Dynamo Record

This package aims to provide a “humanized" and more readable support of DynamoDB DocumentClient.

Getting started

Installation

$ npm install dynamo-record --save

OR

$ yarn add dynamo-record

Import & initialization

// assumes AWS.config is set up already
import { DynamoRecord } from "dynamo-record";

const repo = new DynamoRecord<DataType, WhereType>(tableName, config, tracing);

• tableName string the table name
• config Dynamo Client Configuration The AWS DynamoDB configuration object
• tracing optional - boolean enable or disable AWS X-Ray tracing feature. Default is false.

Key concept

The library generates the DynamoDB config for you.

In some cases where a method will not allow you to accomplish what you would like, each method has an optional params config where you can override each DocumentClient basic params. API documentation specify which basic method from DocumentClient is extended.

In Dynamo Record, all params for config are camelize (fooBar) key instead of pascalize (FooBar).

API

The following methods are available. All DocumentClient methods are not already implemented

find

Return a single element based on his primary key

repo.find(primaryKey, config);

Extend: get()

Parameters

• primaryKey object with hash and range key. Provided keys must match dynamoDB schema.
• config optional - object with DocumentClient params.

where

Return all items that match primary key and/or condition

repo.where(primaryKey, filterExpression, config);

Extend: query() scan()

Parameters

• primaryKey optional - object with hash and range key. Provided keys must match dynamoDB schema.
• filterExpression optional - object with required condition and keys property.
• config optional - object with DocumentClient params.

getAll

Return all items

repo.getAll(config);

Extend: scan()

Parameters

• config optional - object with DocumentClient params.

create

Add a new item

repo.create(createData, config);

Extend: put()

Parameters

• createData object with data to add into table.
• config optional - object with DocumentClient params.

batchCreate

Add an array of items

repo.batchCreate(createData, config);

Extend: batchWrite()

Parameters

• createData array of items to add into table.
• config optional - object with DocumentClient params.

update

Update an item based on his primary key

repo.update(primaryKey, updateData, config);

Extend: update()

Parameters

• primaryKey object with hash and range key. Provided keys must match dynamoDB schema.
• updateData object with item data to update.
• config optional - object with DocumentClient params.

deepUpdate

Only update object endpoint values based on his primary key

The updated object must have a full existing tree of all nested object before the update. DynamoDB can't update a property and create it's parent object on the same request.

If user wants to update a whole object without knowing the nested content, he can pass a custom config through updateExpression, expressionAttributeNames and expressionAttributeValues.

repo.deepUpdate(primaryKey, updateData, config);

Extend: update()

Parameters

• primaryKey object with hash and range key. Provided keys must match dynamoDB schema.
• updateData object with item data to update.
• config optional - object with DocumentClient params.

destroy

Remove an item

repo.delete(primaryKey, config);

Extend: delete()

Parameters

• primaryKey object with hash and range key. Provided keys must match dynamoDB schema.
• config optional - object with DocumentClient params.