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Evan K. StoneSwift Developers and Indies! 📣 Join us for the Swift Developer Goals meeting today at 12:30PM PT:💻 Sign up at <a href="https://swiftremotestudio.com" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://swiftremotestudio.com</a> 🎪 Join the Slack 🏁 Go to the `goals-friday` channel for the Zoom linkSee you there!<a href="https://iosdev.space/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://iosdev.space/tags/VisionPro" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#VisionPro</a> <a href="https://iosdev.space/tags/visionOS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#visionOS</a> <a href="https://iosdev.space/tags/SwiftUI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftUI</a> <a href="https://iosdev.space/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> <a href="https://iosdev.space/tags/IndieDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#IndieDev</a>

Malcolm Hall<a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> @.Model's implementation of id breaks the Identifiable protocol because it is not stable between insert and save. This means it does not work reliably with .sheet(item:) and is inefficient with List/ForEach.<a href="https://stackoverflow.com/a/79616883/259521" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://stackoverflow.com/a/79616883/259521</a>

Aleksander StojanowskiI published a hot fix update this morning, but I even forgot to post about it. But it’s live and you can download it already. 😅 I, on the other hand, have been struggling with moving <a href="https://iosdev.space/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> models to the shared framework. I can swear I worked yesterday! 😆 <a href="https://iosdev.space/tags/BuildInPublic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#BuildInPublic</a> <a href="https://iosdev.space/tags/IndieHacker" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#IndieHacker</a> <a href="https://iosdev.space/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://iosdev.space/tags/IndieDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#IndieDev</a>

Keith Harrison :clubtwit:How do you write SwiftData predicates to query for parent relationships? <a href="https://twit.social/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://twit.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> <a href="https://twit.social/tags/SwiftUI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftUI</a> <a href="https://useyourloaf.com/blog/swiftdata-predicates-for-parent-relationships/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://useyourloaf.com/blog/swiftdata-predicates-for-parent-relationships/</a>

Evan K. StoneJoin us for the Swift Developer Goals meeting today at 12:30PM PT! 🏁Sign up for the Slack access at swiftremotestudio.com and find the link to the Zoom meeting in the goals-friday channel.In addition to goal setting, we also usually chat about: <a href="https://iosdev.space/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://iosdev.space/tags/VisionPro" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#VisionPro</a> <a href="https://iosdev.space/tags/visionOS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#visionOS</a> <a href="https://iosdev.space/tags/SwiftUI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftUI</a> <a href="https://iosdev.space/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a>

Patrick McConnellI mentioned last week I would put together a blog post gathering my thoughts and process in working thru <a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> Migrations.Have at it…SwiftData Migrations and the Real World: <a href="https://pmcconnell.micro.blog/2025/04/15/swiftdata-migrations-and-the-real.html" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://pmcconnell.micro.blog/2025/04/15/swiftdata-migrations-and-the-real.html</a><a href="https://mastodon.social/tags/Swift" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Swift</a> <a href="https://mastodon.social/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://mastodon.social/tags/macOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#macOSDev</a>

Rasmus Grouleff (he/him)Heeeelp!What does the following error mean, and how do I fix it? It happens, when I call `modelContext.save()` in a SwiftUI view."SwiftData/ModelCoders.swift:105: Fatal error: Composite Coder only supports Keyed Container”Edit: Solved! It appears SwiftData does not support Duration properties in models. Changing it to a TimeInterval instead fixes it.<a href="https://mstdn.social/tags/Swift" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Swift</a> <a href="https://mstdn.social/tags/SwiftUI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftUI</a> <a href="https://mstdn.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a>

Patrick McConnellBiggest tip I can offer when working through a migration strategy, is to work on a new git branch so you can delete a bad data store, restore the old working branch and start over.You can create a rollback strategy as well but I found it just as easy to delete the bad data store, revert to working data and try again.If you don't start a migration clean and it has previously failed you may find a lot of duplicate data once it does work all the way thru. <a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> <a href="https://mastodon.social/tags/Swift" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Swift</a> <a href="https://mastodon.social/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://mastodon.social/tags/macOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#macOSDev</a>

Patrick McConnellIn my case I was migrating from a schema where a relationship was becoming many to many. I needed to gather all the current single relationships in willMigrate and then in didMigrate I had to add them to the new to many relationship.There is no relationship between willMigrate and didMigrate so you need to do some sketchy (globals) things to pass data across contexts.Once I'm comfortable I've gotten this all correct, I’ll do a blog post.<a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> <a href="https://mastodon.social/tags/Swift" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Swift</a> <a href="https://mastodon.social/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://mastodon.social/tags/macOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#macOSDev</a>

Patrick McConnellYou do not need to update any models in willMigrate if they are the same across schemas. You may only need to make changes in didMigrate, for example setting defaults for new Model values. <a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> <a href="https://mastodon.social/tags/Swift" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Swift</a> <a href="https://mastodon.social/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://mastodon.social/tags/macOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#macOSDev</a>

Patrick McConnellTIL working with <a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> migrations the past few days.The documentation is non-existent. The sample code, tutorials, etc are all copying mostly trivial examples and sadly each other.A custom migration schema has two phases each is passed a context. The first, willMigrate, will have the context for the schema you are migrating from, the second, didMigrate will have the newest context.<a href="https://developer.apple.com/documentation/swiftdata/migrationstage/custom(fromversion:toversion:willmigrate:didmigrate:)" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://developer.apple.com/documentation/swiftdata/migrationstage/custom(fromversion:toversion:willmigrate:didmigrate:)</a><a href="https://mastodon.social/tags/Swift" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Swift</a> <a href="https://mastodon.social/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://mastodon.social/tags/macOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#macOSDev</a>

Aleksander StojanowskiSorry <a href="https://mastodon.social/@mattiem" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@mattiem</a> for giving yet another example of strong behavior of ModelActor. I hope maybe you can understand why it’s behaving so strangely. 😅 <a href="https://iosdev.space/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> <a href="https://iosdev.space/tags/ModelActor" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ModelActor</a>

Swift over CoffeeS4E5: <a href="https://swiftdevs.space/@mikaelacaron" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@mikaelacaron</a> and <a href="https://mastodon.social/@twostraws" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@twostraws</a> talk networking – mostly about getting computers to talk to each other, but also, just as dauntingly, about talking to other humans at conferences too. 😱Plus: news, Apple delays, and the trifling little matter of the major changes you’re hoping to see in <a href="https://mastodon.social/tags/Xcode" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Xcode</a>, <a href="https://mastodon.social/tags/SwiftUI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftUI</a>, <a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> and more as <a href="https://mastodon.social/tags/WWDC25" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#WWDC25</a> rolls around!🎧 <a href="https://podcasts.apple.com/gb/podcast/swift-over-coffee/id1435076502?i=1000700512953" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://podcasts.apple.com/gb/podcast/swift-over-coffee/id1435076502?i=1000700512953</a>

Aleksander StojanowskiTook a deep dive into SwiftData today! 🏊‍♂️💾 Moved operations to background threads, including the heavyweight streak recalculation. Was feeling pretty proud until I noticed the “automagic” SwiftUI animations vanished! 😱 <a href="https://iosdev.space/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> <a href="https://iosdev.space/tags/iOSPerformance" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSPerformance</a>

timmitraA few months ago, I wrote a comprehensive course on SwiftData. Its just been published for Kodeco subscribers. <a href="https://mastodon.social/tags/swiftdata" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#swiftdata</a> <a href="https://www.kodeco.com/ios/paths/continuing-swiftui/45123174-data-persistence-with-swiftdata" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://www.kodeco.com/ios/paths/continuing-swiftui/45123174-data-persistence-with-swiftdata</a>

Shane Becker<a href="https://ruby.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> question—Schema: Author, hm Posts Post, hm CommentsI want to make `author.comments`Can I do queries in the Post model or only in a SwiftUI View?Can I do queries as an attribute/method for consumption by multiple callers?(Like <a href="https://ruby.social/tags/Rails" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Rails</a>' `scope` or has_many_through)

Patrick McConnellRefactored a gnarly bundle of code to make it correct for <a href="https://mastodon.social/tags/Swift" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Swift</a> Concurrency.I have a better handle on it all now but I still see a few areas it needs to improvePassing results from async to the main thread is far too difficult requiring a lot of scaffolding to allow: self.stuff = asyncStuff<a href="https://mastodon.social/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> needs to work better with async/await. One side of the other needs to improve.In general, it's just too much thinking, tweaking and adorning your code with magic keywords and types<a href="https://mastodon.social/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a>

Kern Jackson :xcode:My main gripe with SwiftData is having to import SwiftData into virtually all of my views. Is that just how it is, or am I holding it wrong?<a href="https://iosdev.space/tags/iOSDev" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#iOSDev</a> <a href="https://iosdev.space/tags/SwiftUI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftUI</a> <a href="https://iosdev.space/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a>

Aleksander StojanowskiNow back to my strange errors - I kinda did it to myself. 🙈 As a workaround, for I don’t remember what exactly, I decided to manually save <a href="https://iosdev.space/tags/SwiftData" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftData</a> context after each change to models. For some reason, I don’t understand, that causes problems with the <a href="https://iosdev.space/tags/SwiftUI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SwiftUI</a> update process.

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