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@via-profit-services/dataloader

Via Profit / dataloader

Table of Contents

• Overview
• Installation
• Getting Started
• API

Overview

This module is a fork of the package GraphQL DataLoader with some changes to allow the use of Redis cache with the ability to specify the expiration time of each of its elements.

Installation

We used IO Redis package as Redis client. You must install this dependency to.

# yarn
yarn add @via-profit-services/dataloader ioredis

# npm
npm i @via-profit-services/dataloader ioredis

Getting Started

Setup Reids using ioredis and pass it to constructor.

import DataLoader from '@via-profit-services/dataloader';
import Redis from 'ioredis';

const redis = new Redis();
const loader = new DataLoader({
  // ioredis instance
  redis,

  // Each dataloader creates its own cache in Redis.
  // Therefore, the `cacheName` must be a unique key in Redis.
  // It is better to use a meaningful name for the `cacheName`
  cacheName: 'books',

  // Default value of expiration time of each value placed in the cache
  // It will be used in cases of calling 'load` without the expires argument.
  // Format: digit + entity
  defaultExpiration: '12 hours',
});

// Now you can start the load your data
loader.load('fde7fcf7-984d-44b8-8504-d6347e105f56');
loader.load('34bcab6b-7207-4883-a442-92d21e53d31d');
loader.loadMany(['e3fd7057-858b-43f9-b276-0c631e0de1af', 'ba995e24-0d05-4de4-a12c-756c009f3620']);

API

Use TypeScript for more data abot API and arguments

Name	Arguments	Return type	Description
load	key: string, [expires: string | number]	Promise<T|null>	Loads one entity by key
reload	key: string, [expires: string | number]	Promise<T|null>	Loads one entity by key and ignore cache, but put loaded data into the cache
reloadMany	keys: string[], [expires: string | number]	Promise<T[]>	Loads one or more entities by keys and ignore cache, but put loaded data into the cache
loadMany	keys: string[], [expires: string | number]	Promise<T[]>	Loads one ore more entities
clear	key: string	Promise<this>	Clear one entity by key
clearMany	keys: string[]	Promise<this>	Clear one ore more entities
clearAll	-	Promise<this>	Clear all entities
prime	value: T, [expires: string | number]	Promise<this>	Put data to dataloader cache
primeMany	values: T[], [expires: string | number]	Promise<this>	Put more then one data to dataloader cache