Core data 需要在restkit配置的应用程序中选择核心数据并发布

我还没有找到从现有的核心数据SQLite数据库中选择数据并发布的示例。根据调试输出，我的核心数据似乎配置正常。我已将其设置为显示SQLite操作。当我尝试对布尔属性执行谓词或加载时，它不会给出错误，但检索到零个对象

@interface Offering : NSManagedObject

@property (nonatomic, retain) NSNumber * id;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSNumber * uploadToServerRequired; 



#import "AppDelegate.h"
#import <RestKit/RestKit.h>
#import "Offering.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize managedObjectContext = __managedObjectContext;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions


    RKObjectManager* manager = 
    [RKObjectManager objectManagerWithBaseURL: [[NSURL  alloc] initWithString:@"http://localhost:8080/anywhereAboutWebServices"] ];
    manager.objectStore = [RKManagedObjectStore objectStoreWithStoreFilename:@"AnywhereAbout2.sqlite"];

 NSError *error;

    NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"AnywhereAbout2.sqlite"];
    NSURL *url = [NSURL fileURLWithPath:path];

    NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    NSPersistentStoreCoordinator *persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel];
    if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url options:[NSDictionary dictionaryWithObjectsAndKeys:     [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,                                 [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil] error:&error]);
    else {
        __managedObjectContext = [[NSManagedObjectContext alloc] init];
        [__managedObjectContext setPersistentStoreCoordinator: persistentStoreCoordinator];

    }

    NSArray* objects = [Offering allObjects];
    NSLog(@"We loaded %d objects", [objects count]);

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"uploadToServerRequired == %@", [NSNumber numberWithBool: (BOOL)1]];


    int count = [filtered count];

---

添加了以下内容并使其正常工作：

NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Offering" inManagedObjectContext:__managedObjectContext];
[request setEntity:entity];

NSError *anyError = nil;
NSArray *fetched = [__managedObjectContext executeFetchRequest:request error: &anyError];
if (fetched == nil) {
     NSLog(@"Error with fetch");
}
NSLog(@"We fetched %d objects", [fetched count]);

---

为什么我没有得到任何结果？为什么这不起作用？还有一个附带的问题：有人看到过从核心数据发布的好例子吗。我买了一本关于核心数据的书，我想我几乎找到了主要问题的答案：需要更多到托管对象上下文的链接。你是本地人，将核心数据代码与Restkit混合在一起，这让我觉得你做的事情不正常。下载RestKit并查看他们的RKTwitterCoreData示例。添加以下内容并将其添加到workNSFetchRequest*request=[[NSFetchRequest alloc]init]；NSEntityDescription*实体=[NSEntityDescription entityForName:@OfferingInManagedObjectContext:u managedObjectContext]；[请求集合实体：实体]；n错误*anyError=nil；NSArray*fetched=[\uuu managedObjectContext executeFetchRequest:请求错误：&anyError]；如果获取==nil{NSLog@Error使用fetch；}NSLog@We已获取%d个对象，[已获取计数]；