How to pass variable key value in dynamodb - amazon-dynamodb

Question

Am trying to get the items from DynamoDB table based on the current date. Using the date value in string format when am trying to run the below piece of code, its error out saying:
{
"errorMessage": "ERROR: Dynamo failed: TypeError: Cannot read property 'datatype' of undefined"
}
Below is the piece of code:
exports.handler = function(event, context) {
console.log("Request received:\n", JSON.stringify(event));
console.log("Context received:\n", JSON.stringify(context));
var doc = require('dynamodb-doc');
var dynamodb = new doc.DynamoDB();
var params = {
Key: {
"abc" : datetime1
},
TableName: 'myTable',
ProjectionExpression: 'message'
};
var Message = callback();
var datetiem = new Date().toISOString().split('T')[0];
console.log('date is ', datetiem); // prints 2018-01-09
var datetime1 = JSON.stringify(datetiem);
console.log(datetime1); //prints "2018-01-09"
function callback (message) {
dynamodb.getItem(params, function (err, data) {
if (err) {
context.fail('ERROR: Dynamo failed: ' + err);
} else {
console.log('Dynamo Success: ' + JSON.stringify(data, null, ' '));
console.log('data', data)
let Message = data['Item'].message;
console.log('test',Message);
}
});
}
};
It runs fine if I pass the value directly i.e. "abc" : "2018-01-09"
Can someone please advice?

Answer 1

I'm not sure your datetime1 variable is defined when you use it in parameters. Try this:
exports.handler = function(event, context) {
console.log("Request received:\n", JSON.stringify(event));
console.log("Context received:\n", JSON.stringify(context));
var doc = require('dynamodb-doc');
var dynamodb = new doc.DynamoDB();
var Message = callback();
var datetiem = new Date().toISOString().split('T')[0];
console.log('date is ', datetiem); // prints 2018-01-09
var datetime1 = JSON.stringify(datetiem);
console.log(datetime1); //prints "2018-01-09"
var params = {
Key: {
"abc" : datetime1
},
TableName: 'myTable',
ProjectionExpression: 'message'
};
function callback (message) {
dynamodb.getItem(params, function (err, data) {
if (err) {
context.fail('ERROR: Dynamo failed: ' + err);
} else {
console.log('Dynamo Success: ' + JSON.stringify(data, null, ' '));
console.log('data', data)
let Message = data['Item'].message;
console.log('test',Message);
}
});
}
};