Example on how to user personId as primary key in an Alexa Persistence adapter

index.js

function getPersistenceAdapter() {
    // This function is an indirect way to detect if this is part of an Alexa-Hosted skill
    function isAlexaHosted() {
        return !!process.env.S3_PERSISTENCE_BUCKET;
        
    if (isAlexaHosted()) {
        const {S3PersistenceAdapter} = require('ask-sdk-s3-persistence-adapter');
        return new S3PersistenceAdapter({
            bucketName: process.env.S3_PERSISTENCE_BUCKET,
            objectKeyGenerator: keyGenerator
        });
    } else {
        // IMPORTANT: don't forget to give DynamoDB access to the role you're using to run this lambda (via IAM policy)
        const {DynamoDbPersistenceAdapter} = require('ask-sdk-dynamodb-persistence-adapter');
        return new DynamoDbPersistenceAdapter({
            tableName: 'person_db',
            createTable: true,
            partitionKeyGenerator: keyGenerator
        });
    }
}

// This function establishes the primary key of the database as the skill id (hence you get global persistence, not per user id)
function keyGenerator(requestEnvelope) {
    if (requestEnvelope.context.System.person
        && requestEnvelope.context.System.person.personId) {
      return requestEnvelope.context.System.person.personId; 
    } else {
      return requestEnvelope.context.System.user.userId; 
    }
}

// don't forget to pass to skill builder the persistentes adapter -> .withPersistenceAdapter(persistenceAdapter)

package.json

{
    "name": "persons_table",
    "version": "0.4.0",
    "description": "happy birthday skill",
    "main": "index.js",
    "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1"
    },
    "author": "Amazon Alexa",
    "dependencies": {
        "ask-sdk-core": "^2.7.0",
        "ask-sdk-model": "^1.18.0",
        "i18next": "^15.0.5",
        "ask-sdk-s3-persistence-adapter": "^2.7.0",
        "ask-sdk-dynamodb-persistence-adapter": "^2.7.0",
        "moment-timezone": "^0.5.23"
    }
}