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mongolocal

Mongo Local

Stripped-down version of MongoDB module that operates on a collection stored in memory. Doc matching and updating is done using the fauxmongo module.

Collections can be stored in an array, or an object with keys in the object corresponding to the doc's ID.

NOTE: This project is not affiliated with MongoDB

Changelog

Version 1.2.10

  • Fixed bug in cursor's hasNext function

Version 1.2.9

  • Added option to generate _id using external function

Version 1.2.8

  • Added hasNext function to cursor

Version 1.2.7

  • Fixed bug that caused cursor to skip when removing items from array-based collection

Version 1.2.6

  • Fixed bug in upsert that prevented callback from being triggered

Version 1.2.5

  • Fixed bug in remove function that triggered emitter before deletion was complete

Version 1.2.4

  • Fixed bug in capped insert function

Version 1.2.3

  • Made docsLinkedList attribute public, made docsLinkedList's list attribute public
  • Added tests to test sending arbitrary tags through options argument of insert/update/remove

Version 1.2.2

  • Fixed bug in cursor's forEach function

Version 1.2.1

  • Find now returns cursor, in addition to accepting callback

Previous versions

Docs on Github

Installation

Bower

bower install

Node

npm install

Usage

Initialize

Mongolocal sets up the collection

var mongolocal = require('mongolocal');
var collection = mongolocal();

Pass in an array

var mongolocal = require('mongolocal');
var extCollection = [];
var collection = mongolocal({
	collection: extCollection
});

Pass in an object

var mongolocal = require('mongolocal');
var extCollection = {};
var collection = mongolocal({
	collection: extCollection
});

Capped collection

var mongolocal = require('mongolocal');
var collection = mongolocal({
	max: 1000
});

Specify a function to generate _id

var maxId = 0;
function generateId() {
	maxId++;
	return maxId;
}

var mongolocal = require('mongolocal');
var collection = mongolocal({
	objectId: generateId
});

Find documents

var cursor = collection.find({key: "val"});
cursor.toArray(function(error, results) {
	if(error)
		console.error("Something went wrong");
	else {
		results.forEach(function(doc) {
			console.log(doc.key);
		});
	}
});

Insert document

var doc = {key: "val1"};
collection.insert(doc, function (error, writeOp) {
	if(error)
		console.error("Something went wrong");
	else
		console.log("Document inserted with ID", doc._id);
});

Update document

var doc = {key: "someval1"};
collection.insert(doc, function (error, writeOp) {
	if(error)
		console.error("Something went wrong on insertion");
	else {
		var id = doc._id;
		collection.update({_id: id}, {key: "val2"}, function(error, success) {
			if(error)
				console.error("Something went wrong on update");
			else
				console.log("Update succeeded");
		}
	}
});

Remove document

var doc = {key: "someval1"};
collection.insert(doc, function (error, writeOp) {
	if(error)
		console.error("Something went wrong on insertion");
	else {
		var id = doc._id;
		collection.remove(id, function(error, success) {
			if(error)
				console.error("Something went wrong on removal");
			else
				console.log("Removal succeeded");
		}
	}
});

Callbacks

Potentially useful when the collection is managed by some other software (eg: an array in Polymer)

Insert

var mongolocal = require('mongolocal');
var extCollection = []; // collection is a simple array
var collection = mongolocal({
	collection: extCollection,
	insert: function(doc) {
		console.log(doc._id);
		extCollection.push(doc);
	}
});

var doc = {key: "val1"}
collection.insert(doc, function(error, writeResult) {
	if(error)
		throw error;
	else
		console.log(doc._id + "inserted");
});

Update

var mongolocal = require('mongolocal');
var extCollection = []; // collection is a simple array
var collection = mongolocal({
	collection: extCollection,
	update: function(index, updated) {
		collection[index] = updated;
	}
});

var doc = {key: "val1"}
collection.insert(doc, function(error, writeResult) {
	if(error)
		throw error;

	var id = doc._id;

	collection.update({_id: id}, {key: "someval22"}, function(error, updated) {
		if(error)
			throw error;
		else
			console.log(id + " updated successfully");
	});
});

Remove

var mongolocal = require('mongolocal');
var extCollection = []; // collection is a simple array
var collection = mongolocal({
	collection: extCollection,
	remove: function(index) {
		collection.splice(index, 0);
	}
});

var doc = {key: "val1"}
collection.insert(doc, function(error, writeResult) {
	if(error)
		throw error;
	else {
		var id = doc._id;
		collection.remove({_id: id}, function(error, success) {
			if(error)
				throw error;
			else
				console.log(id + " removed");
		});
	}
});