I don't know about this, seems like a lot of technical debt to me.
Choosing mySQL over mongoDB to start with really can't add that much time to a project, especially if you're doing it in a language like Ruby. A couple hours extra here seems very worth it to avoid a multi-week migration process a couple years down the road.
Choosing mySQL over mongoDB to start with really can't add that much time to a project, especially if you're doing it in a language like Ruby. A couple hours extra here seems very worth it to avoid a multi-week migration process a couple years down the road.