How to use the ReadPreference function from mongodb

ReadPreference.js

GitHub: rain1017/memdb

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/*!
 * Module dependencies.
 */

var mongodb = require('mongodb');
var ReadPref = mongodb.ReadPreference;

/*!
 * Converts arguments to ReadPrefs the driver
 * can understand.

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+ 3 other calls in file

MongoStorageAdapter.js

GitHub: praveenkutti1990/parse-server-direct

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import logger from '../../../logger';


// @flow-disable-next
const mongodb = require('mongodb');
const MongoClient = mongodb.MongoClient;
const ReadPreference = mongodb.ReadPreference;


const MongoSchemaCollectionName = '_SCHEMA';


const storageAdapterAllCollections = mongoAdapter => {

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