iridium

Iridium

A bare metal ORM for MongoDB

Iridium was designed to alleviate many of the issues often present in modern ORMs, especially those designed for NoSQL datastores like MongoDB. Namely, these include a high level of bloat and an excessive amount of documentation - vastly raising the barrier to entry. On the flip side of the coin, they also tend to abstract core database functionality away from the developer to the extent that they end up jumping through unnecessary hoops just to get the results they're looking for.

Iridium hopes to solve these issues by providing a bare bones ORM targeted at power users, and those looking for an exceptionally low overhead. It provides much of the indispensable functionality found in ORMs without the fluff.

Features

• Flexible Schema Validation MongoDB's greatest strength is its ability to support dynamic schemas, we think that's a great idea but sometimes it's necessary to be able to validate aspects of your models. That's where Iridium's validation framework comes in - with an intuitive schema design framework with support for optional and dynamic fields, you'll never find yourself stuck again.
• Powerful Transforms Anyone familiar with MongoDB knows the headaches that ObjectID causes due to its custom datatype. We also know that sometimes custom datatypes are unavoidable, or preferable for storage - though not necessarily ideal for processing. Iridium allows you to define a set of up-down transforms which are applied to parts of your model so that your code doesn't need to worry about these inconsistencies, and you can get down to writing the code you want to.
• IntelliSense Support We understand the value of an easy to use library, and having to go documentation diving every time you want to find out how to use a function is a pain we're all to familiar with. Iridium was designed from the ground up to include support for Visual Studio's IntelliSense engine - reducing the number of round trips between documentation and your code.
• Express Support Everyone who has written code using Node.js knows about Express, to help make your life easier we've included support right out of the box for Express.
• Powerful Models Iridium's models are designed to exist as individual files or modules within your application, this helps simplify management of your models and separates database design code from your application code. In addition to this, Iridium supports virtual properties, extension methods, transforms, client side property renaming and validations in an easy to understand and implement package.

Installation

Iridium is available using npm, which means you can install it locally using npm install iridium or add it to your project's package.json file to have it installed automatically whenever you run npm install.

We make use of the Semantic Versioning guidelines for our versioning system, as such we highly recommend you stick to a single major version of Iridium when developing an application. This can easily be handled through your package.json file by doing the following.

{
	// ...
	"dependencies": {
		"iridium": "1.x"
	}
}

Example

var iridium = require('iridium');

var database = new iridium({
	database: 'demo'
});

database.register('User', new iridium.Model('user', {
	firstname: String,
	lastname: String,
	since: Date,
	clown: Boolean,
	houses: [{
		address: String,
		colour: /Red|White|Blue|Green|Pink/
	}]
}));

database.connect(function(err, db) {
	if(err) throw err;

	// at this point database == db

	db.User.create({
		firstname: 'Billy',
		lastname: 'Bob',
		since: new Date(),
		clown: true,
		houses: [
			{ address: 'The middle of nowhere', colour: 'Red' }
		]
	}, function(err, user) {
		if(err) throw err;

		console.log(JSON.stringify(user));
	});
});

Core

The Iridium core (that sounds WAY cooler than I intended when I came up with the name) is where you create a database connection and register any models to be used by the database. Registration of models is optional, however it makes accessing them easier.

When using Iridium, you are required to instantiate a core with a settings object which describes the database server you want to connect to. This is done by calling the core's constructor and passing an object similar to the following.

{
	host: 'localhost', // Optional
	port: 27018, // Optional
	username: '', // Optional
	password: '', // Optional
	database: 'iridium'
}

Once you've got a core, you need to connect it to the database. This is done by calling the core's connect method and giving it a callback function. TODO

Models

TODO

Instances

TODO

Preprocessing Framework

The preprocessing framework allows Iridium to convert values from a form better suited to your database into a form more suitable for your application in an entirely transparent manner. This is acomplished through the use of a number of preprocessors which run when retrieving an object from the database, their order is reversed when pushing an object to the database.

Conversions

The transforms framework provides a low-level means to convert from one value type to another by means of up/down conversion functions. The up functions are used to convert the value before it is sent UPstream to the database, while down functions are used to convert the database value into the DOWNstream value used by your application.

var model = new Model(db, 'modelName', modelSchema, {
		preprocessors: [new Database.Convert({
			property: {
				$up: function(value) { return convertedValueForDatabase; },
				$down: function(value) { return convertedValueFromDatabase }
			}
		})]
	});

Renames

The renames framework allows you to access properties in a manner better suited to your application while keeping the same schema on the database side. This comes in handy when using the _id field for fields such as a user's username.

var model = new Model(db, 'modelName', modelSchema, {
		preprocessors: [new Database.Rename({
			_id: 'id'
		})]
	});

Credits

Thanks to Tadahiro Ishisaka for his brilliant nodeintellisense library, it has been used as the basis for IntelliSense support within this module.

I'd also like to thank dresende and dxg from the node-orm2 project for getting me introduced to Node and giving me many of the ideas for how a good ORM should be structured. If you're looking for an easy to use and more fully featured ORM with support for SQL and NoSQL databases, I'd seriously suggest giving node-orm2 a try.

Changelog

Version 2.0.0

<a style="border-radius: 2px; padding: 4px 8px; background: rgb(64, 120, 192); color: #fff;" href="https://github.com/SierraSoftworks/Iridium/releases/tag/v2.0.0">tag: v2.0.0</a>

npm install iridium@2.0.0

Changes

• 92fd5b4 Version bump to v2.0.0
• 1227c58 Updated README with new preprocessor API
• b1173c8 Updated examples to match new API
• 3460e87 Updated tests to match new preprocessors
• 7a54337 Updated Model to support new preprocessor framework
• b5baa54 Updated Instance to support new preprocessors
• 2070462 Added list of preprocessors to Database
• e26971f Replaced preprocessor framework