Tobscure\JsonApi\Document::mergeResource PHP Method

    protected function mergeResource(array $resources, Resource $newResource)
    {
        $type = $newResource->getType();
        $id = $newResource->getId();
        if (isset($resources[$type][$id])) {
            $resources[$type][$id]->merge($newResource);
        } else {
            $resources[$type][$id] = $newResource;
        }
        return $resources;
    }