use the Custom Defined Instance Methods

	// Lookup a Proxy
	Proxy.findOne(1).done(function(err, proxy) {
	    // we now have a model with instance methods attached
	    // update an attribute value
	    proxy.fatchHit = proxy.fatchHit + 1;
	    // save the updated value
	    proxy.save(function(err) {
			// value has been saved
	    });
	});