gistfile1.js

DAOFactory.prototype.get_or_create = function(params, defaults){
    var self = this;

    return new Utils.CustomEventEmitter(function(emitter) {
		self.find({ where: params })
			.success(
				function(instance){
					if (instance === null) {
						for (var attrname in defaults) {
							params[attrname] = defaults[attrname];
						}

						self.create(params).success(
							function(instance) {
								emitter.emit('success', instance)
							}
						)
					} else {
						emitter.emit('success', instance)
					}
				}
			);
    }).run()
}

Re-implementing Django's ORM? :P

I'm not really into node but, don't you also have to emit the failures?

Yup, this gist is incomplete :P

https://github.com/sdepold/sequelize/pull/225

This is the correct version!