relationshipKeyPathsForPrefetching in SwiftData does not seem to work here when scrolling down the list. Why?
I would like all categories to be fetched while posts are fetched - not while scrolling down the list.
struct ContentView: View {
var body: some View {
QueryList(
fetchDescriptor: withCategoriesFetchDescriptor
)
}
var withCategoriesFetchDescriptor: FetchDescriptor<Post> {
var fetchDescriptor = FetchDescriptor<Post>()
fetchDescriptor.relationshipKeyPathsForPrefetching = [\.category]
return fetchDescriptor
}
}
struct QueryList: View {
@Query
var posts: [Post]
init(fetchDescriptor: FetchDescriptor<Post>) {
_posts = Query(fetchDescriptor)
}
var body: some View {
List(posts) { post in
VStack {
Text(post.title)
Text(post.category?.name ?? "")
.font(.footnote)
}
}
}
}
@Model
final class Post {
var title: String
var category: Category?
init(title: String) {
self.title = title
}
}
@Model final class Category {
var name: String
init(name: String) {
self.name = name
}
}
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