Solve optimistic concurrency issue without adding a `version` field

const userEmail = '[email protected]'
const movieName = 'Hidden Figures'

// Find the first available seat
// availableSeat.version might be 0
const availableSeat = await client.seat.findFirst({
  where: {
    Movie: {
      name: movieName,
    },
    claimedBy: null,
  },
})

if (!availableSeat) {
  throw new Error(`Oh no! ${movieName} is all booked.`)
}

// Only mark the seat as claimed if the availableSeat.version
// matches the version we're updating. Additionally, increment the
// version when we perform this update so all other clients trying
// to book this same seat will have an outdated version.
const seats = await client.seat.updateMany({
  data: {
    claimedBy: userEmail,
    version: {
      increment: 1,
    },
  },
  where: {
    id: availableSeat.id,
    version: availableSeat.version, // This version field is the key; only claim seat if in-memory version matches database version, indicating that the field has not been updated
  },
})

if (seats.count === 0) {
  throw new Error(`That seat is already booked! Please try again.`)
}

  where: {
    id: availableSeat.id,
    version: availableSeat.version, // This version field is the key; only claim seat if in-memory version matches database version, indicating that the field has not been updated
  },

  where: {
    id: availableSeat.id,
    claimedBy: null
  },