DNDeployment::canView PHP Method

    public function canView($member = null)
    {
        return $this->Environment()->canView($member);
    }

 /**
  * Check if a DNDeployment exists and do permission checks on it. If there is something wrong it will return
  * an APIResponse with the error, otherwise null.
  *
  * @param \DNDeployment $deployment
  *
  * @return null|SS_HTTPResponse
  */
 protected function validateDeployment($deployment)
 {
     if (!$deployment || !$deployment->exists()) {
         return $this->getAPIResponse(['message' => 'This deployment does not exist'], 404);
     }
     if ($deployment->EnvironmentID != $this->environment->ID) {
         return $this->getAPIResponse(['message' => 'This deployment does not belong to the environment'], 403);
     }
     if (!$deployment->canView()) {
         return $this->getAPIResponse(['message' => 'You are not authorised to view this deployment'], 403);
     }
     return null;
 }