dynamoDb put item not populating all params - go

Question

I have 2 lambdas that do the exact same thing, however, they are both written using different langages.
1st lambda - runs on a node.js environment, when I create my arguments to putItem, as follows:
const args = {
id: "my id",
__typename: "a type name",
_version: 1,
_lastChangedAt: now.toISOString(),
createdAt: now.toISOString(),
updatedAt: fields.LastModifiedDate
}
var recParams = {
TableName: dynamoTable,
Key: {
"id": Id
},
Item: args,
ReturnValues: "ALL_OLD"
};
and then I use the docClient to insert the row. Everything works fine, all the properties are populated in my dynamo row.
I have the exact same written in Golang:
item := RecentItem{
Id: "some Id",
_version: 1,
__typename: "a type name",
_lastChangedAt: currentTime.UTC().Format("2006-01-02T15:04:05-0700"),
createdAt: currentTime.UTC().Format("2006-01-02T15:04:05-0700"),
updatedAt: currentTime.UTC().Format("2006-01-02T15:04:05-0700"),
}
av, err := dynamodbattribute.MarshalMap(item)
input := &dynamodb.PutItemInput{
Item: av,
TableName: aws.String(tableName),
}
Everything ALMOST works, the item is inserted, but I am missing all the properties except for the id.
Structure declaration :
type RecentItem struct {
Id string `json:"id"`
_version int `json:"_version"`
_lastChangedAt string `json:"_lastChangedAt"`
createdAt string `json:"createdAt"`
updatedAt string `json:"updatedAt"`
}
Not sure why in Go my dynamoDb row is missing properties. Am I missing something?

Answer 1

Properties other than Id must be exported, i.e, started with an Upper case:
type RecentItem struct {
ID string `dynamodbav:"id"`
Version int `dynamodbav:"_version"`
LastChangedAt string `dynamodbav:"_lastChangedAt"`
CreatedAt string `dynamodbav:"createdAt"`
UpdatedAt string `dynamodbav:"updatedAt"`
}