How to Implement Cascading Deletion in Laravel Eloquent using Event Listeners?

Cascading Deletion in Laravel Eloquent ORM

When working with relational databases, it's often necessary to implement cascading deletion mechanisms. In Laravel's Eloquent ORM, this can be achieved through event listeners.

Specifically, you can utilize the "deleting" event to trigger a callback when a certain model is about to be deleted. This callback can then perform any necessary cleanup, such as deleting related rows in the database.

To implement this, add an event listener inside your model class using the "booted()" method, as demonstrated in the code snippet provided in the accepted answer:

namespace App\Models;

use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    public function photos()
    {
        return $this->has_many('Photo');
    }

    protected static function booted()
    {
       static::deleting(function (User $user) {
           $user->photos()->delete();
       });
    }
}

By defining this event listener, the provided callback will be executed automatically whenever a row belonging to the "User" model is deleted. This allows you to cascade the deletion to the related "Photo" model seamlessly and without the need for manual intervention.

Additionally, it's recommended to wrap this operation within a transaction to maintain referential integrity in the database effectively.

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