some1

userSchema.pre('save', function(next) {
  var user = this;
  if (!user.isModified('password')) return next();
  bcrypt.genSalt(10, function(err, salt) {
    if (err) return next(err);
    bcrypt.hash(user.password, salt, function(err, hash) {
      if (err) return next(err);
      user.password = hash;
      next();
    });
  });
});