Show HN: Kerstman, a secret santa app built using rails

This is now the second secret santa matching app I've built to fill a problem I've had with many groups over the years. Loads of secret santas I've organised or been involved with have had couples who you don't really want to end up matched. As a result I've built a web app that allows you to specify a partner who you don't want that person to be giving to.

There's a few bugs wherein it won't successfully match everyone but I've made sure it won't bomb out or send an email to some people before everyone has a giftee and gifter. I'm mainly looking for feedback before I take it outside of testing at work and with friends so hopefully someone finds it of use.

https://github.com/RyanMacG/kerstman/tree/master