How to initialize Mongodb with data?

Question

MongoDB

I set the initial data for a DB a trace. way:

const ModTpl = require('../models/mod_tpl');
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/testdb', { useMongoClient: true });

//Здесь набор самих данных
const data = [ ... ];

let done = 0;

for (let i = 0; i < data.length; i++) {
  data[i].save(function(err, result) {
//    if (err) {
//      console.log(i, err);
//      mongoose.disconnect();
//      return;
//    }

    done++;
    if (done === data.length) {
      exit();
    }
  });
}

function exit() {
  mongoose.disconnect();
}

There are about 50,000 elements in the array, the data is homogeneous. Initialization is started from the terminal with the node initdata.js command.
As a result, a different number of elements is added to the database all the time - from 18000 to 25000. No errors are displayed.
How to ensure that all elements are added to the database?

Answer 1

I would use async lib something like this:

const async = reuire('async');

let queue = async.queue(function(task, callback) {
    task.save(callback);
}, 10);

queue.drain = function() {
    exit();
};

for (let i = 0; i < data.length; i++) {
  queue.push(data[i]);
}