Add pageSize to metadata.

addon/serializers/drf.js

@@ -47,7 +47,8 @@ export default DS.RESTSerializer.extend({
       store.metaForType(type, {
         count: payload.count,
         next: this.extractPageNumber(payload.next),
-        previous: this.extractPageNumber(payload.previous)
+        previous: this.extractPageNumber(payload.previous),
+        pageSize: payload.results.length
       });
 
       // Keep ember data from trying to parse the metadata as a records

tests/integration/pagination-test.js

@@ -114,7 +114,7 @@ module('Pagination', {
  * https://stackoverflow.com/questions/26317855/ember-cli-how-to-do-asynchronous-model-unit-testing-with-restadapter
  */
 test('Retrieve list of paginated records', function() {
-  expect(8);
+  expect(9);
 
   stop();
   Ember.run(function() {
@@ -133,6 +133,7 @@ test('Retrieve list of paginated records', function() {
       equal(metadata.count, 6);
       equal(metadata.next, 2);
       equal(metadata.previous, null);
+      equal(metadata.pageSize, 4);
 
       // No metadata on results when using find without query params.
       ok(!response.get('meta'));
@@ -144,7 +145,7 @@ test('Retrieve list of paginated records', function() {
 
 
 test("Type metadata doesn't have previous", function() {
-  expect(5);
+  expect(6);
 
   stop();
   Ember.run(function() {
@@ -156,6 +157,7 @@ test("Type metadata doesn't have previous", function() {
       equal(metadata.count, 6);
       equal(metadata.next, 2);
       equal(metadata.previous, null);
+      equal(metadata.pageSize, 4);
 
       // No metadata on results when using find without query params.
       ok(!response.get('meta'));
@@ -194,7 +196,7 @@ test("Type metadata doesn't have next", function() {
 
 
 test("Test page_size query param", function() {
-  expect(8);
+  expect(10);
 
   stop();
   Ember.run(function() {
@@ -207,12 +209,14 @@ test("Test page_size query param", function() {
       equal(typeMetadata.count, 6);
       equal(typeMetadata.previous, 1);
       equal(typeMetadata.next, 3);
+      equal(typeMetadata.pageSize, 2);
 
       // Test the results metadata.
       var resultsMetadata = response.get('meta');
       equal(resultsMetadata.count, 6);
       equal(resultsMetadata.previous, 1);
       equal(resultsMetadata.next, 3);
+      equal(resultsMetadata.pageSize, 2);
 
       start();
     });

tests/unit/serializers/drf-test.js

@@ -81,15 +81,15 @@ test('extractMeta', function() {
   var serializer = this.subject();
   var store = { metaForType: sinon.spy() };
   var payload = {
-    results: 'mock',
+    results: ['mock', 'results'],
     count: 'count',
     next: '/api/posts/?page=3',
     previous: '/api/posts/?page=1'
   };
 
   serializer.extractMeta(store, 'type', payload);
 
-  ok(store.metaForType.calledWith('type', {count: 'count', next: 3, previous: 1}),
+  ok(store.metaForType.calledWith('type', {count: 'count', next: 3, previous: 1, pageSize: 2}),
     'metaForType not called properly');
   ok(!payload.count, 'payload.count not removed');
   ok(!payload.next, 'payload.next not removed');