Amazon Lambda writing to DynamoDB

Question

I'm new to dynamoDB and I'm trying to write some data to the table using Lambda. So far I have this:

'AddFood': function () {

    var FoodName = this.event.request.intent.slots.FoodName.value;
    var FoodCalories = this.event.request.intent.slots.FoodCalories.value;
    console.log('FoodName : ' + FoodName);

    const params = {
        TableName: 'Foods',
        Item: {
            'id': {"S": 3},
            'calories': {"S": FoodCalories},
            'food': {"S": FoodName}
            }
    };

    writeDynamoItem(params, myResult=>{
        var say = '';

        say = myResult;

        say = FoodName + ' with ' + FoodCalories + ' calories has been added ';
        this.response.speak(say).listen('try again');
        this.emit(':responseReady');

    });

    function writeDynamoItem(params, callback) {

        var AWS = require('aws-sdk');
        AWS.config.update({region: AWSregion});

        var docClient = new AWS.DynamoDB();

        console.log('writing item to DynamoDB table');

        docClient.putItem(params, function (err, data) {
            if (err) {
                callback(err, null)
            } else {
               callback(null, data)
            }
        });
    }
}

Does anyone know why the data is not appearing in the database? I have checked the IAM and the policy is set to AmazonDynamoDBFullAccess.

Answer 1

After making a few changes to the write function, the following code allowed me to write items to the database:

function writeDynamoItem(params, callback) {

const AWS = require('aws-sdk');
AWS.config.update({region: AWSregion});

const docClient = new AWS.DynamoDB.DocumentClient({region: 'eu-west-1'});

console.log('writing item to DynamoDB table');

docClient.put(params, function (err, data) {
    if (err) {
        callback(err, null)
         console.error("Unable to write item. Error JSON:", JSON.stringify(err, null, 2))
    } else {
       callback(null, data)
    }
});

}