Create item in dynamodb using go - amazon-web-services

Question

I'm using the follow code to create a item in my dynamodb table:
package main
import (
"fmt"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/endpoints"
"github.com/aws/aws-sdk-go-v2/aws/external"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/dynamodbattribute"
)
type Record struct {
ID string
URLs []string
}
// Using the SDK's default configuration, loading additional config
// and credentials values from the environment variables, shared
// credentials, and shared configuration files
var cfg, err = external.LoadDefaultAWSConfig()
func createNewExtraction() error {
svc := dynamodb.New(cfg)
r := Record{
ID: "ABC123",
URLs: []string{
"https://example.com/first/link",
"https://example.com/second/url",
},
}
item, err := dynamodbattribute.MarshalMap(r)
if err != nil {
panic(fmt.Sprintf("failed to DynamoDB marshal Record, %v", err))
}
req := svc.PutItemRequest(&dynamodb.PutItemInput{
TableName: aws.String("test"), Item: item })
_, err = req.Send(); if err != nil {
return err
}
return nil
}
func main() {
if len(cfg.Region) > 0 {
// Set Region to us-east-1 as default.
cfg.Region = endpoints.UsEast1RegionID
}
err = createNewExtraction(); if err != nil {
panic(err.Error())
}
}
But it's returning the error:
panic: ValidationException: One or more parameter values were invalid: Missing the key id in the item
status code: 400, request id: F3VCQSGRIG5GM5PEJE7T5M4CEVVV4KQNSO5AEMVJF66Q9ASUAAJG
goroutine 1 [running]:
main.main()
/Users/user/go/src/Test2/test.go:56 +0x102
exit status 2
I already tried to declare Id, id and ID in my Record struct, but it doesn't work.
The stranger is: I got this code in the official documentation (I'm updating to work with the aws-sdk-go-v2).
Thank you in advance.

Answer 1

I do not know golang, but I had similar problems in nodejs.
Make sure the item you put in the table contains the 'partition key' and the sorting key, case-sensitive.
EDIT:
• It is a golang issue, the item is not built properly when the DynamoDB column names are lowercase.
• Consider redefining the Record structure (see this link for details):
type Record struct{
ID string `json:"id"`
URLs []string `json:"url"`
}
where id and url are column names in DynamoDB table.