EnekoEnekoRuiz.Ruiz.

export const getPlayers = async (req, res) => {
  try {
    const { name, team, position } = req.query;
    const filter = {};
    if (name) filter.name = { $regex: name, $options: 'i' };
    if (team) {
      const teamDoc = await Team.findOne({ name: { $regex: team, $options: 'i' } });
      if (teamDoc) filter.teamId = teamDoc._id;
    }

@WebMethod
public synchronized BookingResult reserveSeat(String rideId, String userId, int seat) {
  EntityTransaction tx = em.getTransaction();
  try {
    tx.begin();
    Ride ride = em.find(Ride.class, rideId, LockModeType.PESSIMISTIC_WRITE);
    if (ride.getSeats().get(seat).isOccupied()) {
      tx.rollback();
      return BookingResult.error("Taken");

@Injectable()
export class ParkingService {
  async reserveSpot(spotId: string, userId: string, currentVersion: number) {
    const result = await this.db.spots.updateOne(
      { _id: spotId, version: currentVersion, status: 'AVAILABLE' },
      { $set: { status: 'OCCUPIED', reservedBy: userId, reservedAt: new Date() }, $inc: { version: 1 } }
    );
    if (result.modifiedCount === 0) throw new ConcurrencyException('Spot already updated');
    return { ok: true, spotId, reservedBy: userId };