Is supported BatchDeleteItem for custom resolver?

[iparrabb]

Hello everybody!

I have a problem with a custom resolver using BatchDeleteItem operation.

mutation:

type Mutation {
    batchDeleteDocuments(ids: [ID]): [Document]
}

resolver

"BatchDeleteDocumentsResolver": {
    "Type": "AWS::AppSync::Resolver",
    "Properties": {
        "ApiId": {
            "Ref": "AppSyncApiId"
        },
        "DataSourceName": "DocumentTable",
        "TypeName": "Mutation",
        "FieldName": "batchDeleteDocuments",
        "RequestMappingTemplateS3Location": {
            "Fn::Sub": [
                "s3://${S3DeploymentBucket}/${S3DeploymentRootKey}/resolvers/Mutation.batchDeleteDocuments.req.vtl",
                {
                    "S3DeploymentBucket": {
                        "Ref": "S3DeploymentBucket"
                    },
                    "S3DeploymentRootKey": {
                        "Ref": "S3DeploymentRootKey"
                    }
                }
            ]
        },
        "ResponseMappingTemplateS3Location": {
            "Fn::Sub": [
                "s3://${S3DeploymentBucket}/${S3DeploymentRootKey}/resolvers/Mutation.batchDeleteDocuments.res.vtl",
                {
                    "S3DeploymentBucket": {
                        "Ref": "S3DeploymentBucket"
                    },
                    "S3DeploymentRootKey": {
                        "Ref": "S3DeploymentRootKey"
                    }
                }
            ]
        }
    }
}

request:

#set($ids = [])
#foreach($id in ${ctx.args.ids})
  #set($map = {})
  $util.qr($map.put("id", $util.dynamodb.toString($id)))
  $util.qr($ids.add($map))
#end

{
  "version" : "2018-05-29",
  "operation" : "BatchDeleteItem",
  "tables" : {
    "DocumentTable": $util.toJson($ids)
  }
}

response:

$util.toJson($ctx.result)

error:

Is it my mistake or is not supported the BatchDeleteItem operation?

I can see that the actions not allow this operation:

"Action": [
    "dynamodb:BatchGetItem",
    "dynamodb:BatchWriteItem",
    "dynamodb:PutItem",
    "dynamodb:DeleteItem",
    "dynamodb:GetItem",
    "dynamodb:Scan",
    "dynamodb:Query",
    "dynamodb:UpdateItem"
],

How can support be added to this need?

Thanks!

[iparrabb]

I found my mistake thanks to the issue #1079, instead of:

#set($ids = [])
#foreach($id in ${ctx.args.ids})
  #set($map = {})
  $util.qr($map.put("id", $util.dynamodb.toString($id)))
  $util.qr($ids.add($map))
#end

{
  "version" : "2018-05-29",
  "operation" : "BatchDeleteItem",
  "tables" : {
    "DocumentTable": $util.toJson($ids)
  }
}

must be:

#set($ids = [])
#foreach($id in ${ctx.args.ids})
  #set($map = {})
  $util.qr($map.put("id", $util.dynamodb.toString($id)))
  $util.qr($ids.add($map))
#end

{
  "version" : "2018-05-29",
  "operation" : "BatchDeleteItem",
  "tables" : {
    "Document-irlvgawxhbekzpuxpzjwg4o57y-dev": $util.toJson($ids)
  }
}

It is confusing :(, the TableName really is DocumentTable, at least in AppSync, but on DynamoDB the TableName is Document-irlvgawxhbekzpuxpzjwg4o57y-dev, that's how it works.

[SwaySway]

Yea the issue the resolver needing the exact name of the table listed in dynamodb, though we are looking at some ways can address this.

[artecoop]

I tried to replicate this exact same behavior, but using the mock api. The code compiles but executing it does nothing. Is an expected behavior for local db for mocking?

[kldeb]

@SwaySway is there a way to address having the exact table name in the batch resolver?

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