API Gateway and DynamoDB PutItem for String Set

Question

I can't seem to find how to correctly call PutItem for a StringSet in DynamoDB through API Gateway. If I call it like I would for a List of Maps, then I get objects returned. Example data is below.

{
    "eventId": "Lorem",
    "eventName": "Lorem",
    "companies": [
        {
            "companyId": "Lorem",
            "companyName": "Lorem"
        }
    ],
    "eventTags": [
        "Lorem",
        "Lorem"
    ]
}

And my example template call for companies:

"companies" : {
     "L": [
          #foreach($elem in $inputRoot.companies) {
            "M": {
              "companyId": {
                "S": "$elem.companyId"
              },
              "companyName": {
                "S": "$elem.companyName"
              }
            }
        } #if($foreach.hasNext),#end
        #end
     ]
}

I've tried to call it with String Set listed, but it errors out still and tells me that "Start of structure or map found where not expected" or that serialization failed.

"eventTags" : {
      "SS": [
        #foreach($elem in $inputRoot.eventTags) {
           "S":"$elem"
        } #if($foreach.hasNext),#end
        #end
      ]
    }

What is the proper way to call PutItem for converting an array of strings to a String Set?

I'm doing this directly through the body template in API gateway. I'm just specifying a format of application/json. — user3342237
– user3342237, Commented Jun 12, 2017 at 22:09

notionquest · Accepted Answer · 2017-06-12 20:20:00Z

1

If you are using JavaScript AWS SDK, you can use document client API (docClient.createSet) to store the SET data type.

docClient.createSet - converts the array into SET data type

var docClient = new AWS.DynamoDB.DocumentClient();   

     var params = {
    TableName:table,
    Item:{
        "yearkey": year,
        "title": title       
        "product" : docClient.createSet(['milk','veg'])        
    }
};

answered Jun 12, 2017 at 20:20

notionquest

39.4k6 gold badges120 silver badges111 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user3342237 Over a year ago

I ended up going this route and using the JavaScript SDK in Lambda instead. Thanks!

Collectives™ on Stack Overflow

API Gateway and DynamoDB PutItem for String Set

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related