Subdoc Support

[zhanghaocong]

Hi naporin0624,

Any plans to support subdocuments? If so, could you outline a potential implementation approach? I’d be happy to assist in development.

[flbn]

^^^

[naporin0624]

Subdoc synchronization should work by creating a WebSocketProvider instance for each subdoc.guid. Since DurableObjects make it easy to scale websocket servers by ID, I think you can handle subdoc connections the same way as doc connections. (ref: https://docs.yjs.dev/api/subdocuments)

doc.on('subdocs', ({ loaded }) => {
  loaded.forEach(subdoc => {
    new WebrtcProvider(subdoc.guid, subdoc)
  })
})
doc.getSubdocs() // Get the Set<Y.Doc> of all subdocuments

If this works well, I'd be happy if you could create a PR to add it as an example.

If the increase in websocket connections per subdoc is a concern, the approach discussed here might be useful: https://discuss.yjs.dev/t/multiple-room-sync-subdocument/403/3