ios - DynamoDB batchGetItem 返回错误 : "Supplied AttributeValue is empty"

Question

哈希和范围都指定了，它还认为一个是空的？还是在谈论其他一些属性？

返回的 task.result() 为 nil，task.error() 表示:

"Error Domain=com.amazonaws.AWSDynamoDBErrorDomain Code=0 "Supplied AttributeValue is empty, must contain exactly one of the supported datatypes" UserInfo=0x7ff3c0e21d40 {NSLocalizedDescription=Supplied AttributeValue is empty, must contain exactly one of the supported datatypes}"

我确信哈希和范围名称是正确的，表名也是如此。

用 Swift 编写，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 keysAndAttributes : AWSDynamoDBKeysAndAttributes = AWSDynamoDBKeysAndAttributes()
keysAndAttributes.keys = keysArray;

var requestMap : NSDictionary = ["myTableName":keysAndAttributes]

var request : AWSDynamoDBBatchGetItemInput = AWSDynamoDBBatchGetItemInput()
request.requestItems = requestMap

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

Answer 1

keysArray 在代码片段中的格式不正确。您正在创建一个 NSString : AWSDynamoDBCondition 字典，但它必须是 NSString : AWSDynamoDBAttributeValue 字典。以下引用可能有助于理解如何格式化 BatchGetItem 请求。

• BatchGetItem
• KeysAndAttributes
• AWSDynamoDBKeysAndAttributes