Replace parent-name mixin with simple getter and util

Author: chriskrycho

app/controllers/project-version/classes/class.js

@@ -5,14 +5,16 @@ import Controller from '@ember/controller';
 import { A } from '@ember/array';
 import { capitalize } from '@ember/string';
 import { isEmpty } from '@ember/utils';
-import ParentNameMixin from 'ember-api-docs/mixins/parent-name';
+import { parentName } from '../../../utils/parent-name';
 
 const filterTypes = ['inherited', 'protected', 'private', 'deprecated'];
 const DEFAULT_FILTER = 'inherited';
 
-export default class ClassController extends Controller.extend(
-  ParentNameMixin
-) {
+export default class ClassController extends Controller {
+  /** @type {import('@ember/routing/router-service').default} */
+  @service
+  router;
+
   @service
   filterData;
 
@@ -76,6 +78,10 @@ export default class ClassController extends Controller.extend(
     ];
   }
 
+  get parentName() {
+    return parentName(this.router.currentRouteName);
+  }
+
   @action
   updateFilter(filter) {
     this.toggleProperty(`filterData.${filter}`);

app/controllers/project-version/classes/class/index.js

@@ -1,10 +1,16 @@
 import { inject as service } from '@ember/service';
 import Controller from '@ember/controller';
-import ParentNameMixin from 'ember-api-docs/mixins/parent-name';
+import { parentName } from '../../../../utils/parent-name';
 
-export default class IndexController extends Controller.extend(
-  ParentNameMixin
-) {
+export default class IndexController extends Controller {
   @service
   filterData;
+
+  /** @type {import('@ember/routing/router-service').default} */
+  @service
+  router;
+
+  get parentName() {
+    return parentName(this.router.currentRouteName);
+  }
 }

app/mixins/parent-name.js

@@ -0,0 +1,3 @@
+export function parentName(routeName) {
+  return routeName.split('.').slice(0, 3).join('.');
+}