I am using SwiftData in a SwiftUI view called DeckView and I'm adding a AddDeck function but let deck = Deck() is returning 'Missing argument for parameter 'backingData' in call' Here is the full code:
DeckView
import SwiftUI
import SwiftData
struct DeckView: View {
@State private var showingSheet = false
@Environment(\.modelContext) var modelContext
@Query var decks: [Deck]
@State private var path = [Deck]()
var body: some View {
NavigationStack(path: $path) {
ZStack {
Color.background
.ignoresSafeArea()
List {
ForEach(decks) { deck in
NavigationLink(value: deck) {
HStack {
VStack(alignment: .leading) {
Text(deck.name)
HStack {
Image(systemName: "square.3.layers.3d.top.filled")
Text(deck.cards)
}
.padding(.top)
}
}
}
}
.onDelete(perform: deleteDeck)
.listRowBackground(Color(.secondaryC))
}
.scrollContentBackground(.hidden)
}
.foregroundColor(Color(.text))
.navigationTitle("Decks")
.navigationDestination(for: Deck.self, destination: EditDeckView.init)
.toolbar {
ToolbarItem(placement: .topBarTrailing) {
Image(systemName: "plus")
.onTapGesture {
showingSheet.toggle()
addSamples()
}
}
}
.sheet(isPresented: $showingSheet) {
CreateDeckSheet()
}
}
}
func addSamples() {
let swiftd = Deck(name: "SwiftData", cards: "20")
let swifty = Deck(name: "Swift", cards: "21")
let swiftyui = Deck(name: "SwiftUI", cards: "32")
modelContext.insert(swiftd)
modelContext.insert(swifty)
modelContext.insert(swiftyui)
}
func addDeck() {
let deck = Deck()
modelContext.insert(deck)
path = [deck]
}
func deleteDeck(_ indexSet: IndexSet) {
for index in indexSet {
let deck = decks[index]
modelContext.delete(deck)
}
}
}
#Preview {
DeckView()
}
Data Model
import Foundation
import SwiftData
@Model
class Deck {
var name: String
var cards: String
init(name: String, cards: String) {
self.name = name
self.cards = cards
}
}
Jt10594
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I was using swift data on my project in what I thought was a not very complex data model and then after I added the delete function it gave me this error and crashed the simulator every time.
DataModel
import Foundation
import SwiftData
@Model
class Deck {
var name: String
var cards: String
init(name: String, cards: String) {
self.name = name
self.cards = cards
}
}
And this is where I was fetching the data.
DeckView
import SwiftUI
import SwiftData
struct DeckView: View {
@State private var showingSheet = false
@Environment(\.modelContext) var modelContext
@Query var decks: [Deck]
var body: some View {
NavigationStack {
ZStack {
Color.background
.ignoresSafeArea()
List {
ForEach(decks) { deck in
HStack {
VStack(alignment: .leading) {
Text(deck.name)
Text(deck.cards)
}
Spacer()
Button {
// Action
} label: {
Image(systemName: "ellipsis.circle")
}
}
}
.onDelete(perform: deleteDeck)
}
.scrollContentBackground(.hidden)
}
.navigationTitle("Decks")
.navigationBarTitleDisplayMode(.automatic)
.toolbar {
ToolbarItem(placement: .topBarTrailing) {
Image(systemName: "plus")
.onTapGesture {
// showingSheet.toggle()
addSamples()
}
}
}
.sheet(isPresented: $showingSheet) {
NewDeckSheet()
}
}
}
func addSamples() {
let swiftd = Deck(name: "SwiftData", cards: "20")
let swifty = Deck(name: "Swift", cards: "21")
let swiftyui = Deck(name: "SwiftUI", cards: "32")
modelContext.insert(swiftd)
modelContext.insert(swifty)
modelContext.insert(swiftyui)
}
func deleteDeck(_ indexSet: IndexSet) {
for index in indexSet {
let deck = decks[index]
modelContext.delete(deck)
}
}
}
What the console returns
Deck = "(<NSEntityDescription: 0x600002c88790>) name Deck, managedObjectClassName NSManagedObject, renamingIdentifier Deck, isAbstract 0, superentity name (null), properties {\n cards = \"(<NSAttributeDescription: 0x6000035a9080>), name cards, isOptional 0, isTransient 0, entity Deck, renamingIdentifier cards, validation predicates (\\n), warnings (\\n), versionHashModifier (null)\\n userInfo {\\n}, attributeType 300 , attributeValueClassName NSNumber, defaultValue (null), preservesValueInHistoryOnDeletion NO, allowsCloudEncryption NO\";\n name = \"(<NSAttributeDescription: 0x6000035a9100>), name name, isOptional 0, isTransient 0, entity Deck, renamingIdentifier name, validation predicates (\\n), warnings (\\n), versionHashModifier (null)\\n userInfo {\\n}, attributeType 700 , attributeValueClassName NSString, defaultValue (null), preservesValueInHistoryOnDeletion NO, allowsCloudEncryption NO\";\n}, subentities {\n}, userInfo {\n}, versionHashModifier (null), uniquenessConstraints (\n)";
}, fetch request templates {
}, destinationModel=(<NSManagedObjectModel: 0x6000038a69e0>) isEditable 0, entities {
Deck = "(<NSEntityDescription: 0x600002c84420>) name Deck, managedObjectClassName Deck, renamingIdentifier Deck, isAbstract 0, superentity name (null), properties {\n cards = \"(<NSAttributeDescription: 0x60000359f680>), name cards, isOptional 0, isTransient 0, entity Deck, renamingIdentifier cards, validation predicates (\\n), warnings (\\n), versionHashModifier (null)\\n userInfo {\\n}, attributeType 700 , attributeValueClassName NSString, defaultValue (null), preservesValueInHistoryOnDeletion NO, allowsCloudEncryption NO\";\n name = \"(<NSAttributeDescription: 0x60000359f580>), name name, isOptional 0, isTransient 0, entity Deck, renamingIdentifier name, validation predicates (\\n), warnings (\\n), versionHashModifier (null)\\n userInfo {\\n}, attributeType 700 , attributeValueClassName NSString, defaultValue (null), preservesValueInHistoryOnDeletion NO, allowsCloudEncryption NO\";\n}, subentities {\n}, userInfo {\n}, versionHashModifier (null), uniquenessConstraints (\n)";
}, fetch request templates {
}, reason=Can't find or automatically infer mapping model for migration, NSUnderlyingError=0x60000156cb70 {Error Domain=NSCocoaErrorDomain Code=134190 "(null)" UserInfo={entity=Deck, property=cards, reason=Source and destination attribute types are incompatible}}}
And then: SwiftData/ModelContainer.swift:144: Fatal error: failed to find a currently active container for Deck
And: Failed to find any currently loaded container for Deck)
Any help would be appreciated, thank you!
Hello, I'm a little new to Swift and very new to SwiftData. I'm making a flashcard app in which the decks of flashcards are displayed in a view. I've created a reusable component for the decks in which I want to use SwiftData to store the Title date of creation and eventually number of cards. So far I'm just trying to get the title. Here is the component:
Deck Component
import SwiftUI
import SwiftData
struct DeckRow: View {
@State private var isPressed = false
@State private var isToggled = false
@Environment(\.modelContext) var modelContext
@Query var decks: [Deck]
var body: some View {
ZStack {
RoundedRectangle(cornerRadius: 20)
.frame(height: 99)
.padding(.horizontal)
.foregroundStyle(Color.primaryC)
.offset(y: 8)
HStack(alignment: .top) {
VStack(alignment: .leading, spacing: 20) {
HStack {
Text(decks.name)
.font(.title2)
.bold()
Text("2w")
.font(.subheadline)
.fontWeight(.light)
}
HStack {
Image(systemName: "square.3.layers.3d.top.filled")
Text("20 Cards")
}
}
Spacer()
Button {
} label: {
Image(systemName: "ellipsis.circle")
.font(.title3)
.bold()
}
}
.padding()
.foregroundStyle(Color.text)
.background(Color.secondaryC)
.cornerRadius(15)
.padding()
.offset(y: isPressed ? 8 : 0)
.gesture(
DragGesture(minimumDistance: 0)
.onChanged { _ in
withAnimation(.linear(duration: 0.5)) {
isToggled.toggle()
}
isPressed = true
}
.onEnded { _ in
withAnimation(.easeInOut) {
isPressed = false
}
}
)
}
}
}
But, Text(decks.name) keeps returningValue of type '[Deck]' has no member 'name' even though it does. Here is the data model:
Data Model
import Foundation
import SwiftData
@Model
class Deck {
var name: String
var cards: Int
var creationDate: Date
init(name: String = "", cards: Int = 0, creationData: Date = Date()) {
self.name = name
self.cards = cards
self.creationDate = creationData
}
}
Any help or tips would be greatly appreciated. Thank you!
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