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SOLVED: Something wrong with SwiftData

Forums > Swift
@omeriadon  

I have made the following code to basically play around with haptics:

LibraryView.swift

import SwiftUI
import SwiftData

struct LibraryView: View {

    @Environment(\.modelContext) var modelContext
    @Query/*(sort: \CustomHaptic.dateMade)*/ var customHapticArray: [CustomHaptic]
    @Query/*(sort: \DefaultHaptic.dateMade)*/ var defaultHapticArray: [DefaultHaptic]

    @State private var showingAddCustomHaptic = false
    @State private var showingAddDefaultHaptic = false

    var body: some View {
        NavigationStack {
            VStack {
                List {
                    ForEach(customHapticArray) { customHaptic in
                        HStack {
                            VStack {
                                Text("\(customHaptic.sharpness)")
                                Text("")
                                Text("\(customHaptic.intensity)")
                            }

                            Spacer()

                            VStack {
                                Text("\(customHaptic.repeats)")
                            }
                        }
                    }
                }
            }
            .sheet(isPresented: $showingAddCustomHaptic, content: {
                NewCustomHaptic()
            })
            .toolbar {
                Button("New Custom Haptic", systemImage: "plus") {

                    showingAddCustomHaptic = true
                }
            }
            .navigationTitle("Haptikiser")
        }
    }
}

And NewCustomHaptic.swift, which is a sheet to add a new class CustomHaptic:

@Model
class CustomHaptic: Identifiable {

    var id = UUID()

    var dateMade = Date.now

    var repeats: Int

    var sharpness: Float
    var intensity: Float

    init(repeats: Int, sharpness: Float, intensity: Float) {
        self.repeats = repeats
        self.sharpness = sharpness
        self.intensity = intensity
    }
}

and

import SwiftUI
import SwiftData

struct NewCustomHaptic: View {

    @Environment(\.dismiss) var dismiss

    @Environment(\.modelContext) var modelContext
    @Query(sort: \CustomHaptic.dateMade) var customHapticArray: [CustomHaptic]

    @State var sharpness: Float = 1
    @State var intensity: Float = 1
    @State var repeats: Int = 3

    let array0to1: [Float] = [0.2, 0.4, 0.6, 0.8, 1.0]

    var body: some View {
        VStack {
            Form {
                Section("Sharpness") {
                    Picker(selection: $sharpness, label: Label("Sharpness", systemImage: "bolt.horizontal")) {
                        ForEach(array0to1, id: \.self) { i in
                            Text("\(Int(i * 10))")

                        }

                    }

                    .pickerStyle(.segmented)

                }

                Section("Intensity") {
                    Picker(selection: $intensity, label: Label("Intensity", systemImage: "42.circle")) {
                        ForEach(array0to1, id: \.self) { i in
                            Text("\(Int(i * 10))")

                        }

                    }
                    .pickerStyle(.segmented)

                }

                Section("Repeats") {
                    Stepper(value: $repeats, in: 1...10) {
                        Label("\(repeats)", systemImage: "repeat")
                    }
                }
            }

            Button("Done") {

                let newCustomHaptic = CustomHaptic(repeats: repeats, sharpness: sharpness, intensity: intensity)
                modelContext.insert(newCustomHaptic)

                dismiss()
            }
            .buttonStyle(.borderedProminent)
            .font(.title)

            Spacer()
        }

    }
}

every single time i run it, i get " Query encountered an error: Error Domain=NSCocoaErrorDomain Code=256 "The file “default.store” couldn’t be opened." " in the console.

And when I press done on the sheet, i get the same error.

Thank you for helping

1      

@ErinJulius  HWS+

The issue appears to lay in the Query for DefaultHaptic: 

  @Query/*(sort: \DefaultHaptic.dateMade)*/ var defaultHapticArray: [DefaultHaptic]

you didn't provide code for this model so when trying to recreate your issue I temporarily disabled it.

With it disabled, and with the content view as shown below, I was unable to recreate the issue you've identified in a simulator. 

import SwiftUI
import SwiftData

struct ContentView: View {
    var body: some View {
        LibraryView()
    }
}

If you share the additional model details I'm happy to try and reproduce it again.

Hope this at least gives you some direction in the meantime.

2      

@omeriadon  

It's just a normal SwiftData as far as i know:

WindowGroup {

            TabView {
                LibraryView()
                    .tabItem {
                        Label("Library", image: "custom.waveform.rectangle.stack")
                    }
                ContentView()
                    .tabItem {
                        Label("Default", image: "custom.waveform.badge.ellipsis")
                    }
                CustomHapticView()
                    .tabItem {
                        Label("Custom", image: "custom.waveform.badge.gearshape.fill")
                    }

            }

        }
        .modelContainer(for: CustomHaptic.self)
        .modelContainer(for: DefaultHaptic.self)

1      

@omeriadon  

I also changed a few things:

NewCustomHaptic.swift

import SwiftUI
import SwiftData

struct NewCustomHaptic: View {

    @Environment(\.dismiss) var dismiss

    @Environment(\.modelContext) var modelContext
    @Query(sort: \CustomHaptic.dateMade) var customHapticArray: [CustomHaptic]

    @Binding var tempCustomHaptic: CustomHaptic

    @State var sharpness: Float = 1
    @State var intensity: Float = 1
    @State var repeats: Int = 3

    let array0to1: [Float] = [0.2, 0.4, 0.6, 0.8, 1.0]

    var body: some View {
        VStack {
            Form {
                Section("Sharpness") {
                    Picker(selection: $sharpness, label: Label("Sharpness", systemImage: "bolt.horizontal")) {
                        ForEach(array0to1, id: \.self) { i in
                            Text("\(Int(i * 10))")

                        }

                    }

                    .pickerStyle(.segmented)

                }

                Section("Intensity") {
                    Picker(selection: $intensity, label: Label("Intensity", systemImage: "42.circle")) {
                        ForEach(array0to1, id: \.self) { i in
                            Text("\(Int(i * 10))")

                        }

                    }
                    .pickerStyle(.segmented)

                }

                Section("Repeats") {
                    Stepper(value: $repeats, in: 1...10) {
                        Label("\(repeats)", systemImage: "repeat")
                    }
                }
            }

            Button("Done") {

                let newCustomHaptic = CustomHaptic(repeats: repeats, sharpness: sharpness, intensity: intensity)
                modelContext.insert(newCustomHaptic)

                dismiss()
            }
            .buttonStyle(.borderedProminent)
            .font(.title)

            Spacer()
        }

    }
}

and

LibraryView.swift

import SwiftUI
import SwiftData

struct LibraryView: View {

    @Environment(\.modelContext) var modelContext
    @Query(sort: \CustomHaptic.dateMade) var customHapticArray: [CustomHaptic]
    @Query(sort: \DefaultHaptic.dateMade) var defaultHapticArray: [DefaultHaptic]

    @State private var showingAddCustomHaptic = false
    @State private var showingAddDefaultHaptic = false

    @State var temporaryCustomHaptic = CustomHaptic(repeats: 3, sharpness: 0.4, intensity: 0.6)

    var body: some View {
        NavigationStack {
            VStack {
                List {
                    ForEach(customHapticArray, id: \.id) { customHaptic in
                        HStack {
                            VStack {
                                Text("\(customHaptic.sharpness)")
                                Text("")
                                Text("\(customHaptic.intensity)")
                            }

                            Spacer()

                            VStack {
                                Text("\(customHaptic.repeats)")
                            }
                        }
                    }
                }
            }
            .sheet(isPresented: $showingAddCustomHaptic, content: {
                NewCustomHaptic(tempCustomHaptic: $temporaryCustomHaptic)

            })
            .toolbar {
                Button("New Custom Haptic", systemImage: "plus") {

                    showingAddCustomHaptic = true

                    modelContext.insert(temporaryCustomHaptic)

                    temporaryCustomHaptic = CustomHaptic(repeats: 3, sharpness: 0.4, intensity: 0.6)
                }
            }
            .navigationTitle("Haptikiser")
        }
    }
}

I basically changed logic to make a new variable of the class, pass it in as a @Binding, then take it back and insert that in to the model.

However upon running on a real iPhone, the console said "SwiftData/ModelContainer.swift:144: Fatal error: failed to find a currently active container for CustomHaptic"

This issue seems fixable.

Apart from this, are there any better ways to use SwiftData?

1      

@ErinJulius  HWS+

your new issue is likely from the code in your tab view here: 

 .modelContainer(for: CustomHaptic.self)
        .modelContainer(for: DefaultHaptic.self)

the items should go together in a single instance of modelcontainer 

     .modelContainer(for: [CustomHaptic.self, DefaultHaptic.self])

also if you've made any changes to your data model in between running your build on device (simulator or real) it can cause a similar crash.

To avoid it you can use versioning or alternatively delete the app, and therefore any conflicting data, from the device.

2      

@omeriadon  

Oh wow thank you so much

i literally spent three hours trying to see what was wrong and this was it? i would never have thought that.

Thank you

1      

@ErinJulius  HWS+

happy to hear it worked!

I'm new to swift/coding in general so I've done similar and spent hours troubleshooting only to discover a hidden error in one line of seemingly inconsequential code. Done it a lot of this while learning SwiftData these past few months 😅

Happy coding!

1      

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