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The wise MongoDB API

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README.md

monk

build status

Monk is a tiny layer that provides simple yet substantial usability improvements for MongoDB usage within Node.JS.

var db = require('monk')('localhost/mydb')
  , users = db.get('users')

users.index('name last');
users.insert({ name: 'Tobi', bigdata: {} });
users.find({ name: 'Loki' }, '-bigdata', function () {
  // exclude bigdata field
});

Features

  • Command buffering. You can start querying right away.
  • Promises built-in for all queries. Easy interoperability with modules.
  • Easy connections / configuration
  • Well-designed signatures
  • Improvements to the MongoDB APIs (eg: findAndModify supports the update signature style)
  • Auto-casting of _id in queries
  • Builds on top of mongoskin
  • Allows to set global options or collection-level options for queries. (eg: safe is true by default for all queries)

How to use

Connecting

Single server

var db = require('monk')('localhost/mydb')

Replica set

var db = require('monk')('localhost/mydb,192.168.1.1')

Collections

Getting one

var users = db.get('users')
// users.insert(), users.update() … (see below)

Dropping

users.drop(fn);

Signatures

  • All commands accept the simple data[, …], fn. For example
    • find({}, fn)
    • findOne({}, fn)
    • update({}, {}, fn) findAndModify({}, {}, fn)
    • findById('id', fn)
  • You can pass options in the middle: data[, …], options, fn
  • You can pass fields to select as an array: data[, …], ['field', …], fn
  • You can pass fields as a string delimited by spaces: data[, …], 'field1 field2', fn
  • To exclude a field, prefix the field name with '-': data[, …], '-field1', fn

Promises

All methods that perform an async action return a promise.

var promise = users.insert({});
promise.type; // 'insert' in this case
promise.error(function(err){});
promise.on('error', function(err){});
promise.on('success', function(doc){});
promise.on('complete', function(err, doc){});
promise.success(function(doc){});

Indexes

users.index('name.first', fn);
users.index('email', { unique: true }); // unique
users.index('name.first name.last') // compound
users.index({ 'email': 1, 'password': -1 }); // compound with sort
users.index('email', { sparse: true }, fn); // with options
users.indexes(fn); // get indexes
users.dropIndex(name, fn); // drop an index
users.dropIndexes(fn); // drop all indexes

Inserting

users.insert({ a: 'b' }, function (err, doc) {
  if (err) throw err;
});

Casting

To cast to ObjectId:

users.id() // returns new generated ObjectID
users.id('hexstring') // returns ObjectId
users.id(obj) // returns ObjectId

Updating

users.update({}, {}, fn);
users.updateById('id', {}, fn);

Finding

Many

users.find({}, function (err, docs){});

By ID

users.findById('hex representation', function(err, doc){});
users.findById(oid, function(err, doc){});

Single doc

findOne also provides the findById functionality.

users.findOne({ name: 'test' }).on('success', function (doc) {});

And modify

users.findAndModify({ query: {}, update: {} });
users.findAndModify({ _id: '' }, { $set: {} });

Streaming

Note: stream: true is optional if you register an each handler in the same tick. In the following example I just include it for extra clarity.

users.find({}, { stream: true })
  .each(function(doc){})
  .error(function(err){})
  .success(function(){});
Destroying a cursor

On the returned promise you can call destroy(). Upon the cursor closing the success event will be emitted.

Global options

var db = require('monk')('localhost/mydb')
db.options.multi = true; // global multi-doc update
db.get('users').options.multi = false; // collection-level

Monk sets safe to true by default.

Query debugging

If you wish to see what queries monk passes to the driver, simply leverage debug:

DEBUG="monk:queries"

To see all debugging output:

DEBUG="monk:*"

License

(The MIT License)

Copyright (c) 2012 Guillermo Rauch <guillermo@learnboost.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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