a/web/gui/src/main/webapp/app/view/topo2/topo2Collection.js
+++ b/web/gui/src/main/webapp/app/view/topo2/topo2Collection.js
@@ -77,6 +77,9 @@
 
             return this;
         },
+        filter: function (comparator) {
+            return _.filter(this.models, comparator);
+        },
         _reset: function () {
             this._byId = [];
             this.models = [];