Firestore transaction with multiple get

Question

I\'m trying to run a transaction with a variable number of read operations. I put the read () operations before than update ().

Reading the Firestore doc on https://clou

Answer 1

The Firestore doc doesn't say this, but the answer is hidden in the API reference: https://cloud.google.com/nodejs/docs/reference/firestore/0.13.x/Transaction?authuser=0#getAll

You can use Transaction.getAll() instead of Transaction.get() to get multiple documents. Your example will be:

const reservationCol = this.db.firestore.collection('reservations');
return this.db.firestore.runTransaction(t => {
  return t.getAll(reservationCol.doc('id1'), reservationCol.doc('id2'))
    .then(docs => {
      const id1 = docs[0];
      const id2 = docs[1];
      if (!(id1.exists && id2.exists)) {
        // do stuff
      } else {
        // throw error
      }
    })
}).then(() => console.log('Transaction succeeded'));