About

nicedataloader is designed as a wrapper for dataloader. It will help pass parameters to graphQL resolver when using dataloader.

example

resolvers.js

const NiceDataLoader = require('nicedataloader').NiceDataLoader;
const pricesLoader = new NiceDataLoader(productResolver.getPrices);

const resolvers = {
    Query: {
        Products: (obj, args, context, info) 
                => productResolver.getProducts( args, context, info),
    },
    Products: {
        Prices: (parent, args, context, info) 
                    => pricesLoader.get(parent.id, args, context, info),
    .
    .
    .
    
    

ProductResolver.js

const getPrices = async (keys, args, context, info) => {
    const mysqlPool = context.mysqlPool;
    const customerType = args.customerType;
    return new Promise((resolve, reject) => {
        productModel.getPrices(mysqlPool, keys, customerType).then((result) => {
        resolve(result);
    }).catch((error) => {
        reject(error);
    });
};

API

| function | description | example | | :------------- | :----------: | :----------: | | constructor(_function, cache = false) | Pass resolver function and set Dataloader cache | | | get(key, args, context, info) | Pass key, args, context, info to resolver returns results from resolver | | | clear() | performs clearAll(), on the dataloader, and sets parameters to null | |