Fix issue with chunkById.

src/Jenssegers/Mongodb/Eloquent/Builder.php

@@ -143,6 +143,14 @@ public function decrement($column, $amount = 1, array $extra = [])
         return parent::decrement($column, $amount, $extra);
     }
 
+    /**
+     * @inheritdoc
+     */
+    public function chunkById($count, callable $callback, $column = '_id', $alias = null)
+    {
+        return parent::chunkById($count, $callback, $column, $alias);
+    }
+
     /**
      * @inheritdoc
      */

src/Jenssegers/Mongodb/Query/Builder.php

@@ -600,6 +600,28 @@ public function decrement($column, $amount = 1, array $extra = [], array $option
         return $this->increment($column, -1 * $amount, $extra, $options);
     }
 
+    /**
+     * @inheritdoc
+     */
+    public function chunkById($count, callable $callback, $column = '_id', $alias = null)
+    {
+        return parent::chunkById($count, $callback, $column, $alias);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function forPageAfterId($perPage = 15, $lastId = 0, $column = '_id')
+    {
+        // When using ObjectIDs to paginate, we need to use a hex string as the
+        // "minimum" ID rather than the integer zero so the '$lt' query works.
+        if ($column === '_id' && $lastId === 0) {
+            $lastId = '000000000000000000000000';
+        }
+
+        return parent::forPageAfterId($perPage, $lastId, $column);
+    }
+
     /**
      * @inheritdoc
      */

tests/ModelTest.php

@@ -534,4 +534,18 @@ public function testGetDirtyDates()
         $user->birthday = new DateTime('19 august 1989');
         $this->assertEmpty($user->getDirty());
     }
+
+    public function testChunkById()
+    {
+        User::create(['name' => 'fork',  'tags' => ['sharp', 'pointy']]);
+        User::create(['name' => 'spork', 'tags' => ['sharp', 'pointy', 'round', 'bowl']]);
+        User::create(['name' => 'spoon', 'tags' => ['round', 'bowl']]);
+
+        $count = 0;
+        User::chunkById(2, function ($items) use (&$count) {
+            $count += count($items);
+        });
+
+        $this->assertEquals(3, $count);
+    }
 }