DynamoDB Datamapper error throws item did not adhere to the DynamoDBTable protocol

Question

Not really sure where my error is here, Im using the AWS DynamoDb mapper function in node.js but I get this error:

The provided item did not adhere to the DynamoDbTable protocol. No string property was found at the DynamoDbTable symbol I followed the tutorial they provide, I made some changes so I can use cjs but can't seem to find the issue.

const {
  DynamoDBSchema,
  DynamoDBTable,
  embed
} = require("@aws/dynamodb-data-mapper");
const v4 = require("uuid/v4");
class Invoice {}

Object.defineProperties(Invoice.prototype, {
  DynamoDBTable: {
    value: 'invoices'
  },
  [DynamoDBSchema]: {
    value: {
      id: {
        type: "String",
        keyType: "HASH",
        defaultProvier: v4
      },

      invoiceId: {type:'String'},
      firstname:{type:'String'},
      lastname:{type:'String'},
      email:{type:'String'},
      items:{type:'List',memberType:{type:'Map'}},
      tax:{type:'String'},
      total:{type:'String'},
      paymentStatus:{type:'String'},
      paymentType:{type:'String'},
      paymentInfo:{type:'List',memberType:{type:'Map'}}

    }
    
  }
});
   module.exports = Invoice;

const AWS = require("aws-sdk");
const {DataMapper} = require('@aws/dynamodb-data-mapper');
const Invoice= require('../models/invoices.model');

const ddb = new AWS.DynamoDB({
  region: "us-east-1",
  endpoint: "http://localhost:1948"
});
const ddbDoc = new AWS.DynamoDB.DocumentClient({
  region: "us-east-1",
  endpoint: "http://localhost:1948"
})

const mapper = new DataMapper({
  client: new AWS.DynamoDB({region: "us-east-1",
  endpoint: "http://localhost:1948"})
})

let data = new Invoice();


//mapper.put({data}).then(console.log).catch(console.log)
async function getItems(){
  for await( const foo of mapper.scan(data,{indexName:'Invoiceid-Email'}) ){
    console.log(foo)
  }
}
getItems().then(console.log).catch(console.log);

Answer 1

You'll need to put DynamoDBTable inside square brackets similar to DynamoDBSchema.

Answer 2

If you're using Typescript, you have to new up the model.

@table('myTable')
export class MyModel {
  constructor(model?: Partial<MyModel>) {
    if (model) {
      Object.assign(this, model);
    }
  }

  @hashKey()
  pk: string;

  name: string;
}

// This won't work
const wontWork: MyModel = { pk: 'Cust#1', name: 'John' };

// You have to do this
const willWork = new MyModel();
willWork.pk = 'Cust#1';
willWork.name = 'John';

// This will also work
const willAlsoWork = new MyModel({ pk: 'Cust#1', name: 'John' });