DynamoDB does not have the option to automatically generate a unique key for you.
In examples I see people creating a uid out of a combination of fields, but is there a way to create a unique ID for data which does not have any combination of values that can act as a unique identifier? My questions is specifically aimed at lambda functions.
One option I see is to create a uuid based on the timestamp with a counter at the end, insert it (or check if it exists) and in case of duplication retry with an increment until success. But, this would mean that I could potentially run over the execution time limit of the lambda function without creating an entry.
If you are using Node.js 8.x, you can use uuid module.
var AWS = require('aws-sdk'),
uuid = require('uuid'),
documentClient = new AWS.DynamoDB.DocumentClient();
[...]
Item:{
"id":uuid.v1(),
"Name":"MyName"
},
If you are using Node.js 10.x, you can use awsRequestId without uuid module.
var AWS = require('aws-sdk'),
documentClient = new AWS.DynamoDB.DocumentClient();
[...]
Item:{
"id":context.awsRequestId,
"Name":"MyName"
},