NOTE:

Forked from: https://github.com/JavierGarridoIglesias/mongoose-json-patch

To add running patch instead of save.

mongoose-json-patch

Adds JSON Patch (RFC 6902) support to Mongoose models.

Diclaimer:

I have re-published this original package just to be able to update the dependencies. All credits to the original author(s). Please take into account the warning published in the original package, the original package was deprecated for unclear reasons: https://www.npmjs.com/package/mongoose-json-patch

###Don't patch like an idiot.

Usage

npm install --save @etomon/mongoose-json-patch

mongoose-json-patch is used as a Mongoose plugin.

var mongoose = require('mongoose'),
	patcher = require('mongoose-json-patch');

var CarSchema = new mongoose.Schema({ ... });
CarSchema.plugin(patcher);

mongoose.model('Car', CarSchema);

Your documents now have a patch method that accepts an array of JSON patches and a callback method. The patches are applied, the document is saved, and any patch errors are returned to the callback.

var myCar = new Car({
	make: 'Honda',
	model: 'CR-V',
	year: 1999
});

var patches = [
	{ op: 'replace', path: '/model', value: 'Civic' }
];

myCar.patch(patches, function callback(err) {
	if(err) return next(err);
	res.send(myCar);

	/* myCar:
		{
			make: 'Honda',
			model: 'Civic',
			year: 1999
		}
	*/
});

Preventing Writes

Defining any schema paths as writable: false will return an error if a patch tries to modify that path. _id and __v are blocked by default.

var CarSchema = new mongoose.Schema({

	owner: {type: String, writable: false}
	
});

Bonus

Read Protection

There are some properties that you never want to leave the server (like passwords), and you can use Mongoose's select query method to filter out certain properties. However, this will not work if you wanted to work with all properties server-side before sending them to the client. For that, this plugin also adds a filterProtected method to all documents. It will return a copy of your document, removing any properties that have been defined as readable: false in the schema.

var CarSchema = new mongoose.Schema({
	make: {type: String},
	key: {type: String, readable: false}
});

var Car = mongoose.model('Car', CarSchema);

var myCar = new Car({make: 'Honda', model: 'CR-V', key: 'secret15829a'});

myCar; // {make: 'Honda', model: 'CR-V', key: 'secret15829a'}
myCar.filterProtected(); // {make: 'Honda', model: 'CR-V'}

Passing any arguments will filter additional properties.

myCar.filterProtected('make'); // {model: 'CR-V'}

If you have an array of documents that you need to filter, there is a static convenience method added to the model.

Car.filterProtected(carsArray);