AWS batchGetItem NSInvalidArgumentException JSONKeyPathsByPropertyKey: unrecognized selector - ios

Question

I'm trying to get some rows from DynamoDB in a Swift application. At the very last line in my code below I get a NSInvalidArgumentException. I think it must be because my request is not formatted correctly, but I don't know what is wrong. In the docs (batch operation sample) for the java sdk they use TableKeysAndAttributes, which doesn't seem to exist in the iOS SDK.
Here is my code:
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
Here is the error:
2014-12-18 13:23:17.002 TouchDashboard[8066:503166] +[NSDictionaryI JSONKeyPathsByPropertyKey]: unrecognized selector sent to class 0x10a9930e8
2014-12-18 13:23:17.010 TouchDashboard[8066:503166] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[__NSDictionaryI JSONKeyPathsByPropertyKey]: unrecognized selector sent to class 0x10a9930e8'
*** First throw call stack:
(
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 view] + 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's requestItems property needs to be a dictionary of the following key/value pair:
NSString (a table name) : AWSDynamoDBKeysAndAttributes (KeysAndAttributes)
Currently, you are passing an instance of NSDictionary as a value. Once you update your code snippet to use AWSDynamoDBKeysAndAttributes, it should work.