this post was submitted on 28 Oct 2023
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Memmy - An iOS client for Lemmy

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Lost all my settings with the new update (lemmy.sdf.org)
submitted 1 year ago by i_am_somebody@lemmy.sdf.org to c/memmy@lemmy.ml
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Hello. I got the new update today and when I opened the app it asked me to add an account. Weird… I did and then I realized it had wiped all my settings. Lost all filters, appearance configuration, everything.

I don’t know if they can be recovered but I want at least to warn other users to make a note of their settings before updating.

This is Memmy 1.0 on iOS.

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[–] richard_wagner@lemmy.world 3 points 1 year ago (1 children)

I also lost all my data.

Could you elaborate on the database migrations part, if you don’t mind?

Would the migration happen when the user opens the updated app for the first time, migrating all the old sql tables to the new schema?

I’m just interested from an operational standpoint.

[–] cypher_greyhat@lemmy.world 0 points 1 year ago

Yes, the migration happens when the user opens the new version of the app.

Basically you start versioning the database table schemas. If you modify tables, you say “If DB schema is moving from v2 -> v3, update these table columns in the following way…”.

This is what you’re meant to do, rather than dropping all existing tables (and data) when there’s a conflict. It’s tedious dev work but it avoids pissing off users. Using an “ORM” layer for the database can help make this sort of thing easier.

On the other hand, user preferences are probably not stored this way at all, and it’s the fact that a new app project was created from scratch that destroyed the existing user data. In Android, there’s libraries specifically for storing app user preferences that require almost no maintenance.