how to populate virtual fields in the response of create document

https://github.com/Automattic/mongoose/issues/3225

as per this its working perfect the data from field is getting populated in virtual field in case of getById

var countrySchema = new mongoose.Schema({
    capitalId: {type:String}
});

countrySchema.virtual('capital',{
    ref: 'City',
    localField: 'capitalId',
    foreignField: '_id',
    justOne: true
});

countrySchema.set('toObject', { virtuals: true });
countrySchema.set('toJSON', { virtuals: true });

Country.find().populate('capital') 

======================

what about create case after create in response if i want the virtual field to get populated.

i added following code for that but its not working

countrySchema.post(“save”, async function(){ await this.populate({ path: “capital”, model: “City” }).execPopulate(); })

[NitinMagdum]

Thanks @indraraj26 @vkarpov15 @IslandRhythms

[indraraj26]

@NitinMagdum whatever you will do you are going to make another request in order to get the data from another collection.

As per your initial post, This will work

const mongoose = require('mongoose');

let CountrySchema = new mongoose.Schema({
    capitalId: mongoose.Types.ObjectId
}, {
    toJSON: {virtuals: true},
    toObject: {virtuals: true},
});

CountrySchema.virtual('capital', {
    ref: 'City',
    localField:  'capitalId',
    foreignField: '_id',
    justOne: true
})

CountrySchema.post('save', async function() {
   await this.populate('capital').execPopulate();
})

let CitySchema = new mongoose.Schema({
    name: String
});


run().catch((err) => console.log(err));

async function run() {
    await mongoose.connect('mongodb://localhost:27017/test', {
        useNewUrlParser: true,
        useUnifiedTopology: true,
    });
    await mongoose.connection.dropDatabase();
 
    const CountryModel = mongoose.model('Country', CountrySchema);
    const CityModel = mongoose.model('City', CitySchema);
    const cityRes = new CityModel({ name: 'Mumbai' });
    const savedCity = await cityRes.save();
    const countryRes = new CountryModel({capitalId: savedCity._id});
    const savedCountry = await countryRes.save();
    console.log(savedCountry, 'savedsavedCountry')
}