gistfile1.js

sUser.pre('save', co(function *(next) {
  if (!this.isModified('password')) return next();
  this.password = yield this.encryptPassword(this.password)
  return next()
}))

sUser.methods.encryptPassword = function *(password) {
  var salt = yield thunkify(bcrypt.genSalt)(10)
  return yield thunkify(bcrypt.hash)(password, salt, null)
}