getUser method
Implementation
User? getUser() {
if (fromUser != null) { return fromUser; }
if (toUser != null) { return toUser; }
if (newFan != null) { return newFan; }
if (friendInfo != null) { return friendInfo; }
if (newFriend != null) { return newFriend; }
if (owner != null) { return owner; }
return null;
}