feat: 🎸 add support for custom cancel session method

addons/api/addon/models/session.js

@@ -1,3 +1,27 @@
-import Model from '@ember-data/model';
+import GeneratedSessionModel from '../generated/models/session';
 
-export default class SessionModel extends Model { }
+export default class SessionModel extends GeneratedSessionModel {
+
+  // =methods
+
+  /**
+   * Cancels the session via the `cancel` method.
+   * See serializer and adapter for more information.
+   * @param {object} options
+   * @param {object} options.adapterOptions
+   * @return {Promise}
+   */
+  cancelSession(options = { adapterOptions: {} }) {
+    const defaultAdapterOptions = {
+      method: 'cancel',
+    };
+    return this.save({
+      ...options,
+      adapterOptions: {
+        ...defaultAdapterOptions,
+        ...options.adapterOptions,
+      },
+    });
+  }
+
+}