mongo-bulk

Lightweight wrapper around mongodb's bulkWrite method.

Purpose

MongoDB does not support self-reference during write/update operations. Updating large datasets with references requires at least three steps:

1. Fetch matching documents
2. Map documents to update
3. Pass updates to bulkWrite API

Furthermore, when dealing with very large datasets, concurrency/memory must be monitored and throttled to avoid running out of memory.

With mongo-bulk, this can be reduced to a single operation.

Usage

mongo-bulk supplies the following imports

import bulkWrite, { bulkDelete, bulkInsert, bulkReplace, bulkUpdate } from 'mongo-bulk'

Each of these methods require the following props:

• collection: a collection name string, or a valid mongodb Collection instance (required)
• db: a mongo url, or a valid mongodb Db instance (required if collection is a string)
• document: an object to be passed in to the bulk operation, or a function that returns an object (required)
  • for 'insert' operations the function will receive the current index as its argument
  • for 'update' and 'replace' operations the function will recieve the old document as its argument
• filter: a query object specifying which documents to run the bulk operations against (default is all documents)
• type: the type of bulk operation to run (only required if using bulkWrite)

The following props are optional:

• concurrency: desired number of concurrent operations (default is 1000)
• count: the number of documents to insert (required for bulkInsert, default is 1)
• operations: a pre-built array of operations (Note: with this, the document option is not required)
• options: an options object to be passed to mongodb's bulkWrite

Each method returns a promise, which resolves to a BulkWrite result.

Examples

Insert

import { bulkInsert } from 'mongo-bulk';

return bulkInsert({
  collection: '...collectionName...',
  db: '...mongoUrl...',
  count: 1000000,
  document: currentIndex => ({
    property: currentIndex
  }),
});

Update

import { bulkUpdate } from 'mongo-bulk';

return bulkUpdate({
  collection: '...collectionName...',
  db: '...mongoUrl...',
  filter: {},
  document: oldDoc => ({
    $set: {
      newProperty: oldDoc.property * 2,
    }
  }),
});

Installation

$ npm install mongo-bulk

Tests

$ npm test

License

Copyright (c) 2017

Licensed under the MIT license.