Laravel: how to create a function After or Before

问题:

I need to generate a function to call after or before save() or update() but i don't know how to do. I think I need a callback from save() update() but I don't know how to do. Thanks

回答1:

Inside your model, you can add a boot() method which will allow you to manage these events.

For example, having User.php model:

class User extends Model 
{

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

        self::creating(function($model){
            // ... code here
        });

        self::created(function($model){
            // ... code here
        });

        self::updating(function($model){
            // ... code here
        });

        self::updated(function($model){
            // ... code here
        });

        self::deleting(function($model){
            // ... code here
        });

        self::deleted(function($model){
            // ... code here
        });
    }

}

You can review all available events over here: https://laravel.com/docs/5.2/eloquent#events

回答2:

Create a provider by using this command

php artisan make:provider ProviderClassName

then define the callbacks for models in boot function

Model::created(function($model){
  //Do you want to do
});

List of available callbacks:

Model::creating(function($model){});
Model::updated(function($model){});
Model::updating(function($model){});
Model::deleted(function($model){});
Model::deleting(function($model){});
Model::saving(function($model){});
Model::saved(function($model){});