create new folder

app/components/modal/new_folder.js

 import Component from '@glimmer/component';
 import { tracked } from '@glimmer/tracking';
 import { action } from '@ember/object';
+import { inject as service } from '@ember/service';
 
 import { Modal } from 'bootstrap';
 
+
 export default class NewFolderComponent extends Component {
   @tracked title = '';
+  @service store;
 
   @action
   onSubmit() {
-    console.log(`title=${this.title}`);
+    let new_folder;
+
+    new_folder = this.store.createRecord('node');
+    new_folder.title = this.title;
+    new_folder.save();
+
     this.args.onClose();
     this.title = '';
   }

app/components/user/add.js

@@ -3,6 +3,7 @@ import { action } from '@ember/object';
 import { tracked } from '@glimmer/tracking';
 import { inject as service } from '@ember/service';
 
+
 class AddUserComponent extends Component {
   /*
   Form component to add new user.

app/models/node.js

@@ -3,6 +3,7 @@ import Model, { attr, hasMany, belongsTo } from '@ember-data/model';
 export default class NodeModel extends Model {
   @attr title;
   @attr model;
+  @belongsTo('folder', { inverse: null }) parent;
   @hasMany('node', { polymorphic: true }) descendants;
 
   get is_folder() {