Issue with virtual population in Mongoose - node.js

Question

I am using mongo DB with node.js and all models is in common folder and using virtual population to communicate between the models.For Example model1->model2->model3(model1 have the dependencies of model2 and model2 have the dependencies of model3).
Here is the code:
var packageGroupSchema = new Schema(
{
packageGroupCode: { type: String, required: true, unique: true},
packageGroupName: { type: String, required: true },
description: String,
**moduleId: { type: Schema.Types.ObjectId, required: true },**
active: Boolean,
createdDate: { type: Date, default: Date.now},
lastUpdatedDate: { type: Date, default: Date.now}
},
{
toJSON: { virtuals: true }
}
);
packageGroupSchema.virtual('moduleData', {
ref: 'Module',
localField: 'moduleId',
foreignField: '_id',
justOne: true
});
2nd Model:
//module Schema
var moduleSchema = new Schema(
{
moduleCode: { type: String, required: true, unique: true},
moduleName: { type: String, required: true },
description: String,
**categoryId: { type: Schema.Types.ObjectId, required: true },**
active: Boolean,
createdDate: { type: Date, default: Date.now},
lastUpdatedDate: { type: Date, default: Date.now}
},
{
toJSON: { virtuals: true },
toObject: {virtuals: true}
}
);
moduleSchema.virtual('categoryData', {
ref: 'Category',
localField: 'categoryId',
foreignField: '_id',
justOne: true
});
If I am runing the api for first model so I am geeting the data of dependencris(category) form the 2nd model.
Here is the result I am getting:
{
"_id": "59410a5dab85113a7cdc0507",
"packageGroupCode": "P02",
"packageGroupName": "package2",
"description": "package2",
"moduleId": "5940efeadb8fe72a8cb4e056",
"active": true,
"__v": 0,
"lastUpdatedDate": "2017-06-14T11:30:43.798Z",
"createdDate": "2017-06-14T11:30:43.798Z",
"moduleData": {
"_id": "5940efeadb8fe72a8cb4e056",
"moduleName": "module name",
**"categoryData": null,**
**"id": "5940efeadb8fe72a8cb4e056"**
},
**"id": "59410a5dab85113a7cdc0507"**
}
Can anybody tell me what I have to do to ignore catergoryData in moduleDate and id repetition.
Expexted JSON should be like this:
{
"_id": "59410a5dab85113a7cdc0507",
"packageGroupCode": "P02",
"packageGroupName": "package2",
"description": "package2",
"moduleId": "5940efeadb8fe72a8cb4e056",
"active": true,
"__v": 0,
"lastUpdatedDate": "2017-06-14T11:30:43.798Z",
"createdDate": "2017-06-14T11:30:43.798Z",
"moduleData": {
"_id": "5940efeadb8fe72a8cb4e056",
"moduleName": "module name"
}
}

Answer 1

if your result is stored in "theObject" you can remove the keys like this:
delete theObject["id"];
delete theObject["moduleData"]["id"];
delete theObject["moduleData"]["categoryData"];