getAllNested for collections too. added treenodeobject interface

src/models/domain/treeNode.ts

@@ -1,8 +1,14 @@
-export class TreeNode<T> {
+export class TreeNode<T extends ITreeNodeObject> {
     node: T;
     children: Array<TreeNode<T>> = [];
 
-    constructor(node: T) {
+    constructor(node: T, name: string) {
         this.node = node;
+        this.node.name = name;
     }
 }
+
+export interface ITreeNodeObject {
+    id: string;
+    name: string;
+}