Amazon Lex and DynamodDB - can't update existing item - amazon-web-services

Question

I'm trying to get a specific item from a table.
My DynamoDB table name is table and I have:
Name PK | Number<br/>
S: Juan | S: #####
When I try to run in Lambda I don't get any Item when it really exist one with that name... any idea why it's like that?
AWS = require("aws-sdk"),
DDB = new AWS.DynamoDB({
region: "REGION",
}),
lookup_name_str = name //From Intent variable,
params = {
TableName: "table",
KeyConditionExpression: "name = :v1",
ExpressionAttributeValues: {
":v1":{
"S": lookup_name_str
}
},
FilterExpression: 'contains(nomColaborador,:v1)',
ProjectionExpression: "Number"
};
console.log(params);
var docClient = new AWS.DynamoDB.DocumentClient();
docClient.scan(params, function(err, data){
if(err){
throw err;
}
if(data.Items && data.Items[0] && data.Items[0].Number){
console.log("There is a Name with that number");
console.log(data.Items[0]);
my_response.statusCode = 200;
my_response.body = {
"sessionAttributes": {
"extension_str": data.Items[0].Number.S,
"nomColaborador": event.currentIntent.slots.Name
},
"dialogAction":{
"type": "Close",
"fulfillmentState": "Fulfilled",
"message": {
"contentType": "PlainText",
"content": data.Items[0].Number.S
}
}
};

Answer 1

The main problem here is that you are doing a scan. KeyConditionExpression isn't a parameter of a scan request. If you are requesting a single item by key you want to use getItem. If you need to query data by partition key and an optional sort key you should use query.
With that all said, when you do a scan, or put a filter on a query, you really need to be sure to page through the data. You will often find that you'll get a response with no data, but a paging key to make another call.