Question

我有一个简单的AppSync API，该API具有适用于City和Venue的类型，示例是映射小型零售商店。我正在尝试通过AppSync中的“查询”窗格创建一个新的城市，我也想提供一个缩短的ID-与长的autoId相对，以便我可以查询缩短的ID，并且前端应用可以从URL的参数中使用它。

我正在尝试使用以下代码在DynamoDB中创建一个新项目：

模式

type City {
  id: String!
  name: String!
}

type Mutation {
  ...
  createCity(input: CreateCityInput!): City
  ...
}

input CreateCityInput {
  id: String!
  name: String!
}

Mutation.createCity

// Request mapping template

{
  "version" : "2017-02-28",
  "operation" : "PutItem",
  "key" : {
    ## If object "id" should come from GraphQL arguments, change to $util.dynamodb.toDynamoDBJson($ctx.args.id)
    "id": $util.dynamodb.toDynamoDBJson($ctx.args.id)
  },
  "attributeValues" : $util.dynamodb.toMapValuesJson($ctx.args)
}

// Response mapping template
$util.toJson($context.result)

这是我在“查询”页面中运行的变异

mutation CreateCity {
  createCity(input: {
    id: "11538062"
    name: "Manchester"
  }) {
    id
    name
  }
}

这是从AppSync和或Dynamo返回的错误

{
  "data": {
    "createCity": null
  },
  "errors": [
    {
      "path": [
        "createCity"
      ],
      "data": null,
      "errorType": "DynamoDB:AmazonDynamoDBException",
      "errorInfo": null,
      "locations": [
        {
          "line": 32,
          "column": 3,
          "sourceName": null
        }
      ],
      "message": "One or more parameter values were invalid: Type mismatch for key id expected: S actual: NULL (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: 7PU4D2...)"
    }
  ]
}

任何帮助将不胜感激，我看不到为什么我无法使用提供的String作为ID并将其标识为NULL来执行简单的Create ...

Answer 1

## Request Mapping

{
  "version" : "2017-02-28",
  "operation" : "PutItem",
  "key" : {
    "id" : $util.dynamodb.toDynamoDBJson($ctx.args.input.id)
  },
  "attributeValues" : {
    "name" : $util.dynamodb.toDynamoDBJson($ctx.args.input.name)
  }
}

AWS AppSync-创建变异返回Null

1 个答案: