Automerge persister clears the document contents on startup

[wilkerlucio]

Describe the bug

Hi, I'm doing a setup using Tinybase and automerge, and I notice I couldn't get the persistence from automerge to works.

I debug it, and I notice it was saving properly, but when I was reading it, the store always came back clean.

I traced it down to this first line in the createAutomergePersister code:

tinybase/src/persisters/persister-automerge/index.ts

Line 138 in ae593db

docHandle.change((doc: any) => (doc[docObjName] = {}));

So on start, it causes a new transaction that clears all the contents in the document.

I did a simple fix as (note the replacement of = with ||=):

docHandle.change((doc) => (doc[docObjName] ||= {}));

So this way I can start tinybase with an automerge doc that always has data.

Platform

• OS: All
• Browser: All
• Version: 5.1.2

[jamesgpearce]

Wow that's a bit embarrassing! Let me check that out and roll a fix.

[jamesgpearce]

Fixed and test cases in v5.1.4. Wanna check it out?

[wilkerlucio]

Just tested, working great, thank you!