Core data 具有CoreData崩溃的RestKit

我是CoreData的新手，刚刚开始使用RestKit。我正在尝试使用CoreData创建一个Restkit项目。但我得到了这个运行时错误：

+[NSManagedObject managedObjectContext]中的断言失败

有什么想法吗，我做错了什么

以下是到目前为止我的代码。到目前为止，我还没有创建数据模型

     _objectManager = [RKObjectManager objectManagerWithBaseURL:@"https://api.foursquare.com/v2/venues"];
  //  _objectManager.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"jiffAssignment.sqlite"];

    RKManagedObjectMapping *locationMapping = [RKManagedObjectMapping mappingForClass:[Location class]];
    [locationMapping mapKeyPath:@"address" toAttribute:@"address"];
    [locationMapping mapKeyPath:@"crossStreet" toAttribute:@"crossStreet"];
    [locationMapping mapKeyPath:@"city" toAttribute:@"city"];
    [locationMapping mapKeyPath:@"state" toAttribute:@"state"];
    [_objectManager.mappingProvider setMapping:locationMapping forKeyPath:@"location"];

  //  RKObjectMapping *statisticsMapping = [RKManagedObjectMapping mappingForClass:[Statistics class]];
 //   [statisticsMapping mapAttributes:@"checkinsCount",@"usersCount", nil];


    NSLog(@"VenueListController Initialized");
    return self;

如有任何帮助/意见，将不胜感激

谢谢

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Vik

你能用失败的实际断言更新你的帖子吗

如果_objectManager没有objectStore集，您就不能使用RKManagedObjectMapping。这一行在您发布的代码中被注释掉