查找dynamodb中是否存在分区键

Question

我需要检查 dynamodb 表中是否存在分区键（电子邮件）

我正在使用带有 typescript 的 astro 操作，它返回的错误是：

ValidationException：提供的关键元素与架构不匹配

我可以在控制台中看到它，如果我搜索它，它就会找到它。

我做错了什么？

桌子

政策：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::xxxx:user/xxxx"
      },
      "Action": [
        "dynamodb:GetItem",
        "dynamodb:Query",
        "dynamodb:PutItem",
        "dynamodb:Scan"
      ],
      "Resource": "arn:aws:dynamodb:xxx:xxxxx:table/votos"
    }
  ]
}

错误：

ValidationException: The provided key element does not match the schema
at throwDefaultError (C:\visual_studio\votacion\node_modules.pnpm@[email protected]\node_modules@smithy\smithy-client\dist-cjs\index.js:836:20)
at C:\visual_studio\votacion\node_modules.pnpm@[email protected]\node_modules@smithy\smithy-client\dist-cjs\index.js:845:5
at de_CommandError (C:\visual_studio\votacion\node_modules.pnpm@[email protected]\node_modules@aws-sdk\client-dynamodb\dist-cjs\index.js:2233:14)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async C:\visual_studio\votacion\node_modules.pnpm@[email protected]\node_modules@smithy\middleware-serde\dist-cjs\index.js:35:20
at async C:\visual_studio\votacionl\node_modules.pnpm@[email protected]_@[email protected]\node_modules@aws-sdk\lib-dynamodb\dist-cjs\index.js:166:30
at async C:\visual_studio\votacion\node_modules.pnpm@[email protected]\node_modules@smithy\core\dist-cjs\index.js:168:18
at async C:\visual_studio\votacion\node_modules.pnpm@[email protected]\node_modules@smithy\middleware-retry\dist-cjs\index.js:320:38
at async C:\visual_studio\votacion\node_modules.pnpm@[email protected]\node_modules@aws-sdk\middleware-logger\dist-cjs\index.js:34:22
at async chequeaVoto (C:/visual_studio/votacion/src/actions/index.ts:53:20) {
'$fault': 'client',
'$metadata': {
httpStatusCode: 400,
requestId: 'sfadfasfasfas',
extendedRequestId: undefined,
cfId: undefined,
attempts: 1,
totalRetryDelay: 0
},
__type: 'com.amazon.coral.validate#ValidationException'
}

代码：

import { dynamodb } from "@/aws";
import { GetCommand, PutCommand } from "@aws-sdk/lib-dynamodb";

async function chequeaVoto(emailVoto: string): Promise<string | false> {
  console.log("emailVoto llego:", emailVoto);
  const params = {
    TableName: "votos",
    Key: {
      email: emailVoto,
    },
  };

  try {
    const result = await dynamodb.send(new GetCommand(params));
    console.log("Resultado de la consulta chequeo:", result.Item);
    // Verifica si existe el item y devuelve el voto o false
    return result.Item ? result.Item.voto : false;
  } catch (error) {
    console.error("Error en la consulta:", error);
    return false; // Devuelve false en caso de error
  }
}

Answer 1

您使用的 GetItem 命令需要完整的主键作为参数，但您只传递分区键。要仅使用分区键，只需将命令更改为 QueryCommand：

import { dynamodb } from "@/aws";
import { QueryCommand, PutCommand } from "@aws-sdk/lib-dynamodb";

async function chequeaVoto(emailVoto: string): Promise<string | false> {
  console.log("emailVoto llego:", emailVoto);
  const params = {
    TableName: "votos",
    KeyConditionExpression: "#a = :v",
    ExpressionAttributeNames: {
        "#a": "email"
    }, 
    ExpressionAttributeValues: {
        ":v": emailVoto
    }

  };

  try {
    const result = await dynamodb.send(new QueryCommand(params));
    console.log("Resultado de la consulta chequeo:", result.Items);
    // Verifica si existe el item y devuelve el voto o false
    return result.Items ? result.Items[0].voto : false;
  } catch (error) {
    console.error("Error en la consulta:", error);
    return false; // Devuelve false en caso de error
  }
}