fix: resource IDs must be strings (#211)

* errors is a top level member

* Resource ID must be a string

Author: kureuil

src/packages/serializer/index.js

@@ -407,13 +407,13 @@ class Serializer {
     }
 
     let serialized: {
-      id: number,
+      id: string,
       type: string,
       links?: Object,
       attributes: Object,
       relationships?: Object
     } = {
-      id,
+      id: id.toString(),
       type,
       attributes
     };
@@ -519,7 +519,7 @@ class Serializer {
 
     return {
       data: {
-        id,
+        id: id.toString(),
         type
       },
 

test/integration/serializer.js

@@ -19,7 +19,7 @@ describe('Integration: class Serializer', () => {
   it('serializes id', () => {
     const { data: { id } } = subject;
 
-    expect(id).to.equal(1);
+    expect(id).to.equal('1');
   });
 
   it('serializes attributes', () => {