Database change notification insert or update

[Jean Regisser]

Hi,

I'm trying to see if there's a way to know if a document was inserted in the DB or just updated with a new revision.

Looking at the kCBLDatabaseChangeNotification on the iOS implementation, I see that there's an array of CBLDatabaseChange

that's passed with the notification. However I don't yet see a way to know if the change was an insertion or just an update.

Is it possible to know that?

Thanks!

[Jens Alfke]

On Dec 16, 2014, at 3:08 AM, Jean Regisser <jean.r...@gmail.com> wrote:

Looking at the kCBLDatabaseChangeNotification on the iOS implementation, I see that there's an array of CBLDatabaseChange

that's passed with the notification. However I don't yet see a way to know if the change was an insertion or just an update.

It depends on what exactly you mean by "insertion". Do you mean a first-generation document, or a document that's new to the local database?

You can detect a new (first-generation) document by looking at the revision history, checking whether doc.currentRevision.parentRevision == nil. Or a cheaper way to do the same thing is to see whether the revision ID begins with "1-" which means it's first-generation.

But the replicator will add documents to the local database that aren't first-generation. You can check the `source` property of the CBLDatabaseChange to see whether this revision was added by the replicator, but there isn't anything that tells you whether the document existed locally beforehand.

—Jens