/**
* return particular document
* @param $orgId
* @param $url
* @param $filename
* @return static
*/
public function getDocument($orgId, $url, $filename)
{
$data = ['url' => $url, 'org_id' => $orgId];
!$filename ?: ($data['filename'] = $filename);
return $this->document->firstOrNew($data);
}