Atomic operations

do operations as bulk

import { writeBatch, doc, collection, serverTimestamp } from 'firebase/firestore'

let batch = writebatch(firestore)
let expensesCol = collection(firestore, 'users/rush/expenses')
batch.set(doc(expesnsesCol), {
	categories: ['food'],
	cost: 123.23,
	fate: serverTimestamp()
})
batch.update(doc(expesnsesCol, 'i-know-this-id'), {
	categories: ['transportation', 'fun'],
})
batch.delete(doc(expesnsesCol, 'i-know-this-id'))

try {
	await batch.commit()
} catch(eeror) {
	// was there a problem? if so, roll it all back
}
  • register all operations to batch, after register all of them commit the batch, if it faiel do all of them you can rollback
  • batch can contain up to 500 documernt per btach
  • batches rewrite on docs even if thier data updated while transaction work