public function rollback($model_id, $reason = '', array $optional = [])
{
$previous = $this->getById($model_id);
return $this->create(['committer' => $previous->committer, 'committer_email' => $previous->committer_email, 'commit' => $previous->commit, 'project_id' => $previous->project_id, 'branch' => $previous->branch, 'reason' => $reason, 'optional' => $optional]);
}