how to stop mongoose from writing schema defaults when using find?

[samislam]

I have defined these three models in mongoose:

const clientSchema = new mongoose.Schema({
  name: String,
  role: String,
  age: {
     type: Number,
     default: 10
  }
})
clientSchema.pre('save', function(){
  const doc = this
  doc.role = 'client'
})
const adminSchema = new mongoose.Schema({
  name: String,
  role: String,
})
adminSchema.pre('save', function(){
  const doc = this
  doc.role = 'admin'
})
const userSchema = new mongoose.Schema({
  name: String,
  role: String,
  age: {
     type: Number,
     default: 10
  },
})
const AdminModel = mongoose.model('AdminModel', AdminModel, 'users')
const ClientModel = mongoose.model('ClientModel', ClientModel, 'users')
const UserModel = mongoose.model('UserModel', UserModel, 'users')

and I have the following route in my express app:

app.route('/users').get(async(req, res, next)=>{
   const docs = UserModel.find({ role: 'admin' })
})

It works as expected, except that it's returning the following to the client-side:

{
  "name": "James Breakers",
  "role": "admin",
  "age": 10
}

and this is wrong, and it causes many problems.

On write, it works great, it saves it in the database without the age: 10, but the problem is when retrieving (reading) from the database, Mongoose is setting the field age: 10.

and All of that is only because I used the UserModel to retrieve that admin. But I don't want that default behavior of Mongoose at all.

How can I disable it? is there a schema option for that?

The question is also posted on StackOverflow as well
https://stackoverflow.com/questions/73583477/how-to-stop-mongoose-from-writing-schema-defaults-when-using-find-edited

[vkarpov15]

const docs = await UserModel.find({ role: 'admin' }).setOptions({ defaults: false }) in Mongoose >= 5.12.10, see #7287

[samislam]

Great, is there a way we can do this on the schema level? by passing a property to the schema options?

[vkarpov15]

You would have to create a middleware.

schema.pre('find', function() {
  this.setOptions({ defaults: false });
});