CODEWITHSUNDEEP
firebasegoogle-cloud-firestore
Urchboy
Urchboy

Reputation: 865

Pricing: is multiple field changes in a firestore document cache seen as a single write when device is online?

I have a use case where I log each activity open count in a firestore document (activity_name->field, and count->value)... So I wanted to know, when the user is offline and each of his activity navigation is stored in firestore cache, as soon as the user gets online and firebase sdk syncs the changes to the main database, does firestore record the synced changes as a single write or it sees the various individual field changes since the last change and record as multiple writes?

Upvotes: 2

Views: 235

Answers (1)

Doug Stevenson
Doug Stevenson

Reputation: 317362

The writes are queued up in the client and delivered individually, so there will be a cost of one write for each document that was written offline.

The important issue here is not so much the billing as it is the evaluation of security rules. It's entirely possible a series of 5 writes might actually only result in 4 successful writes and 1 failure due to the violation of a security rule. If those writes were actually compressed into a single write, that would potentially cause everything to fail, which would be undesirable (you'd likely want as many writes to succeed as possible).

Upvotes: 3

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