For some reason when I add an @Query macro to my child view it fails to render. If I simplify my child view by just adding a plain text field while still leaving the @Query macro it still won’t render. However, if I comment out the @Query macro in the child view then it renders, why?

I have been scratching my head trying to figure that out. I’d love to be able to use the album’s id that is being passed from the parent view in the child view to filter the @Query for the media, but I haven’t been able to figure out how to do that either since I can’t view my child view if it uses the @Query macro. I feel like it may be stuck in a loop or something. FYI, I only have about 30 rows of media in the database so it isn’t large or anything. Also, if I add logging to the child view using the .onAppear modifier it does output logs even though the view isn’t shown.

Here are my SwiftData models:

import SwiftUI
import SwiftData

@Model
class Album: Identifiable {
    var id: UUID = UUID()
    var isPublicAlbum: Bool = false
    var title: String = ""
    var timeStamp: Date = Date()
    
    @Relationship(deleteRule: .cascade, inverse: Media.album) var media: [Media]?
    
    init(isPublicAlbum: Bool, title: String, timeStamp: Date = Date()) {
        self.isPublicAlbum = isPublicAlbum
        self.title = title
        self.timeStamp = timeStamp
    }
}

import SwiftUI
import SwiftData

@Model
class Media: Identifiable {
    var id: UUID = UUID()
    var albumID: UUID = UUID()
    @Attribute(.externalStorage) var asset: Data? = nil
    var isCover: Bool = false
    var contentType: String = ""
    var timeStamp: Date = Date()
    //var album: Album?
    
    @Relationship(deleteRule: .nullify) var album: Album?
    
    init(albumID: UUID = UUID(), asset: Data? = nil, isCover: Bool = false, contentType: String = "", timeStamp: Date = Date()) {
        self.albumID = albumID
        self.asset = asset
        self.isCover = isCover
        self.contentType = contentType
        self.timeStamp = timeStamp
    }
}

Here is my model container:

import SwiftData

class ModelContainerManager {
    static let shared = ModelContainerManager()
    let container: ModelContainer

    private init() {
        do {
            container = try ModelContainer(for: User.self, Album.self, Media.self)
        } catch {
            fatalError(error.localizedDescription)
        }
    }
}

I pass my container to all my views like so:

ContentView(……)
    .modelContainer(ModelContainerManager.shared.container)

Here is the relevant code for my parent view:

struct MainView: View {
    @Environment(.modelContext) private var dbContext
    @Environment(.horizontalSizeClass) var horizontalSizeClass
    @Environment(.colorScheme) var colorScheme
    @Query(filter: #Predicate<Album> { $0.isPublicAlbum == false }, sort: Album.title, order: .forward) private var listAlbums: [Album]
    @State private var searchString: String = ""
    
    private var filteredAlbums: [Album] {
        if searchString.isEmpty {
            return listAlbums
        } else {
            return listAlbums.filter { album in
                album.title.localizedStandardContains(searchString)
            }
        }
    }

    //...

    var body: some View {
        VStack {
            CustomSearchBar(text: $searchString, placeholder: NSLocalizedString("Search Private Albums", comment: "This is a search bar to search for private albums"))
            //...
            ForEach(filteredAlbums) { album in
                VStack(spacing: 0) {
                    ZStack(alignment: .topTrailing) {
                        NavigationLink(destination: PersistentAlbumView(album: album)) {
                            //...
                        }
                    } 
                }
            }
            //...
        }
    }
}

Here is my child view:

import SwiftUI
import SwiftData

struct PersistentAlbumView: View {
    @Environment(.modelContext) private var dbContext
    @Query private var mediaItems: [Media]
    let album: Album
    
    var body: some View {
        VStack {
            if !mediaItems.isEmpty {
                List(mediaItems) { item in
                    if item.albumID == album.id {
                        Text("Media ID: (item.id.uuidString)")
                    }
                }
            } else {
                Text("No media found")
            }
        }
    }
}

#Preview {
    NavigationStack {
        PersistentAlbumView(album: PreviewContainer.getAlbum(at: 3))
            .modelContainer(PreviewContainer.container)
            .navigationBarTitleDisplayMode(.inline)
    }
}

I have tested the following simplified view by using it outside of the parent view just to make sure the media query does work, and it does:

import SwiftUI
import SwiftData

struct MediaListView: View {
    @Query private var mediaItems: [Media]
    
    var body: some View {
        List(mediaItems, id: .id) { media in
            Text(media.id.uuidString)
        }
    }
}

#Preview {
    MediaListView()
        .modelContainer(PreviewContainer.container)
}

If anyone can tell me what in the world I’m doing wrong that would be awesome!

P.S. I don’t want to use album.media since it is a relation and is treated like a computed property. When using album.media, the view doesn’t show updates in real-time when the app is reinstalled and new data has been synced with my Media model. So using the relationship is not an option for me.

Any help on fixing the @Query macro in my child view to use it on my Media model would be awesome! I usually can figure out stuff like this but I’m not used to working with SwiftData. Thanks in advance!