分区密钥问题azure cosmos db异步api

Question

所以我正在尝试使用以下代码在cosmos中创建一个新文档：

 fun newDoc(key: String, data: Any, id: String){
    policy.setConnectionMode(ConnectionMode.Direct);

    val asyncClient = AsyncDocumentClient.Builder()
        .withServiceEndpoint("https://ara-account-data.documents.azure.com:443/")
        .withMasterKeyOrResourceToken(System.getenv("IOTDB") )
        .withConnectionPolicy(policy)
        .withConsistencyLevel(ConsistencyLevel.Eventual)
        .build()
    val doc =
        Document(data, id, "user-$key")
    val options = RequestOptions()
    options.partitionKey = PartitionKey("user-$key")
    val createDocumentObservable: Observable<ResourceResponse<com.microsoft.azure.cosmosdb.Document>> =
        asyncClient.createDocument("dbs/Ara-android-database/colls/Ara-android-collection", doc, options, true)
    createDocumentObservable
        .single() // we know there will be one response
        .subscribe(
            { documentResourceResponse: ResourceResponse<com.microsoft.azure.cosmosdb.Document> ->
                println(
                    documentResourceResponse.requestCharge
                )
            },
            { error: Throwable ->
                System.err.println("an error happened: " + error.message)
                throw  error
            }
        )

}

但我收到此错误

an error happened: ["PartitionKey extracted from document doesn't match the one specified in the header"], 

RequestStartTime：“ 2020年2月20日01：40：14.716”，RequestEndTime：“ 2020年2月20日01：40：18.003”，持续时间：3287毫秒，尝试的区域数：1

任何帮助都会很棒：}