I want my pre('save') mongoose function to operate only once

Question

I do not know if the exact request in title is possible, but if not; i would really appreciate an alternate solution.

I have this pre save method of mongoose

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Answer 1

You could use isModified method on your 'password' field.

I use it in this way, only run bcrypt if the password property was changed:

UserSchema.pre('save', function (next) {
  var user = this;

  if (user.isModified('password')) {
    bcrypt.genSalt(10, (err, salt) => {
      bcrypt.hash(user.password, salt, (err, hash) => {
        user.password = hash;
        next();
      });
    });
  } else {
    next();
  }
});