Populate does not consider toJSON and id:true

[parthpatel-simbiotik]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

8.4.0

Node.js version

21.7.1

MongoDB server version

7.0.8

Typescript version (if applicable)

No response

Description

I have 2 schema, and 1 was populating another one. and both has id:true and toJSON implemented to delete ret._id;

but not working after 8.4.0 when I switched back to 8.0.3 it is working fine. it created lot of issues since frontend was expecting id but was returning _id.

Steps to Reproduce

Try creating 2 schema and populate one from another, implement id:true and toJSON to remove any fields.

It will work on version 8.0.3 but will not work on 8.4.0

@Schema({ id: true, timestamps: true, toJSON: { virtuals: true, versionKey: false, transform(doc, ret) { delete ret._id; }, } })

PassingInfoSchema.virtual('entry', { ref: 'ParkingEntry', localField: 'entryId', foreignField: '_id', justOne: true, });

Expected Behavior

behavior of populated fields should be same as earlier.

Please look into it.

[IslandRhythms]

Please modify the script below to demonstrate your issue:

const mongoose = require('mongoose');

const testSchema = new mongoose.Schema({
  name: String
}, { id: true, timestamps: true, toJSON: { virtuals: true, versionKey: false, transform(doc,ret) { delete ret._id ;}}})

const otherSchema = new mongoose.Schema({
  name: String,
  testId: mongoose.Schema.Types.ObjectId
});

otherSchema.virtual('entry', { ref: 'Test', localField: 'testId', foreignField: '_id', justOne: true });

const Test = mongoose.model('Test', testSchema);

const Other = mongoose.model('Other', otherSchema);

async function run() {
  await mongoose.connect('mongodb://localhost:27017');
  await mongoose.connection.dropDatabase();

  const doc = await Test.create({
    name: 'Test Testerson'
  });

  const other = await Other.create({
    name: 'Other Otherson',
    testId: doc._id
  });
  const res = await Other.findOne().populate('entry');
  console.log('what is res', res, res.entry);
}

run();

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[github-actions]

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