Eloquent Attach/Detach/Sync Fires Any Event
eloquent-attach-detach-sync-fires-any-event
I have a laravel project, and I need to make some calculations immediately after I save a model and attach some data to it.
Is there any event that is triggered in laravel after calling attach (or detach/sync)?
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1As far as I know there is no event called. However you could use the event handlers to fire one – cleanunicornMar 8 '15 at 18:50
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Thanks! @hydrarulz yes but I will have to take care to fire it manually every time I use attach on that specific model, not optimal – Mihai Crăiță Mar 8 '15 at 20:27
No, there are no relation events in Eloquent. But you can easily do it yourself (Given for example Ticket belongsToMany Component
relation):
// Ticket model
use App\Events\Relations\Attached;
use App\Events\Relations\Detached;
use App\Events\Relations\Syncing;
// ...
public function syncComponents($ids, $detaching = true)
{
static::$dispatcher->fire(new Syncing($this, $ids, $detaching));
$result = $this->components()->sync($ids, $detaching);
if ($detached = $result['detached'])
{
static::$dispatcher->fire(new Detached($this, $detached));
}
if ($attached = $result['attached'])
{
static::$dispatcher->fire(new Attached($this, $attached));
}
}
event object as simple as this:
<?php namespace App\Events\Relations;
use Illuminate\Database\Eloquent\Model;
class Attached {
protected $parent;
protected $related;
public function __construct(Model $parent, array $related)
{
$this->parent = $parent;
$this->related = $related;
}
public function getParent()
{
return $this->parent;
}
public function getRelated()
{
return $this->related;
}
}
then a basic listener as a sensible example:
// eg. AppServiceProvider::boot()
$this->app['events']->listen('App\Events\Relations\Detached', function ($event) {
echo PHP_EOL.'detached: '.join(',',$event->getRelated());
});
$this->app['events']->listen('App\Events\Relations\Attached', function ($event) {
echo PHP_EOL.'attached: '.join(',',$event->getRelated());
});
and usage:
$ php artisan tinker
>>> $t = Ticket::find(1);
=> <App\Models\Ticket>
>>> $t->syncComponents([1,3]);
detached: 4
attached: 1,3
=> null
Of course you could do it without creating Event objects, but this way is more convenient, flexible and simply better.