Refactor some readOnly attributes to have no type. Stop nesting plugin type fields. Refactor serializer/normalizer tests

addons/api/addon/models/host.js

@@ -1,34 +1,33 @@
 import GeneratedHostModel from '../generated/models/host';
 import { attr } from '@ember-data/model';
-import { fragmentArray } from 'ember-data-model-fragments/attributes';
 
 export default class HostModel extends GeneratedHostModel {
-  // =attributes (nested under attributes)
-  @fragmentArray('fragment-string', {
-    readOnly: true,
-    emptyArrayIfMissing: true,
-    isNestedAttribute: true,
-  })
-  ip_addresses;
+  // =attributes
 
+  // Static specific fields
   @attr('string', {
     description: 'The address (DNS or IP name) used to reach the host',
     isNestedAttribute: true,
   })
   address;
 
+  // Plugin specific fields
+  @attr({
+    readOnly: true,
+    emptyArrayIfMissing: true,
+  })
+  ip_addresses;
+
   @attr('string', {
     description: '',
     readOnly: true,
-    isNestedAttribute: true,
   })
   external_id;
 
   // Aws specific
-  @fragmentArray('fragment-string', {
+  @attr({
     readOnly: true,
     emptyArrayIfMissing: true,
-    isNestedAttribute: true,
   })
   dns_names;