public function put($key, Model $instance, array $attributes = ['*'])
{
if ($attributes != ['*'] && $this->has($key)) {
$instance = Model::merge($this->cache[$key]['instance'], $instance, $attributes);
$attributes = array_merge($this->cache[$key]['attributes'], $attributes);
}
$this->cache[$key] = ['instance' => $instance, 'attributes' => $attributes];
return $instance;
}