I know that Devise can do this but I am not a big fan of devise because customization is very hard with Devise (I usually use AuthLogic). I want to use MongoDB as my main database I am just wondering if there is a gem already out there that uses MongoDB as its default storage. I have tried googling this but the most likely solution is a customized version of Devise.
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John Nunemaker put together a pretty basic one here:
https://gist.github.com/147427