Questions tagged [swiftdata]
SwiftData is a Swift-based Apple framework for managed persistence. It combines CoreData persistence technology with Swift’s modern concurrency features.
swiftdata
568
questions
22
votes
1
answer
3k
views
SwiftData - How to observe changes to the database outside of SwiftUI?
I have a simple example. I fetch all Trip objects from my database:
import SwiftData
@Model
class Trip {
var name: String
}
func fetch() {
let container = ModelContainer(for: Trip.self)
...
- 4,131
19
votes
3
answers
6k
views
How to persist custom enum with SwiftData?
I want to save a custom enum to my SwiftData model. I can get it to work that it shows and even updates the value in the UI. Though, the change of the enum var/entity isn’t persisted when relaunching ...
- 2,616
17
votes
3
answers
6k
views
SwiftData list bindings with @Query
Since Swift 5.5 we could create SwiftUI lists with bindings like this (e.g. see this answer):
class Item {
// ...
var isOn: Bool
}
struct ContentView: View {
@State private var items: [...
- 8,166
16
votes
8
answers
8k
views
How to resolve SwiftData error "Type '*' does not conform to protocol 'PersistentModel'"
Working through the betas of SwiftData and trying to stand up a PersistentContainer. I set up a modelContainer View modifier on my ContentView and conformed my class to @Model as described in various ...
- 659
16
votes
2
answers
2k
views
Crash when accessing relationship property of SwiftData model
I have two one-to-many models and I'm getting an unexplained crash when trying to access the relationship properties of the models.
The reason for the error is as follows:
Thread 1: EXC_BREAKPOINT (...
- 253
16
votes
6
answers
3k
views
SwiftData IOS 17 Array in random order?
Why is the order of my array random when i use the @Model macro.
class TestModel {
var name: String?
var array: \[TestModel2\]
init(name: String = "") {
self.name = name
...
- 161
15
votes
2
answers
6k
views
SwiftData @Query with #Predicate on Relationship Model
XCode 15 beta 6.
Just want to do a very simple Query Predicate where the relationship model matches:
@Query(
filter: #Predicate<Piece> {
$0.artist == selectedArtist
},
sort: [...
- 14k
15
votes
4
answers
9k
views
SwiftData query with dynamic properties in a View
I'm trying to figure out how to make a SwiftUI view that displays data from SwiftData using a query that includes variables passed into the view. I'm guessing that I won't be able to use the @Query ...
- 790
14
votes
2
answers
2k
views
How can we use custom structs/enums with the Model and Predicate macros?
Swift 5.9 and the new SwiftData framework introduce the @Model and #Predicate macros. We can now use custom enums and structs in our our models, like so:
@Model
final class Item {
var name: Name
...
- 862
12
votes
1
answer
4k
views
Using SwiftData outside of SwiftUI
I want to create a class for handling some data at regular intervals. I've not used CoreData. Outside of a SwiftUI view, how do I get the model container and context so I can retrieve and add objects? ...
- 6,351
12
votes
1
answer
533
views
Crash when sorting SwiftData Query with a SortDescriptor made from a KeyPath with an optional relationship in the chain
I have the following models:
@Model
class Game {
var name: String
var firstReleasedOn: Date?
@Relationship(deleteRule: .cascade, inverse: \QueueEntry.game)
var queueEntry: QueueEntry?
...
- 123
12
votes
0
answers
723
views
Sharing SwiftData with iCloud users
has anyone figured out how to use swiftdata in SwiftUI with CloudKit to share data among other users and set permissions? Thank you!
I checked apple’s documentation along with the internet in general. ...
9
votes
3
answers
3k
views
Combining Predicate in SwiftData
I'm trying to combine multiple Predicates of the Type with and / or.
Previously with CoreData and NSPredicate I'd just do this:
let predicate = NSPredicate(value: true)
let predicate2 = NSPredicate(...
- 3,319
9
votes
2
answers
3k
views
SwiftData passing @Model objects as parameters in SwiftUI
I am trying to work with multiple views in a SwiftData based SwiftUI project. However, when I create a parameter for a SwiftData @Model object in another view, when I create a sample of that object in ...
- 123
9
votes
1
answer
1k
views
How to fetch with new #Predicate macro by Enum property
I'm trying to fetch some results with the new #Predicate macro. The problem appears when I try to use an enum property inside the predicate. Does anyone know if it can be done or if this is a bug?
...
- 129