小贝子编程

在核心数据中保存一对多关系，但是在关闭模拟器之后，该关系中只有一个项目.控制台Swift中的故障



我正在加载一对一的关系（以及我的应用程序初始负载的其他测试数据中的其他测试数据）侧面是一个与多一到许多框架关系的实体：

let sideA = addNewSideToNSManagedObjectContext(orderInFlashcard: 0.0, frames: [frontFrame,backFrame], cardType: newCardType)
        let sideB = addNewSideToNSManagedObjectContext(orderInFlashcard: 1.0, frames: [backFrame,frontFrame], cardType: newCardType)
//context is saved after code above

初始数据加载后，我提出了一个tableViewController，在其中单击一行以显示已加载的数据（基本上我显示了flashcard的side1.frames，然后显示flashcard的side2.frames）当我在初始数据加载所有功能之后进行此操作时，side1.frames有2个项目和侧面。

问题：当我关闭模拟器并重新运行它时（第一次运行后，数据已经存在并且不再加载），当我单击以显示flashcard时，side1.frames有2个项目，但是side2.frames是emtpy和我得到了空白的显示。我真的很想知道问题是什么，因为所有其他数据都持续存在。

根据我显示的当前抽认卡访问了带有问题的数据：

flashcard.cardType.sides
each side.frame (for subviews)

当我提出侧面/帧时，这是检索显示数据的代码：

func setupFramesForSides(){
        //var framesForSides:[[Frame]] = [[Frame]]() //property //goal to get array order by side.orderInFlashcard of arrays of frames for each side ordered by order in each side
        var sides:[Side] = (flashcard!.cardType!.sides!.allObjects as! [Side])
        sides.sort(by:{$0.orderInFlashcard<$1.orderInFlashcard}) //sides sorted by orderInFlashcard
        currentSideIndex = 0
        print("sides count:(sides.count)")
        for s in 0..<sides.count{
            print("side:(sides[s].orderInFlashcard)")
        }
        for sideIndex in 0..<sides.count{
            let side:Side = sides[sideIndex]
            print("currentSideIndex: (sideIndex)")
            print("currentSide: (side)")
            //create sorted array of frames for the side
            let frames:[Frame] = side.frames!.allObjects as! [Frame]
            print("framesAvailable:(frames)")
            print("framesAvailable.count:(frames.count)")
            //frames.sort(by:{$0<$1})
            var frameOrdersInSide:[Int:Frame] = [Int:Frame]()
            print("PREPARING NEW SIDE'S FRAMES")
            for sideFrame in frames{
                for orderInSide in sideFrame.orderInSides!.allObjects as! [FrameOrderInSide]{
                    if orderInSide.side == side {
                        print("FOUND MATCHING SIDE IN FRAME.ORDERINSIDES")
                        print("orderInSide:(orderInSide.index)")
                        print("sideFrame:(sideFrame)")
                        frameOrdersInSide[Int(orderInSide.index)] = sideFrame //index for frame in this side should never match another frame's index
                    }
                }
            }
            print("frameOrdersInSide:(frameOrdersInSide)")
            print("frameOrdersInSide.count:(frameOrdersInSide.count)")
            var sortedFramesInSide:[Frame] = [Frame]()
            for frameIndexInSide in 0..<(frameOrdersInSide.keys.sorted(by:{$0<$1})).count{
                sortedFramesInSide.append(frameOrdersInSide[frameIndexInSide]!) //array of Frames in order of the index in the side
            }
            framesForSides.append(sortedFramesInSide)
        }

这是从数据的初始负载中显示的控制台结果，而无需关闭模拟器：

sides count:2
side:0.0
side:1.0
currentSideIndex: 0
currentSide: <FlashTags.Side: 0x6000000898d0> (entity: Side; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p1> ; data: {
    frames =     (
        "0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1>",
        "0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2>"
    );
    orderInFlashcard = 0;
})
framesAvailable:[<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
}), <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
        "0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
    );
})]
framesAvailable.count:2
PREPARING NEW SIDE'S FRAMES
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:1.0
sideFrame:<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
})
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:0.0
sideFrame:<FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
        "0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
    );
})
frameOrdersInSide:[0: <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
        "0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
    );
}), 1: <FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
})]
frameOrdersInSide.count:2
currentSideIndex: 1
currentSide: <FlashTags.Side: 0x61800008a7d0> (entity: Side; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p2> ; data: {
    frames =     (
        "0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1>",
        "0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2>"
    );
    orderInFlashcard = 1;
})
framesAvailable:[<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
}), <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
        "0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
    );
})]
framesAvailable.count:2
PREPARING NEW SIDE'S FRAMES
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:0.0
sideFrame:<FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
})
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:1.0
sideFrame:<FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
        "0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
    );
})
frameOrdersInSide:[0: <FlashTags.Frame: 0x600000089740> (entity: Frame; id: 0xd00000000004000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd00000000008000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd00000000004000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
}), 1: <FlashTags.Frame: 0x600000089510> (entity: Frame; id: 0xd00000000008000a <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd00000000010000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>",
        "0xd0000000000c000c <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>"
    );
})]
frameOrdersInSide.count:2

关闭模拟器后，这是控制台中所示的问题：

sides count:2
side:0.0
side:1.0
currentSideIndex: 0
currentSide: <FlashTags.Side: 0x600000289420> (entity: Side; id: 0xd00000000004000e <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p1> ; data: {
    frames = "<relationship fault: 0x600000028940 'frames'>";
    orderInFlashcard = 0;
})
framesAvailable:[<FlashTags.Frame: 0x600000286810> (entity: Frame; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: <fault>), <FlashTags.Frame: 0x600000286bd0> (entity: Frame; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: <fault>)]
framesAvailable.count:2
PREPARING NEW SIDE'S FRAMES
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:1.0
sideFrame:<FlashTags.Frame: 0x600000286810> (entity: Frame; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd000000000080012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd000000000040012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
})
FOUND MATCHING SIDE IN FRAME.ORDERINSIDES
orderInSide:0.0
sideFrame:<FlashTags.Frame: 0x600000286bd0> (entity: Frame; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd0000000000c0012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>",
        "0xd000000000100012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>"
    );
})
frameOrdersInSide:[0: <FlashTags.Frame: 0x600000286bd0> (entity: Frame; id: 0xd000000000080010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p2> ; data: {
    html = "{{englishKeyword}}";
    name = front;
    orderInSides =     (
        "0xd0000000000c0012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p3>",
        "0xd000000000100012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p4>"
    );
}), 1: <FlashTags.Frame: 0x600000286810> (entity: Frame; id: 0xd000000000040010 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Frame/p1> ; data: {
    html = "{{kanjiImage}}";
    name = back;
    orderInSides =     (
        "0xd000000000080012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p2>",
        "0xd000000000040012 <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/FrameOrderInSide/p1>"
    );
})]
frameOrdersInSide.count:2
currentSideIndex: 1
currentSide: <FlashTags.Side: 0x6000002894c0> (entity: Side; id: 0xd00000000008000e <x-coredata://AABA51C1-C3ED-4701-A7DD-BE1CB7B66995/Side/p2> ; data: {
    frames = "<relationship fault: 0x600000029b00 'frames'>";
    orderInFlashcard = 1;
})
framesAvailable:[]
framesAvailable.count:0
PREPARING NEW SIDE'S FRAMES
frameOrdersInSide:[:]
frameOrdersInSide.count:0

更改我的核心数据设计后更新的抽认卡加载代码：

var sides:[Side] = (flashcard!.cardType!.sides!.allObjects as! [Side])
        sides.sort(by:{$0.orderInFlashcard<$1.orderInFlashcard}) //sides sorted by orderInFlashcard
        currentSideIndex = 0
        for sideIndex in 0..<sides.count{
            let side:Side = sides[sideIndex]
            let framesOrderInSide:[FrameOrderInSide] = (side.frameOrders!.allObjects as! [FrameOrderInSide]).sorted(by:{$0.index<$1.index})
            framesForSides.append(framesOrderInSide.map({$0.frame}))
        }

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