核心数据迁移失败 [英] Core Data Migration Fail

问题描述

我的应用最近因为未迁移数据而在应用商店中崩溃。因此，我正在关注教程

My app was recently crashing on the app store because I did not migrate the data. So I was following this tutorial on Core Data Migration but it does not seem to be working:

1。我为Core Data创建了一个新的模型版本，并将其设置为当前版本...

1.I created a new model version for Core Data and set it to the current version...

2。我添加了以下代码：

2.I added the following code:

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    if (_persistentStoreCoordinator != nil) {
        return _persistentStoreCoordinator;
    }
    
    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"Planner.sqlite"];
    
    NSError *error = nil;
    _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    NSDictionary *options = @{
                              NSMigratePersistentStoresAutomaticallyOption : @YES,
                              NSInferMappingModelAutomaticallyOption : @YES
                              };
    if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {

        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }    
    
    return _persistentStoreCoordinator;
}

但是当我在iPhone上运行更新应用程序时，它仍然崩溃！

However when I run update the app on my iPhone it still crashes!

我所做的更改是添加一个实体。

The changes I made was I added an entity.

以下是崩溃日志：

Unresolved error Error Domain=NSCocoaErrorDomain Code=134130 "The operation couldn’t be completed. (Cocoa error 134130.)" UserInfo=0x14fb4530 {URL=file:///var/mobile/Applications/E8C39F0E-027E-4D5B-8D7B-74D592290D46/Documents/Planner.sqlite, metadata={
    NSPersistenceFrameworkVersion = 479;
    NSStoreModelVersionHashes =     {
        Audio = <f195c962 11c85401 0457370e e1b037e1 24c4e393 dc38ca34 cda3bb57 a3e26f2c>;
        Classes = <3b64e147 eb41441b 73bf051f ce094443 2017845b 2faba1c7 47848618 9fd9713b>;
        Homework = <4295bdbf 75862060 c7f1a501 3b0934cd 9811e838 bc40c5d5 05f8d383 f315d1f8>;
        Notes = <b7be1214 70a89b62 924df103 397a801a 96080505 be87b0e2 408ebf24 fdddb1a7>;
        Picture = <451cd1a2 9daac38d 69165176 0cacb6c8 94d1e93d eca34239 61a15f35 573f7e40>;
        Tests = <c10b5b25 228ebceb 6099b9af c830d203 bfca8e2b c9f46ee8 c0cd648e 9ad3e742>;
        Video = <b95e2033 b45b5aaf 298fef31 e6e25685 2b842e4e f2b3d9d1 82359c5f db9c78eb>;
    };
    NSStoreModelVersionHashesVersion = 3;
    NSStoreModelVersionIdentifiers =     (
        ""
    );
    NSStoreType = SQLite;
    NSStoreUUID = "4327E676-759B-4733-A7ED-12309BD482EE";
    "_NSAutoVacuumLevel" = 2;
}, reason=Can't find model for source store}, {
    URL = "file:///var/mobile/Applications/E8C39F0E-027E-4D5B-8D7B-74D592290D46/Documents/Planner.sqlite";
    metadata =     {
        NSPersistenceFrameworkVersion = 479;
        NSStoreModelVersionHashes =         {
            Audio = <f195c962 11c85401 0457370e e1b037e1 24c4e393 dc38ca34 cda3bb57 a3e26f2c>;
            Classes = <3b64e147 eb41441b 73bf051f ce094443 2017845b 2faba1c7 47848618 9fd9713b>;
            Homework = <4295bdbf 75862060 c7f1a501 3b0934cd 9811e838 bc40c5d5 05f8d383 f315d1f8>;
            Notes = <b7be1214 70a89b62 924df103 397a801a 96080505 be87b0e2 408ebf24 fdddb1a7>;
            Picture = <451cd1a2 9daac38d 69165176 0cacb6c8 94d1e93d eca34239 61a15f35 573f7e40>;
            Tests = <c10b5b25 228ebceb 6099b9af c830d203 bfca8e2b c9f46ee8 c0cd648e 9ad3e742>;
            Video = <b95e2033 b45b5aaf 298fef31 e6e25685 2b842e4e f2b3d9d1 82359c5f db9c78eb>;
        };
        NSStoreModelVersionHashesVersion = 3;
        NSStoreModelVersionIdentifiers =         (
            ""
        );
        NSStoreType = SQLite;
        NSStoreUUID = "4327E676-759B-4733-A7ED-12309BD482EE";
        "_NSAutoVacuumLevel" = 2;
    };
    reason = "Can't find model for source store";
}

我已经设置了当前模型版本。

I already set the current model version.

任何

在此先感谢您，

阿卜杜拉·沙菲克

根据@Scott I必须撤消对我的源所做的所有更改，而仅更改目标

According to @Scott I have to undo all the changes to my source and only change the destination

有人可以解释一下吗？

推荐答案

尝试使用此代码检查模型版本并输出元数据

Try using this code to check the model versions and output the metadata

/*! The method checks the Core Data file version is compatible with the App's model version
    and then pushes the main menu view onto the navigation stack.  If not compatible it displays a 
    message to the user.

    @param file The file URL for the Core Data Store. With UIManagedDocument you have to get the 
                actual store file URL, you can't just use the UIManagedDocument file URL.
 */
-(voidcheckCoreDataFileVersion:(NSURL*)file
{
    if ([self checkVersion:file]) {

        // file version is compatible so continue (add code to push the menu view)


    } else {

        // file version is NOT compatible

        _fileOpenErrorAlert = [[UIAlertView alloc] initWithTitle:@"Unable to open Document" message:@"Please check that you have the correct application version installed" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [_fileOpenErrorAlert show];

    }
    return;
}
/*! Checks the Core Data files models version against the apps model version to see if they
    are compatible.  This will return YES if a lightweight migration can be performed and NO if NOT.

    @param fileURL The file URL for the Core Data Store. With UIManagedDocument you have to get the
                actual store file URL, you can't just use the UIManagedDocument file URL.
    @return  Returns YES if they are compatible and NO if not.
 */
- (bool)checkVersion:(NSURL*)fileURL {

    NSManagedObjectModel *model = [self managedObjectModel];

    NSLog(@" app model entity version hashes are %@", [model entityVersionHashesByName]);

    NSError *error;
    NSDictionary *metaData = [NSPersistentStoreCoordinator metadataForPersistentStoreOfType:NSSQLiteStoreType URL:fileURL error:&error];

    if (!metaData) {
        NSLog(@" problem getting metaData");
        NSLog(@"  - error is %@, %@", error, error.userInfo);
        return NO;
    }

    bool result = [model isConfiguration:nil compatibleWithStoreMetadata:metaData];
    if (!result) {
       NSLog(@" file is not compatible!");
       NSLog(@" metadata is %@", metaData);
    }

    return result;

}

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