the async version doesn't work -- and here is why

[niftylettuce]

I was browsing your source and saw you didn't know why async version wasn't working

compare your code with this module

https://github.com/tblobaum/mongoose-troop/blob/master/lib/basicAuth.js

you'll see you need to call it on the .pre('save') event, and not try to set a field value sync.