example/ChatExample/app/controllers/errors.server.controller.js
function(err) {
	var output;

	try {
		var fieldName = err.err.substring(err.err.lastIndexOf('.$') + 2, err.err.lastIndexOf('_1'));
		output = fieldName.charAt(0).toUpperCase() + fieldName.slice(1) + ' already exists';

	} catch (ex) {
		output = 'Unique field already exists';
	}

	return output;
}
function(err) {
	var output;

	try {
		var fieldName = err.err.substring(err.err.lastIndexOf('.$') + 2, err.err.lastIndexOf('_1'));
		output = fieldName.charAt(0).toUpperCase() + fieldName.slice(1) + ' already exists';

	} catch (ex) {
		output = 'Unique field already exists';
	}

	return output;
}
Get unique error field name