public static function map(BlogMember $blogMember, array $properties)
 {
     if (array_key_exists('member_id', $properties)) {
         $blogMember->setId($properties['member_id']);
     }
     if (array_key_exists('username', $properties)) {
         $blogMember->setUsername($properties['username']);
     }
     if (array_key_exists('email', $properties)) {
         $blogMember->setEmail($properties['email']);
     }
     if (array_key_exists('password', $properties)) {
         $blogMember->setPassword($properties['password']);
     }
 }