feat: 🎸 add support for custom cancel session method

addons/api/addon/generated/models/session.js

@@ -27,4 +27,9 @@ export default class GeneratedSessionModel extends BaseModel {
   })
   updated_time;
 
+  @attr('number', {
+    description: 'Current version number of this resource.',
+  })
+  version;
+
 }

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,
+      },
+    });
+  }
+
+}

addons/api/addon/serializers/session.js

@@ -0,0 +1,31 @@
+import ApplicationSerializer from './application';
+
+export default class SessionSerializer extends ApplicationSerializer {
+  // =methods
+
+  /**
+   * If `adapterOptions.method` is `cancel`, the serialization should
+   * include the version field only.
+   * @override
+   * @param {Snapshot} snapshot
+   * @return {object}
+   */
+  serialize(snapshot) {
+    let serialized = super.serialize(...arguments);
+    if (snapshot?.adapterOptions?.method === 'cancel') {
+      serialized = this.serializeForCancel(snapshot);
+    }
+    return serialized;
+  }
+
+  /**
+   * Returns a payload containing only version
+   * @param {Snapshot} snapshot
+   * @return {object}
+   */
+  serializeForCancel(snapshot) {
+    return {
+      version: snapshot.attr('version'),
+    };
+  }
+}

addons/api/app/serializers/session.js

@@ -0,0 +1 @@
+export { default } from 'api/serializers/session';

addons/api/tests/unit/serializers/session-test.js

@@ -0,0 +1,31 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+
+module('Unit | Serializer | session', function(hooks) {
+  setupTest(hooks);
+
+  // Replace this with your real tests.
+  test('it exists', function(assert) {
+    let store = this.owner.lookup('service:store');
+    let serializer = store.serializerFor('session');
+
+    assert.ok(serializer);
+  });
+
+  test('it serializes only version when `adapterOptions.method` is `cancel`', function (assert) {
+    assert.expect(1);
+    const store = this.owner.lookup('service:store');
+    const serializer = store.serializerFor('session');
+    const record = store.createRecord('session', {
+      version: 1,
+    });
+    const snapshot = record._createSnapshot();
+    snapshot.adapterOptions = {
+      method: 'cancel',
+    };
+    const serializedRecord = serializer.serialize(snapshot);
+    assert.deepEqual(serializedRecord, {
+      version: 1,
+    });
+  });
+});