Unfinished fragment managed groups modeling

addons/api/addon/models/fragment-managed-groups-attributes.js

@@ -0,0 +1,13 @@
+import Fragment from 'ember-data-model-fragments/fragment';
+import { attr } from '@ember-data/model';
+
+export default class FragmentManagedGroupsAttributesModel extends Fragment {
+  // =attributes (OIDC)
+
+  @attr('string', {
+    description:
+      'The boolean expression filter to use to determine membership.',
+    defaultValue: () => 'OIDC',
+  })
+  filter;
+}

addons/api/addon/models/managed-groups.js

@@ -1,3 +1,12 @@
 import GeneratedManagedGroupModel from '../generated/models/managed-groups';
+import { attr } from '@ember-data/model';
+import { fragment } from 'ember-data-model-fragments/attributes';
 
-export default class ManagedGroupsModel extends GeneratedManagedGroupModel {}
+export default class ManagedGroupsModel extends GeneratedManagedGroupModel {
+  // =error attributes
+  @attr('string', { readOnly: true }) filter;
+
+  // =attributes
+  @fragment('fragment-managed-groups-attributes', { defaultValue: {} })
+  attributes;
+}