protected function getListResource()
    {
        $items = $this->getListItems();
        $count = $items->count();
        /** @var string $treeClass */
        $treeClass = $this->config()->get('tree_class');
        $hal = [
            'count' => $count,
            'total' => $count,
            '_links' => [
                'self' => [
                    'href' => $this->Link('items')
                ]
            ],
            '_embedded' => [$treeClass => []]
        ];
        /** @var ChangeSet $item */
        foreach ($items as $item) {
            $sync = $this->shouldCampaignSync($item);
            $resource = $this->getChangeSetResource($item, $sync);
            $hal['_embedded'][$treeClass][] = $resource;
        }
        return $hal;
    }