Mongoose: try to remove referenced objects using $pullAll

In a nodejs app using Mongoose, I have a relation has many: App has many AppClients.

Models:

const mongoose = require('mongoose')

const appSchema = new mongoose.Schema(
name: String,
appClients : [ type: mongoose.Schema.Types.ObjectId, ref: 'AppClient' ]
)

appSchema.pre('remove', async function(next)
const app = this
await AppClient.remove(_id: $in: app.appClients ).exec()
next()
)

const App = mongoose.model('App', appSchema)

module.exports = App

const appClientSchema = new mongoose.Schema(
field1: String,
field2: String
)

const AppClient = mongoose.model('AppClient', appClientSchema)


What I wanted is to use $pullAll to remove the AppClients documents referenced in the App. I tried with:

appSchema.pre('remove', async function(next)
const app = this
await App.update( _id: app.id , $pullAll: appClients: app.appClients ).exec()
next()
)


but this not work. Does not throw any error but the 'app.appClients' are not removed> I was following the docs and can´t find out any problem/gap.

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