add document model

app/adapters/application.js

+import JSONAPIAdapter from '@ember-data/adapter/json-api';
+
+export default class ApplicationAdapter extends JSONAPIAdapter {
+  namespace = 'api';
+
+  buildURL(...args) {
+    return `${super.buildURL(...args)}.json`;
+  }
+}
\ No newline at end of file

app/models/document.js

+import Model, { attr } from '@ember-data/model';
+
+export default class DocumentModel extends Model {
+  @attr title;
+  @attr image;
+}
\ No newline at end of file

app/routes/document.js

 import Route from '@ember/routing/route';
+import { inject as service } from '@ember/service';
 
 export default class RentalRoute extends Route {
-  async model(params) {
-    let response = await fetch(`/api/document/${params.document_id}.json`);
-    let { data } = await response.json();
 
-    let { attributes } = data;
-    let type = 'document';
+  @service store;
 
-    return { type, ...attributes };
+  async model(params) {
+    return this.store.findRecord('document', params.document_id);
   }
 }

app/routes/index.js

 import Route from '@ember/routing/route';
+import { inject as service } from '@ember/service';
+
 
 export default class IndexRoute extends Route {
-  async model() {
-    let response = await fetch('/api/nodes.json');
-    let { data } = await response.json();
 
-    return data.map((model) => {
-      let { attributes } = model;
-      let type = 'document';
+  @service store;
 
-      return { type, ...attributes };
-    });
+  async model() {
+    return this.store.findAll('document');
   }
 }

app/serializers/application.js

+import JSONAPISerializer from '@ember-data/serializer/json-api';
+
+export default class ApplicationSerializer extends JSONAPISerializer {
+    
+}
\ No newline at end of file

public/api/document/1.json

 {
     "data": {
         "type": "document",
-        "attributes": {
         "id": 1,
+        "attributes": {
             "title": "Invoice 1.pdf",
             "image": "https://upload.wikimedia.org/wikipedia/commons/c/cb/Crane_estate_(5).jpg"
         }

public/api/nodes.json → public/api/documents.json

@@ -2,16 +2,16 @@
     "data": [
         {
             "type": "document",
-            "attributes": {
             "id": 1,
+            "attributes": {
                 "title": "Invoice 1.pdf",
                 "image": "https://upload.wikimedia.org/wikipedia/commons/c/cb/Crane_estate_(5).jpg"
             }
         },
         {
             "type": "document",
-            "attributes": {
             "id": 2,
+            "attributes": {
                 "title": "Invoice 2.pdf",
                 "image": "https://upload.wikimedia.org/wikipedia/commons/c/cb/Crane_estate_(5).jpg"
             }