mongoose get db value in pre-save hook

Question

I want to know what the \'clean\' value of a dirty prop is in a pre-save mongoose hook like this:

UserSchema.pre(\'save\', function(next) {
    var user = th         


        

Answer 1

So in a pre-save hook, from what I can tell by reading this section of the source code, I don't think the previous value is stored anywhere. So you'll have to load the document from mongodb to get it.

However, you might want to use the virtuals mechanism instead of a pre-save hook to store the old value before changing it to the new value.

var virtual = schema.virtual('password');
virtual.set(function (v) {
  var this._oldPassword = this.password;
  return v;
});

Experiment with something along those lines and see if you can make something work suitably.