private function lokasi_file($value)
 {
     $unit_asal = unit::find($value['unit_asal']);
     $folder1 = $unit_asal['nama_unit'];
     $sub = Sub_jenis_dokumen::find($value['jenis_dokumen']);
     $folder2 = $sub['nama_sub'] . '(' . $sub['singkatan'] . ')';
     return $lokasi = $folder1 . '/';
 }