Are you allowed to save to the managed object context (Core Data) while typing in a TextEditor (Text Field Input)? - core-data

Question

The question is best explained in an example:
struct MyEditor: View {
#Environment(\.managedObjectContext) var managedObjectContext
#ObservedObject var song: Song
var body: some View {
TextEditor(text: $song.lyrics)
.navigationTitle(song.title)
.onChange(of: song.lyrics) { newValue in
try? managedObjectContext.save()
}
}
}
It feels wrong to spam save but I want to make sure the data is stored. Is this allowed and a correct way to do it?
Another way I can think of is to create a publisher that smoothens the signal to save. If this is the correct way to do it. Can I retrieve the publisher from the ObservedObject or do I have to create a different #State property for that and use onChange to pass the values.
struct MyEditor: View {
#Environment(\.managedObjectContext) var managedObjectContext
#ObservedObject var song: Song
#State private var lyricsPublisher = PassthroughSubject<String, Never>()
var body: some View {
TextEditor(text: $song.lyrics)
.navigationTitle(song.title)
.onChange(of: song.lyrics) { newValue in
lyricsPublisher.send(newValue)
}
.onReceive(lyricsPublisher
.debounce(for: 0.5, scheduler: RunLoop.main)
.removeDuplicates()
) { value in
try? managedObjectContext.save()
}
}
}
This is what Song looks like as a ManagedObject.
#objc(Song)
class Song: NSManagedObject, Identifiable {
#nonobjc class func fetchRequest() -> NSFetchRequest<Song> {
return NSFetchRequest<Scribble>(entityName: "Song")
}
#NSManaged public var id: UUID
#NSManaged public var title: String
#NSManaged public var lyrics: String
}

Answer 1

Yes, it is possible to use publisher of managed object (ObservedObject) directly, like
var body: some View {
TextEditor(text: $song.lyrics)
.navigationTitle(song.title)
.onReceive(song.publisher(for: \.lyrics) // << here !!
.debounce(for: 0.5, scheduler: DispatchQueue.main)
.removeDuplicates()
) { value in
try? managedObjectContext.save()
}
}

Answer 2

Credits to #lorem_ipsum and #Asperi.
I combined their solutions into one.
struct MyEditor: View {
#Environment(\.managedObjectContext) var managedObjectContext
#ObservedObject var song: Song
var body: some View {
TextEditor(text: $song.lyrics)
.navigationTitle(song.name)
.onReceive(song.publisher(for: \.lyrics)
.debounce(for: 0.5, scheduler: RunLoop.main)
.removeDuplicates()
) { _ in
if song.hasChanges {
try? managedObjectContext.save()
}
}
}
}