presentation version

app/adapters/application.js

@@ -0,0 +1,9 @@
+import JSONAPIAdapter from '@ember-data/adapter/json-api';
+
+export default class ApplicationAdapter extends JSONAPIAdapter {
+    namespace = 'api';
+
+  buildURL(...args) {
+    return `${super.buildURL(...args)}.json`;
+  }
+}