DynamoDB/Scanamo : 제공된 키 요소가 스키마와 일치하지 않습니다.

Question

저는 Scanamo 라이브러리를 통해 DynamoDB를 사용하려고했습니다. 내 스칼라 코드는 다음과 같습니다

package my.package 

import com.amazonaws.ClientConfiguration 
import com.amazonaws.regions.{Region, Regions} 
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient 
import com.gu.scanamo._ 
import com.gu.scanamo.syntax._ 
import com.amazonaws.auth.{AWSStaticCredentialsProvider, BasicAWSCredentials} 
import com.amazonaws.services.dynamodbv2.datamodeling._ 

object MusicService { 

    def main(args: Array[String]): Unit = { 
    val musicService = new MusicService 
    musicService.getAlbums() 
    } 

} 

class MusicService { 

    def getAlbums() { 

    val awsCreds = new BasicAWSCredentials("my","creds") 
    val client = AmazonDynamoDBClient 
     .builder() 
     .withRegion(Regions.EU_WEST_2) 
     .withCredentials(new AWSStaticCredentialsProvider(awsCreds)) 
     .build(); 


    case class Music(@DynamoDBIndexRangeKey(attributeName = "Artist") 
     artist: String, @DynamoDBIndexHashKey(attributeName = "SongTitle") songTitle: String); 

    val table = Table[Music]("Music") 

    val putOp = table.putAll(Set(
     Music("The Killers", "Sam's Town"), 
     Music("The Killers", "Spaceman") 
    )) 
    Scanamo.exec(client)(putOp) 

} 

나는 putOp execing에이 오류를 얻고있다 :

Exception in thread "main" com.amazonaws.services.dynamodbv2.model.AmazonDynamoDBException: The provided key element does not match the schema (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: 0KAFH90JO39COO143LC5H6RPPNVV4KQNSO5AEMVJF66Q9ASUAAJG) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1638) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1303) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1055) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:743) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:717) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:699) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:667) 
at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:649) 
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:513) 
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.doInvoke(AmazonDynamoDBClient.java:2186) 
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:2162) 
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.executeBatchWriteItem(AmazonDynamoDBClient.java:575) 
at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.batchWriteItem(AmazonDynamoDBClient.java:551) 
at com.gu.scanamo.ops.ScanamoInterpreters$$anon$1.apply(ScanamoInterpreters.scala:51) 
at com.gu.scanamo.ops.ScanamoInterpreters$$anon$1.apply(ScanamoInterpreters.scala:30) 
at cats.free.Free.$anonfun$foldMap$1(Free.scala:126) 
at cats.package$$anon$1.tailRecM(package.scala:41) 
at cats.free.Free.foldMap(Free.scala:124) 
at cats.free.Free.$anonfun$foldMap$1(Free.scala:127) 
at cats.package$$anon$1.tailRecM(package.scala:41) 
at cats.free.Free.foldMap(Free.scala:124) 
at com.gu.scanamo.Scanamo$.exec(Scanamo.scala:17) 
at my.package.MusicService.getAlbums(MusicService.scala:39) 
at my.package.MusicService$.main(MusicService.scala:14) 
at my.package.MusicService.main(MusicService.scala) 

DynamoDB의에 내 테이블 구조가 매우 간단하고 다음과 같습니다

Table name: Music 
Partition key: Artist 
Sort key: SongTitle 

그게 전부입니다.

왜 이것이 실패하고 내가 해결할 수 있는지에 대한 안내를 해 주실 수 있습니까?

당신이 @DynamoDBIndexHashKey 및 @DynamoDBIndexRangeKey 교체하는 데 필요한 모든의

Answer 1

먼저 (@DynamoDBIndexHashKey 같은 해시 키를해야한다 - 종류의 키에 대한 아티스트 및 @DynamoDBIndexRangeKey - songTitle).

아티스트는 파티션 키이고 SongTitle은 정렬 키입니다. 그렇다면 @DynamoDBIndexHashKey과 @DynamoDBIndexRangeKey을 사용하는 이유는 무엇입니까? 대신 @DynamoDBHashKey 및 @DynamoDBRangeKey이 필요합니다 (아티스트 및 songTitle이 색인이 아닐 경우).