Saving Data on Android

batched write
. Batched write allows you 
to perform a bunch of writes all at once, in other words, in a batch. It works in a way 
that you specify what you want to change and tell the SDK to change it. You don't 
have to worry about what happens if the operation fails halfway through. None of 
the changes will be applied in that case. Also, another user won't be able to change 
that same data that you are currently changing because those write operations are 
atomic
 which means that the operation is guaranteed to be isolated from other 
operations that may be happening at the same time. Batch operation is also much 
more efficient than doing many individual write operations. A good use case for 
batch write is when you want to change many related documents and your new value 
does not depend on the old value.
To learn more about transactions and batched writes check out the official 
documentation: 
https://firebase.google.com/docs/firestore/manage-data/
transactions
.
Saving Data on Android
Chapter 17: Managing Data with Cloud Firestore
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