Migration from SwiftData

[bradr3d]

Hi! This is widely touted as a good alternative to SwiftData, but there's no documentation on how to potnetially migrate from SwiftData to this? Is it possible?

[mbrandonw]

Hi @bradr3d, we have no documentation on this because it's quite a large undertaking to completely change out the underlying persistence and querying mechanism for your app, regardless of the libraries involved. It would be equally hard to migrate a SQLiteData app to a SwiftData app too.

It's technically possible, but it's going to be difficult. The only approach that comes to mind is to recreate all of your SwiftData models as SQLite tables and then perform a one-time migration that loads all of your SwiftData rows into memory and insert them into your new SQLite tables.

Maybe others in the community have some other ideas.

[davidakoontz]

I'm pondering the SwiftData -> SQLiteData for my App (Stock Portfolio Equity Curve - PortfolioEC for short name).

My first few thoughts have been NO Migration - just make an incompatible new version.

• this works for me and my app as I'm looking a ZERO paid subscription (no users yet - that a different problem).
• this leaves me with a question: How do I clean up the possible old DB on a trial users device?
  o I assume I could look for the old SwiftData DB (App location) and delete it in the new version.
  o I could just ignore and forget it ... only a few 100 KB - wonder if Apple has a reaper policy?

A manual CSV Export & CSV Import

• this is a very real possibility as the majority of user data is the Stock Transaction which I've got a CSV Export / Import function already. Most of the DB is with the daily snapshots of account aggregate totals.
• still leaves the question of old DB clean up

Delete old version App - Fresh Install new version App

• given Zero Users - this is a clear winner
• still leaves the question of old DB clean up

Upgrade old version 2.xxx to new version 3.xx

• does the App Store deal with removing the DB and User Defaults? (I think so...Testable)
• I've attempted this path.... the new App works... but Apple's CloudKit DB web tool still shows existing DB records
  o https://icloud.developer.apple.com/dashboard/

I will be investigating some/all of these options. But open to other's experience/knowledge.

David Koontz
(PortfolioEC App)