[v4] - How to delete with relationship

[kempsteven]

Soo I have a Delivery Model and has a hasMany relationship with SelectedDriver Model
and the SelectedDriver Model also have a hasMany relationship with Invoice Model and other models.

class Delivery extends Model {
  selected_driver() {
    return this.hasMany('App/Models/SelectedDriver')
  }
}

class SelectedDriver extends Model {
  user() {
    return this.belongsTo('App/Models/User')
  }

  delivery_orders() {
    return this.hasMany('App/Models/DeliveryOrder')
  }

  stocks() {
    return this.hasMany('App/Models/Stock')
  }

  estimated_revenue() {
    return this.hasOne('App/Models/EstimatedRevenue')
  }

  invoices() {
    return this.hasMany('App/Models/Invoice')
  }
}

so what I want to ask is what is the best and easiest way to delete all of them when I delete A Delivery??
When I delete a Delivery, the Selected Drivers and Invoices should be deleted as well.
Thanks in Advance for the help!

[thetutlage]

This is something that will be well done within the database using the on delete cascade option. If you are unaware of how this option works in SQL, then I recommend first reading a bit about and then you can use AdonisJS migrations to set the on delete cascade when creating database tables