How can I store an array into dynamoDB table

Question

I have the following struct:

type User struct {
  ID       string    `json:"id"`
  Name     string    `json:"name"`
  LastName string    `json:"lastName"`
  User     string    `json:"user"`
  Password string    `json:"password"`
  Vehicles []Vehicle `json:"vehicles"`
}
type Vehicle struct {
  Plate string `json:"plate"`
}

I want to store an array of Vehicles in my DynamoDB. I did some research and I found that I should use the following code:

input := &dynamodb.PutItemInput{
    TableName: aws.String(tableUsers),
    Item: map[string]*dynamodb.AttributeValue{
        "id": {
            S: aws.String(fmt.Sprintf("%v", uuid)),
        },
        "name": {
            S: aws.String(user.Name),
        },
        "lastName": {
            S: aws.String(user.LastName),
        },
        "user": {
            S: aws.String(user.User),
        },
        "password": {
            S: aws.String(user.Password),
        },
        "vehicles": {
            L: [{
                M: {
                    "plate": {S: aws.String("test")},
                },
            }],
        },
    },
}

But I keep having a syntax error in:

L: [{
    M: {
        "plate": {S: aws.String("test")},
    },
}],

What am I doing wrong?

alexandrevilain · Accepted Answer · 2020-03-09 14:40:12Z

6

If you look at the dynamodb's godoc: https://docs.aws.amazon.com/sdk-for-go/api/service/dynamodb/#AttributeValue

You can see that the field L has the following type: []*AttributeValue

When you create a slice litteral you should specify its type. So for you case it's:

L: []*dynamodb.AttributeValue{
  {
    M: map[string]*dynamodb.AttributeValue{
      "plate": {S: aws.String("test")}
    }
  }
}

If you want to better understand struct, slices and map your can read the following articles:

edited Mar 9, 2020 at 14:40

answered Mar 7, 2020 at 19:46

alexandrevilain

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