How do I initialize PutItemInput struct using aws sdk go v2 to execute a PutItem on DynamoDb without this error?

Question

When I try to initialize the input variable to do a PutItem on DynamoDB table using aws go sdk v2, it gives me an error - missing type in composite literal. I looked at the struct PutItemInput here - https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/[email protected]#PutItemInput I don't understand how to get rid of this error? id is the partition key in mytable

input := &dynamodb.PutItemInput{
            TableName: aws.String("mytable"),
            Item: map[string]types.AttributeValue{
                "id": {
                    N: aws.String(a.ID),
                },
            },
        }

Answer 1

Item: map[string]types.AttributeValue{
    "id": &types.AttributeValueMemberN{a.ID},
}

types.AttributeValue is an interface type. When constructing maps or slices of interfaces you cannot elide the concrete type of the individual elements from the composite literal. You need to tell the compiler what concrete type you would like an element to have.

Answer 2

AWS SDK Go V2

type aStruct struct {
Id int64
Name string
}

var a = aStruct {
Id: 123
Name: "DummyName"
}

itemMap := map[string]types.AttributeValue{
"Id": &types.AttributeValueMemberN{Value: strconv.Itoa(int(a.Id))},
"Name": &types.AttributeValueMemberS{Value: a.Name},
}

itemInput := &dynamodb.PutItemInput{
Item: itemMap,
TableName: aws.String("mytable"),
}

Answer 3

The types.AttributeValue is an interface.It should be something as follows

input := &dynamodb.PutItemInput{
        TableName: aws.String("mytable"),
        Item: map[string]*types.AttributeValue{
            "id": {
                N: aws.String(a.ID),
            },
        },
    }