Entity間でのrelation

AView → BView → CView

と遷移して、

AからCにfolderを渡しているのですが、

swift
1
2func saveLink() {
3item.folder = folder
4try? viewContext.save()
5}
6

として、Bで[Item]が表示されません。

inverse はfolder、itemなのですが、

これではちがうのでしょうか？

また、addToFolder()というものも調べたのですが、これらは別ものでしょうか？

追記

swift
1
2struct AView: View {
3    @FetchRequest(
4        sortDescriptors: [NSSortDescriptor(keyPath: \Item.nowDate, ascending: true)],
5        animation: .default)
6    private var items: FetchedResults<Item>
7    @FetchRequest(sortDescriptors: [NSSortDescriptor(keyPath: \ Folder.folderMadeTime, ascending: true)], animation: .default) private var  folders: FetchedResults<Folder>
8    @Environment(\.dismiss) var dismiss
9    
10    var body: some View {
11            NavigationStack {
12                List {
13                    Section(header: Text("Sections")) {
14                        
15                        ForEach(folders) { folder in NavigationLink(destination: BView(item: item, folder: folder), label: {Text(folder.folderName ?? "a")})
16                        }
17}
18}
19

swift
1
2struct BView: View {
3    @FetchRequest(sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)], animation: .default) private var items: FetchedResults<Item>
4    var item: Item
5    var folder: Folder
6
7var body: some View {
8
9NavigationView {
10List{
11Section(header: Text("テキスト")){
12ForEach(folderItems){folderItem in
13    NavigationLink(destination: CView(item: item, folder: folder), label: {Text(folderItem.text ?? "a")})
14}
15}
16
17    private var folderItems: [Item] {
18        if let folderItems = folder.item?.allObjects as? [Item] {
19            return folderItems
20        }
21    }
22
23}
24

swift
1
2struct CView: View {
3    @Environment(\.managedObjectContext) private var viewContext
4    
5    var item: Item
6    var folder: Folder
7    
8    var body: some View {
9        
10        ZStack {
11        NavigationStack{
12            GeometryReader { geometryProxy in
13                        VStack {
14                            ZStack{
15                        
16                            let size = geometryProxy.size
17                            TextEditor(text: $textEditorText).textInputAutocapitalization(.never)
18                                .background(profile.bcolor)
19                                .opacity(0.99)
20                                .foregroundColor(profile.tcolor)
21                                .frame(width: size.width, height: size.height)
22                                .scrollContentBackground(.hidden)
23                            
24                        } 
25}
26
27}
28
29}
30
31}
32
33.onDisappear(perform: {saveLink(folder: folder)})
34
35}
36
37    func saveLink(folder: Folder) {
38        let newItem = Item(context: viewContext)
39        if textEditorText != "" {
40            newItem.text = textEditorText
41
42            newItem.folder = folder
43            try? viewContext.save()
44        }
45    }
46
47}
48

です

添削したので、抜粋です

行動規範の内容に同意します

回答1件

として、Bで[Item]が表示されません。

とのことですが、
なにがAで、どれがBで、どういうものがCなんでしょうか。
説明不足すぎて意味不明です

投稿2023/11/15 12:27

y_waiwai

総合スコア88136

hanaxjqn

2023/11/16 05:40

struct AView: View { @FetchRequest( sortDescriptors: [NSSortDescriptor(keyPath: \Item.nowDate, ascending: true)], animation: .default) private var items: FetchedResults<Item> @FetchRequest(sortDescriptors: [NSSortDescriptor(keyPath: \ Folder.folderMadeTime, ascending: true)], animation: .default) private var folders: FetchedResults<Folder> @Environment(\.dismiss) var dismiss var body: some View { NavigationStack { List { Section(header: Text("Sections")) { ForEach(folders) { folder in NavigationLink(destination: BView(item: item, folder: folder), label: {Text(folder.folderName ?? "a")}) } } } struct BView: View { @FetchRequest(sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)], animation: .default) private var items: FetchedResults<Item> var item: Item var folder: Folder var body: some View { NavigationView { List{ Section(header: Text("テキスト")){ ForEach(folderItems){folderItem in NavigationLink(destination: CView(item: item, folder: folder), label: {Text(folderItem.text ?? "a")}) } } private var folderItems: [Item] { if let folderItems = folder.item?.allObjects as? [Item] { return folderItems } } } struct CView: View { @Environment(\.managedObjectContext) private var viewContext var item: Item var folder: Folder var body: some View { ZStack { NavigationStack{ GeometryReader { geometryProxy in VStack { ZStack{ let size = geometryProxy.size TextEditor(text: $textEditorText).textInputAutocapitalization(.never) .background(profile.bcolor) .opacity(0.99) .foregroundColor(profile.tcolor) .frame(width: size.width, height: size.height) .scrollContentBackground(.hidden) } } } } } .onDisappear(perform: {saveLink(folder: folder)}) } func saveLink(folder: Folder) { let newItem = Item(context: viewContext) if textEditorText != "" { newItem.text = textEditorText newItem.folder = folder try? viewContext.save() } } } です添削したので、抜粋です