How to clone or copy mongodb collection through javascript command not from cmd

Question

As I know how to clone the MongoDB collection by typing the command on cmd. As I want to do clone through javascript which will be running through cron job on nodejs environment.

Like on my app.js file I am calling the file like this
var Message = require('./models/copymessage');

what I would like is like this

var CopyCollection = new CronJob('00 36 17 * * *', function() {
    //Some command which can copy the collection.
    //I am using MongoDB 3.0+ version
}, null, true, 'Asia/Kolkata');

Any help is appreciated

Bartlomiej Nogas · Accepted Answer · 2018-01-05 15:06:29Z

3

I assume that you want to copy a collection within the same MongoDB instance

There is an implementation that I use. You can skip the lines with indexes if you don't want to copy it.

function copyCollection(from, to) {
    db.getCollection(from).aggregate([ { $out: to } ])
    db.getCollection(from).getIndexes().forEach(function(inx) {
         db.getCollection(to).createIndex(inx.key);
    })
    var newCollectionDocuments = db.getCollection(to).count()
    var newCollectionIndexes = db.getCollection(to).getIndexes()
    print("Document inserted: " + newCollectionDocuments)
    print("Indexes: " + tojson(newCollectionIndexes))
}

edited Jan 5, 2018 at 15:06

answered Jan 5, 2018 at 15:00

Bartlomiej Nogas

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