在.xcdatamodel CLI中导入CoreData

Question

CoreData命令行工具有一个小问题。我只是在XCode ( created )中创建了一个新项目，在.xcdatamodel文件中创建了一个数据模型，并自动生成了一个头文件。最后，我修改了代码，应该能够加载实体。

程序编译时没有错误，但如果运行该程序，则会得到以下错误

2010-08-26 20:16:52.031 Core Data Test[866:903] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Kunde''
*** Call stack at first throw:
(
 0   CoreFoundation                      0x00007fff884bbcc4 __exceptionPreprocess + 180
 1   libobjc.A.dylib                     0x00007fff85a630f3 objc_exception_throw + 45
 2   CoreData                            0x00007fff821467a9 +[NSEntityDescription entityForName:inManagedObjectContext:] + 153
 3   CoreData                            0x00007fff821798a1 +[NSEntityDescription insertNewObjectForEntityForName:inManagedObjectContext:] + 33
 4   Core Data Test                      0x0000000100001abf managedObjectModel + 95
 5   Core Data Test                      0x0000000100001b7f managedObjectContext + 156
 6   Core Data Test                      0x00000001000019b7 main + 47
 7   Core Data Test                      0x0000000100001980 start + 52
 8   ???                                 0x0000000000000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
Abort trap

以下是我的代码: svn://homes.dnsalias.com/CoreDataOwnTesting或简单复制

svn co svn://homes.dnsalias.com:3690/CoreDataOwnTesting

有人知道我做错了什么吗？谢谢你的帮助！丹尼斯

代码由JLN添加

NSManagedObjectModel *managedObjectModel();
NSManagedObjectContext *managedObjectContext();
NSManagedObjectContext *context;


int main (int argc, const char * argv[]) {

    objc_startCollectorThread();

    // Create the managed object context
    context = managedObjectContext();

    NSManagedObjectModel *kunde = managedObjectModel();

    // Save the managed object context
    NSError *error = nil;    
    if (![context save:&error]) {
        NSLog(@"Error while saving\n%@",
              ([error localizedDescription] != nil) ? [error localizedDescription] : @"Unknown Error");
        exit(1);
    }
    return 0;
}



NSManagedObjectModel *managedObjectModel() {

    static NSManagedObjectModel *model = nil;

    if (model != nil) {
        return model;
    }

    model = [NSEntityDescription insertNewObjectForEntityForName:@"Kunde" inManagedObjectContext:context];

    /*NSString *path = [[[NSProcessInfo processInfo] arguments] objectAtIndex:0];
    path = [path stringByDeletingPathExtension];
    NSURL *modelURL = [NSURL fileURLWithPath:[path stringByAppendingPathExtension:@"mom"]];
    model = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
    */

    return model;
}



NSManagedObjectContext *managedObjectContext() {

    static NSManagedObjectContext *context = nil;
    if (context != nil) {
        return context;
    }

    context = [[NSManagedObjectContext alloc] init];

    NSPersistentStoreCoordinator *coordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: managedObjectModel()];
    [context setPersistentStoreCoordinator: coordinator];

    NSString *STORE_TYPE = NSSQLiteStoreType;

    NSString *path = [[[NSProcessInfo processInfo] arguments] objectAtIndex:0];
    path = [path stringByDeletingPathExtension];
    NSURL *url = [NSURL fileURLWithPath:[path stringByAppendingPathExtension:@"sqlite"]];

    NSError *error;
    NSPersistentStore *newStore = [coordinator addPersistentStoreWithType:STORE_TYPE configuration:nil URL:url options:nil error:&error];

    if (newStore == nil) {
        NSLog(@"Store Configuration Failure\n%@",
              ([error localizedDescription] != nil) ?
              [error localizedDescription] : @"Unknown Error");
    }

    return context;
}

Answer 1

在设置Core Data的方式上，您似乎遇到了一些基本问题。也就是说，第一个问题(我就此停止了)是，您正在尝试从一个NSManagedObjectModel创建一个NSEntityDescription实例。轰隆隆。

你读过并跟踪过核心数据实用程序教程吗？学习本教程并报告您在那里发现的问题比在这里学习它的说明要容易得多。