KDC DDB

A lightweight object modeling for DynamoDB inspired by Mongoose.

The default database operations of this package assumes single table design but all can be overridden by writing your own.

Installation

npm i @kdcsoftware/ddb

Quick Start

1. Define database table name in environment variable.

   In code:

   process.env.DDB_TABLE = 'my-dynamodb-table';

   or in serverless.yml:

   provider:
     environment:
       DDB_TABLE: 'my-dynamodb-table'

   or in package.json:

   "scripts": {
      "start": "DDB_TABLE='my-dynamodb-table' node index.js"
   }

   Note that table creation needs to be done outside this package to allow flexibility.

2. Define the fields of the document.

   const fields = {
     id: { required: true },
     name: { required: true },
     type: { required: true },
   };

3. Define primary and secondary keys

   const pKey = { pk: '{type}#{id}', sk: 'ANIMAL#{type}' };
   const sKey = { pk2: 'ANIMAL', sk2: '{type}#{id}' };

4. Create schema

   const schema = new DDB.Schema(fields, pKey, sKey);

5. Create class

   const Animal = DDB.model('Animal', schema);

6. Create an instance document from data object

   const dog = new Animal({ id: 1, name: 'sparkle', type: 'dog' });
   await dog.save();

7. Check the tests folder for more examples.

Debugging

This package uses debug.

To enable:

DEBUG=ddb:* node app.js