Question

我试图在Swift应用程序中从DynamoDB获取一些行。在我下面的代码的最后一行，我得到一个NSInvalidArgumentException。我认为一定是因为我的请求格式不正确，但我不知道出了什么问题。在java sdk的文档（batch operation sample）中，他们使用TableKeysAndAttributes，这似乎并不存在于iOS SDK中。

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]：无法识别的选择器发送到类0x10a9930e8 2014-12-18 13：23：17.010 TouchDashboard [8066：503166] ***由于未捕获的异常终止应用程序＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; + [__ NSDictionaryI JSONKeyPathsByPropertyKey]：无法识别的选择器发送到class 0x10a9930e8＆＃39; ***第一次抛出调用堆栈：（ 0 CoreFoundation 0x000000010a6ebf35 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x000000010c5b1bb7 objc_exception_throw + 45 2 CoreFoundation 0x000000010a6f2f4d + [NSObject（NSObject）doesNotRecognizeSelector：] + 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 - [UIApplication workspaceDidEndTransaction：] + 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 main + 42 37 libdyld.dylib 0x000000010cd8b145 start + 1 38 ??? 0x0000000000000001 0x0 + 1

Answer 1

AWSDynamoDBBatchGetItemInput的{{1}}属性需要是以下键/值对的字典：

requestItems（表格名称）：AWSDynamoDBKeysAndAttributes（NSString）

目前，您正在传递KeysAndAttributes的实例作为值。更新代码段以使用NSDictionary后，它应该可以正常工作。

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

1 个答案: