UUIDs for DynamoDB?

Solution 1:

Good question - while conceptually possible, this seems not currently available as a DynamoDB API level feature, insofar neither CreateTable nor PutItem refer to such a functionality.

The @DynamoDBAutoGeneratedKey notation you have noticed is a Java annotation, i.e. syntactic sugar offered by the Java SDK indeed:

An annotation, in the Java computer programming language, is a special form of syntactic metadata that can be added to Java source code.

As such @DynamoDBAutoGeneratedKey is one of the Amazon DynamoDB Annotations offered as part of the Object Persistence Model within the Java SDK's high-level API (see Using the Object Persistence Model with Amazon DynamoDB):

Marks a hash key or range key property as being auto-generated. The Object Persistence Model will generate a random UUID when saving these attributes. Only String properties can be marked as auto-generated keys.

Solution 2:

While working with dynamodb in javascript with nodejs. I use the npm module uuid to genrate unique key.

Ex:

id=uuid.v1();

refer :uuid npm

Solution 3:

By using schema based AWS dynamodb data mapper library in Node.js, Hash key (id) will be generated automatically. Auto generated ids are based on uuid v4.

For more details, have a look on following aws package.

Data Mapper with annotation

Data Mapper package for Javascript

Sample snipet

@table('my_table')
class MyDomainClass {
    @autoGeneratedHashKey()
    id: string;

    @rangeKey({defaultProvider: () => new Date()})
    createdAt: Date;
}