Add reactive properties to a backbone model to allow plain Object manipulation.

backbone-model-reactive.js

var originalSet = Backbone.Model.prototype.set
  , noConflictPrefix = '$$';

/**
 * During initial construction, a model
 * calls set(), but there is also a check
 * to ensure the reactivity only occurs on construction
 */
Backbone.Model.prototype.set = function() {
	var duringConstruction = (this.changed === null);
	var retval = originalSet.apply(this, arguments);
	if (duringConstruction) {
		_.each(this.attributes, function(val, key) {
			var propName = this[key] ? noConflictPrefix + key : key;
        
			Object.defineProperty(this, propName, {
				get: this.get.bind(this, key),
				set: this.set.bind(this, key)
			});
		}, this);
	}
	return retval;
}