bug: error preparing Blob/File data to be stored in object store

[PeterBaker0]

Issue

iOS + Capacitor + Pouch - attachments storage causes intermittent app crash:

error preparing Blob/File data to be stored in object store

Related issues:

(latest): dexie/Dexie.js#1919
dexie/Dexie.js#1227
https://bugs.webkit.org/show_bug.cgi?id=188438
localForage/localForage#834

As in the top link, storing attachments into indexedDB as non blob e.g. B64 appears to resolve the issue (though less efficient). I cannot see an obvious way to more directly tell pouch in a given environment to not use blob storage.

Info

• Environment: Capacitor iOS
• Platform: Safari WebKit
• Adapter: indexeddb (I think)
• Server: CouchDB

Reproduce

We are seeing the issue intermittently and cannot reliably recreate.

[SourceR85]

Since the error is not reliably reproducible, could you please tell us under what conditions it occurs?

For example, does it occur more frequently during replication (retrieving attachments from a remote database) or when adding or bulk inserting attachments?

I have a general workaround in mind, but it would require more effort than writing a specific patch for this problem:
I considered some time ago whether OPFS might be better suited for attachments, but I never tested my hypothesis...