ios - RestKit - 'Cannot add object with entity ' entityName' 为 'entityName'' 的实体缓存

Question

我在 uitabbarcontroller 中有带三个 View Controller 的 iPad 应用程序。在每个 View Controller 中，我调用不同的 Web 服务并使用 RestKit 将它们映射到核心数据实体，然后使用 nsfetchedresultscontroller 在 uitableview 中显示数据。有关我的实现的更多信息是 here .

第一次加载数据时，数据已正确加载并映射到每个 View Controller 上，但在其中一个 View Controller 中，当我在 View Controller 3 中加载数据后尝试重新加载 View Controller 2 中的数据时，应用程序因以下错误而崩溃:

2015-11-07 00:17:45.205 PharmacyStockTake[193:3854] Trestkit.network:RKResponseMapperOperation.m:504 将 HTTP 响应映射到 nil 目标对象...2015-11-07 00:17:45.206 PharmacyStockTake [193:3854]我restkit.core_data:RKInMemoryManagedObjectCache.m:94通过属性“stockTakeLocId”缓存实体“RackStockTakeStatus”的实例2015-11-07 00:17:45.213 PharmacyStockTake[193:3854] * -[RKEntityByAttributeCache addObjects:completion:] 中的断言失败，/Users/saif/Documents/iDev/ComPrjs/PharmacyStockTake/Pods/RestKit/Code/CoreData/RKEntityByAttributeCache.m:3332015-11-07 00:17:45.214 PharmacyStockTake[193:3854] * 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因:“无法添加具有实体“RackStockTakeStatus”的对象来缓存“RackStockTakeStatus”实体'*** 首先抛出调用栈:(0x2201585b 0x33a5adff 0x22015731 0x22da6ddb 0x14b67b 0x21d9034b 0x21d9022d 0x14b175 0x15a9e1 0x21d9034b 0x21d9022d 0x15a71d 0 x161327 0x17bfb9 0x17a769 0x220091e9 0x21f8bbdb 0x17a65b 0x17c21b 0x17c9cd 0x17d271 0x22d283cf 0x1c3925 0x21d9034b 0x422d03 0 x42c4fb 0x21d90247 0x1c26bb 0x1c072d 0x22d283cf 0x22dd682d 0x42d61b 0x425f53 0x42eb0f 0x42e961 0x34314e0d 0x343149fc)libc++abi.dylib:以 NSException 类型的未捕获异常终止

这是我的代码:

在AppDelegate中初始化RestKit:

RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];
    
    //[RKObjectManager setSharedManager:objectManager];
    [RKObjectManager setSharedManager:objectManager];
    
    
    // Initialize managed object model from bundle
    NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    
    // Initialize managed object store
    RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
    objectManager.managedObjectStore = managedObjectStore;
    
    // Complete Core Data stack initialization
    [managedObjectStore createPersistentStoreCoordinator];
    NSString *storePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"StockTakeDB.sqlite"];
    NSString *seedPath = [[NSBundle mainBundle] pathForResource:@"StoreItemsDB" ofType:@"sqlite"];
    NSError *error;
    NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath fromSeedDatabaseAtPath:seedPath withConfiguration:nil options:nil error:&error];
    NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);
    
    // Create the managed object contexts
    [managedObjectStore createManagedObjectContexts];
    
    // Configure a managed object cache to ensure we do not create duplicate objects
    managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.persistentStoreManagedObjectContext];

View-Controller-2 中的 RestKit 初始化和配置代码:

-(void)initTakeStockRestKit
{
    takeStockLocationWithStatusRequestPath = @"/stocktake/stocktake/1/usr/1/locwithstatus";
    RKObjectManager *objectManager = [RKObjectManager sharedManager];
    
    [[NSURLCache sharedURLCache] removeAllCachedResponses];

    // Initialize managed object model from bundle
    NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    
    // Initialize managed object store
    RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
    objectManager.managedObjectStore = managedObjectStore;
    
    // Complete Core Data stack initialization
    [managedObjectStore createPersistentStoreCoordinator];
    NSString *storePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"StockTakeDB.sqlite"];
    NSString *seedPath = [[NSBundle mainBundle] pathForResource:@"StoreItemsDB" ofType:@"sqlite"];
    NSError *error;
    NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath fromSeedDatabaseAtPath:seedPath withConfiguration:nil options:nil error:&error];
    NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);
    
    // Create the managed object contexts
    [managedObjectStore createManagedObjectContexts];
    
    // Configure a managed object cache to ensure we do not create duplicate objects
    managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.persistentStoreManagedObjectContext];
    
    [objectManager addFetchRequestBlock:^NSFetchRequest *(NSURL *URL) {
        RKPathMatcher *pathMatcher = [RKPathMatcher pathMatcherWithPattern:takeStockLocationWithStatusRequestPath];
        
        NSDictionary *argsDict = nil;
        BOOL match = [pathMatcher matchesPath:[URL relativePath] tokenizeQueryStrings:NO parsedArguments:&argsDict];
        
        if (match) {
            NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"RackStockTakeStatus"];
            return fetchRequest;
        }
        return nil;
    }];

    RKEntityMapping *rackStockTakeStatusListMapping = [RKEntityMapping mappingForEntityForName:@"RackStockTakeStatus" inManagedObjectStore:managedObjectStore];
    rackStockTakeStatusListMapping.identificationAttributes = @[@"stockTakeLocId"];
    
    [rackStockTakeStatusListMapping addAttributeMappingsFromDictionary:
     @{
       @"stockTakeLocId" : @"stockTakeLocId",
       @"stockTakeUuid" : @"stockTakeUuid",
       @"locId" : @"locId",
       @"locName" : @"locName",
       @"status" : @"status",
       @"stockTakeByUser" : @"stockTakeByUser",
       @"stockTakeByUserId" : @"stockTakeByUserId",
       @"beginTime" : @"beginTime",
       @"percentCompleted" : @"percentCompleted"
       }
     ];
    
    RKResponseDescriptor *rackStockTakeStatusListResponseDescriptor =
    [RKResponseDescriptor responseDescriptorWithMapping:rackStockTakeStatusListMapping
                                                 method:RKRequestMethodGET
                                            pathPattern:@"/stocktake/stocktake/:id/usr/:id/locwithstatus"
                                                keyPath:nil
                                            statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)
     ];
    
    [objectManager addResponseDescriptor:rackStockTakeStatusListResponseDescriptor];
}

View-Controller-2 上的数据加载:

NSString *requestPath = [NSString stringWithFormat:@"/stocktake/stocktake/%@/usr/1/locwithstatus",[defaults objectForKey:@"loggedInUserSelectedStoreId"]];

[[RKObjectManager sharedManager]
     getObjectsAtPath:requestPath
     parameters:nil
     success: ^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
          NSManagedObjectContext *context = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"RackStockTakeStatus" inManagedObjectContext:context];
   [request setEntity:entity];
    NSError *error;
    [context executeFetchRequest:request error:&error];
          NSError *error;
    if (![[self fetchedResultsController] performFetch:&error]) {
    }
         [self.tableView reloadData];
         NSLog(@"requestDataItemsForStore - Mapping Success");
     }
     failure: ^(RKObjectRequestOperation *operation, NSError *error) {
         RKLogError(@"Load failed with error: %@", error);
         NSLog(@"requestDataItemsForStore - Loading Failed");
     }
     ];

View-Controller-3 中的 RestKit 初始化和配置代码:

RKObjectManager *objectManager = [RKObjectManager sharedManager];
    
    // Initialize managed object model from bundle
    NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    
    // Initialize managed object store
    RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
    objectManager.managedObjectStore = managedObjectStore;
    
    // Complete Core Data stack initialization
    [managedObjectStore createPersistentStoreCoordinator];
    NSString *storePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"StockTakeDB.sqlite"];
    NSString *seedPath = [[NSBundle mainBundle] pathForResource:@"StoreItemsDB" ofType:@"sqlite"];
    NSError *error;
    NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath fromSeedDatabaseAtPath:seedPath withConfiguration:nil options:nil error:&error];
    NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);
    
    // Create the managed object contexts
    [managedObjectStore createManagedObjectContexts];
    
    // Configure a managed object cache to ensure we do not create duplicate objects
    managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.persistentStoreManagedObjectContext];
    
    [objectManager addFetchRequestBlock:^NSFetchRequest *(NSURL *URL) {
        RKPathMatcher *pathMatcher = [RKPathMatcher pathMatcherWithPattern:itemsByLocationRequestPath];
        
        NSDictionary *argsDict = nil;
        BOOL match = [pathMatcher matchesPath:[URL relativePath] tokenizeQueryStrings:NO parsedArguments:&argsDict];
        
        if (match) {
            NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"ItemsByLocation"];
            return fetchRequest;
        }
        
        return nil;
    }];
    
        RKEntityMapping *itemsByLocationListMapping = [RKEntityMapping mappingForEntityForName:@"ItemsByLocation" inManagedObjectStore:managedObjectStore];
        itemsByLocationListMapping.identificationAttributes = @[@"itemId"];
    
        [itemsByLocationListMapping addAttributeMappingsFromDictionary:
         @{
           @"itemId" : @"itemId",
           @"itemName" : @"itemName",
           @"itemCode" : @"itemCode",
           @"uomCode" : @"uomCode",
           @"locId" : @"locId",
           @"locName" : @"locName",
           @"subLocId" : @"subLocId",
           @"subLocName" : @"subLocName",
           @"storeItemId" : @"storeItemId",
           @"stockTakeQtyId" : @"stockTakeQtyId",
           @"countedTime" : @"countedTime",
           @"countQty" : @"countQty",
           @"removed" : @"removed",
           @"remarks" : @"remarks"
           }
         ];
    
        RKResponseDescriptor *itemsByLocationListResponseDescriptor =
        [RKResponseDescriptor responseDescriptorWithMapping:itemsByLocationListMapping
                                                     method:RKRequestMethodGET
                                                pathPattern:@"/stocktake/stocktake/:id/loc/:id/usr/:id/items"
                                                    keyPath:nil
                                                statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)
         ];
    
        [objectManager addResponseDescriptor:itemsByLocationListResponseDescriptor];

View Controller-3 上的数据加载:

    [[RKObjectManager sharedManager]
     getObjectsAtPath:itemsByLocationRequestPath
     parameters:nil
     success: ^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
         NSManagedObjectContext *context = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"ItemsByLocation"];
    
    NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"subLocName" ascending:YES];
    fetchRequest.sortDescriptors = @[descriptor];
    
    NSError *error = nil;
    [context executeFetchRequest:fetchRequest error:&error];
          NSError *error;
    if (![[self fetchedResultsController] performFetch:&error]) {

    }
         [self.tableView reloadData];
         NSLog(@"requestDataItemsForStore - Mapping Success");
     }
     failure: ^(RKObjectRequestOperation *operation, NSError *error) {
         RKLogError(@"Load failed with error: %@", error);
         NSLog(@"requestDataItemsForStore - Loading Failed");
     }
     ];

你能帮忙解决这个问题吗？

Answer 1

这是一个线程和/或多上下文问题。您的实体缓存是在一个上下文中设置的，但随后您从不同的上下文中使用它(这就是实体具有相同名称但不同的原因)。

这可能是因为您正在设置多个不同的核心数据堆栈(从代码示例中看起来是这样)。在这种情况下，您应该分解出所有核心数据堆栈并将创建代码映射到一个新类 - 数据管理器中。将数据管理器传递给每个 View Controller ，以便它们可以使用它来下载所需的内容。

如果是线程问题，则打开核心数据线程异常可以帮助您找到原因。

请注意，在每个 View Controller 中使用 FRC 很好，但是您应该只有一个主线程上下文来设置它们。