ios - AWS batchGetItem NSInvalidArgumentException JSONKeyPathsByPropertyKey:无法识别的选择器

Question

我正在尝试从Swift应用程序中的DynamoDB获取一些行。在下面代码的最后一行，我得到一个NSInvalidArgumentException。我认为一定是因为我的请求格式不正确，但是我不知道出了什么问题。在Java sdk的文档（batch operation sample）中，它们使用TableKeysAndAttributes，而iOS SDK中似乎不存在。

这是我的代码：

 var venueIdAttribute = AWSDynamoDBAttributeValue()
    venueIdAttribute.N = "2164156"

    var venueIdCondition = AWSDynamoDBCondition()
    venueIdCondition.comparisonOperator = .EQ // Hash Key must always be Equals
    venueIdCondition.attributeValueList = [venueIdAttribute]

    var startDateAttribute = AWSDynamoDBAttributeValue()
    var startString = String(format:"%1.0f", lastSyncDate.timeIntervalSince1970 * 1000)
    startDateAttribute.N = String(format:"%1.0f", lastSyncDate.timeIntervalSince1970 * 1000)

    var dateCondition = AWSDynamoDBCondition()
    dateCondition.comparisonOperator = .GT
    dateCondition.attributeValueList = [startDateAttribute];

    var keysArray : NSArray = [["venueId" : venueIdCondition, "dateInterval" : dateCondition]]
    var tableDict : NSDictionary = ["Keys":keysArray]
    var requestMap : NSDictionary = ["myTable":tableDict]

    var request : AWSDynamoDBBatchGetItemInput = AWSDynamoDBBatchGetItemInput()        
    request.requestItems = requestMap
    request.returnConsumedCapacity = AWSDynamoDBReturnConsumedCapacity.Total

    var response : BFTask = dynamoDB.batchGetItem(request)  // This is synchronous

这是错误：

2014-12-18 13：23：17.002 TouchDashboard [8066：503166] + [NSDictionaryI JSONKeyPathsByPropertyKey]：无法识别的选择器已发送给类0x10a9930e8
2014-12-18 13：23：17.010 TouchDashboard [8066：503166] ***由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'+ [__ NSDictionaryI JSONKeyPathsByPropertyKey]：无法识别的选择器已发送给类0x10a9930e8'
***首先抛出调用堆栈：
（
    0 CoreFoundation 0x000000010a6ebf35 __exceptionPreprocess + 165
    1个libobjc.A.dylib 0x000000010c5b1bb7 objc_exception_throw + 45
    2 CoreFoundation 0x000000010a6f2f4d + [NSObject（NSObject）didNotRecognizeSelector：] + 205
    3 CoreFoundation 0x000000010a64b27c ___forwarding_ + 988
    4 CoreFoundation 0x000000010a64ae18 _CF_forwarding_prep_0 + 120
    5 TouchDashboard 0x0000000109b1176a-[MTLJSONAdapter initWithModel：] + 490
    6 TouchDashboard 0x0000000109b0fc47 + [MTLJSONAdapter JSONDictionaryFromModel：] + 87
    7 TouchDashboard 0x00000001099a47c5 + [AZModelUtility JSONDictionaryFromMapMTLDictionary：] + 517
    8 TouchDashboard 0x0000000109a91c5b 59+ [AWSDynamoDBBatchGetItemInput requestItemsJSONTransformer] _block_invoke_2 + 75
    9 TouchDashboard 0x0000000109b21718-[MTLReversibleValueTransformer reverseTransformedValue：] + 88
    10 TouchDashboard 0x0000000109b11b90 __32- [MTLJSONAdapter JSONDictionary] _block_invoke + 480
    11 CoreFoundation 0x000000010a62d766 __65-[__ NSDictionaryM enumerateKeysAndObjectsWithOptions：usingBlock：] _ block_invoke + 102
    12 CoreFoundation 0x000000010a62d66c-[__ NSDictionaryM enumerateKeysAndObjectsWithOptions：usingBlock：] + 204
    13 TouchDashboard 0x0000000109b1192c-[MTLJSONAdapter JSONDictionary] + 300
    14 TouchDashboard 0x0000000109b0fc5b + [MTLJSONAdapter JSONDictionaryFromModel：] + 107
    15 TouchDashboard 0x00000001099a6829-[AWSDynamoDB invokeRequest：HTTPMethod：URLString：targetPrefix：operationName：outputClass：] + 313
    16 TouchDashboard 0x00000001099a6bd9-[AWSDynamoDB batchGetItem：] + 153
    17 TouchDashboard 0x000000010991a0d7 _TFC14TouchDashboard14ViewController9batchSyncfS0_FT_T_ + 10663
    18 TouchDashboard 0x0000000109917349 _TFC14TouchDashboard14ViewController11viewDidLoadfS0_FT_T_ + 1161
    19 TouchDashboard 0x0000000109917462 _TToFC14TouchDashboard14ViewController11viewDidLoadfS0_FT_T_ + 34
    20 UIKit 0x000000010b41ea90-[UIViewController loadViewIfRequired] + 738
    21 UIKit 0x000000010b41ec8e-[UIViewController视图] + 27
    22 UIKit 0x000000010b33dca9-[UIWindow addRootViewControllerViewIfPossible] + 58
    23 UIKit 0x000000010b33e041-[UIWindow setHidden：forced：] + 247
    24 UIKit 0x000000010b34a72c-[UIWindow makeKeyAndVisible] + 42
    25 UIKit 0x000000010b2f5061-[UIApplication _callInitializationDelegatesForMainScene：transitionContext：] + 2628
    26 UIKit 0x000000010b2f7d2c-[UIApplication _runWithMainScene：transitionContext：completion：] + 1350
    27 UIKit 0x000000010b2f6bf2-[UIApplicationworkspaceDidEndTransaction：] + 179
    28 FrontBoardServices 0x000000010ebe92a3 __31- [FBSSerialQueue performAsync：] _ block_invoke + 16
    29 CoreFoundation 0x000000010a62153c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 12
    30 CoreFoundation 0x000000010a617285 __CFRunLoopDoBlocks + 341
    31 CoreFoundation 0x000000010a616a43 __CFRunLoopRun + 851
    32 CoreFoundation 0x000000010a616486 CFRunLoopRunSpecific + 470
    33 UIKit 0x000000010b2f6669-[UIApplication _run] + 413
    34 UIKit 0x000000010b2f9420 UIApplicationMain + 1282
    35 TouchDashboard 0x000000010992ba2e top_level_code + 78
    36 TouchDashboard 0x000000010992ba6a主+ 42
    37 libdyld.dylib 0x000000010cd8b145开始+ 1
    38 ??? 0x0000000000000001 0x0 + 1

Answer 1

AWSDynamoDBBatchGetItemInput的requestItems属性必须是以下键/值对的字典：

NSString（表名）：AWSDynamoDBKeysAndAttributes（KeysAndAttributes）

当前，您正在传递NSDictionary的实例作为值。将代码段更新为使用AWSDynamoDBKeysAndAttributes后，它应该可以工作。