Laravel - Delete if no relationship exists

Question

Below is the one of the model. I would like to delete a Telco entry only if no other model is referencing it? What is the best method?

namespace App;

use Illuminate\Database\Eloquent\Model;

class Telco extends Model
{
    public function operators()
    {
        return $this->hasMany('App\Operator');
    }

    public function packages()
    {
        return $this->hasMany('App\Package');
    }

    public function topups()
    {
        return $this->hasMany('App\Topup');
    }

    public function users()
    {
        return $this->morphMany('App\User', 'owner');
    }

    public function subscribers()
    {
        return $this->hasManyThrough('App\Subscriber', 'App\Operator');
    }
}

Answer 1

You can use deleting model event and check if there any related records before deletion and prevent deletion if any exists.

In your Telco model

protected static function boot()
{
    parent::boot();

    static::deleting(function($telco) {
        $relationMethods = ['operators', 'packages', 'topups', 'users'];

        foreach ($relationMethods as $relationMethod) {
            if ($telco->$relationMethod()->count() > 0) {
                return false;
            }
        }
    });
}