Update docs

docs/advanced-usage/storing-metadata.md

@@ -7,14 +7,23 @@ You can add metadata, such as the `id` of the logged in user, to a stored event.
 
 ## Storing metadata on all events
 
-If you need to store metadata on all events you can leverage Laravel's native models events.
+If you need to store metadata on all events you can leverage Laravel's native models events when using the `EloquentStoredEventRepository`.
 
-You must configure the package [use your own event storage model](/laravel-event-projector/v2/advanced-usage/using-your-own-event-storage-model). On that model you can hook into the model lifecycle hooks.
+You must configure the package to [use your own event storage repository](/laravel-event-projector/v3/advanced-usage/using-your-own-event-storage-repository) that extends the `EloquentStoredEventRepository` with a custom Eloquent model. On that model you can hook into the model lifecycle hooks.
 
 ```php
-use Spatie\EventProjector\Models\StoredEvent;
+use Spatie\EventProjector\EloquentStoredEventRepository;
+
+class CustomStoredEventRepository extends EloquentStoredEventRepository
+{
+    protected $storedEventModel = CustomStoredEvent::class;
+}
+```
+
+```php
+use Spatie\EventProjector\Models\EloquentStoredEvent;
 
-class CustomStoredEvent extends StoredEvent
+class CustomStoredEvent extends EloquentStoredEvent
 {
     public static function boot()
     {
@@ -29,7 +38,8 @@ class CustomStoredEvent extends StoredEvent
 
 ## Storing metadata via a projector
 
-The `StoredEvent` instance will be passed on to any projector method that has a variable named `$storedEvent`. On that `StoredEvent` instance there is a property, `meta_data`, that returns an instance of `Spatie\SchemalessAttributes\SchemalessAttributes`.
+The `StoredEvent` instance will be passed on to any projector method that has a variable named `$storedEvent`. You'll also need the `StoredEventRepository` that is used by the application to update the stored event. 
+On the `StoredEvent` instance there is a property, `meta_data`, that returns an array. You can update this array to store any metadata you like.
 
 Here's an example:
 
@@ -53,13 +63,12 @@ class MetaDataProjector implements Projector
         MoneyAdded::class => 'onMoneyAdded',
     ];
 
-    public function onMoneyAdded(StoredEvent $storedEvent)
+    public function onMoneyAdded(StoredEvent $storedEvent, StoredEventRepository $repository)
     {
-
         if (Projectionist::isReplaying()) {
            $storedEvent->meta_data['user_id'] = auth()->user()->id;
 
-           $storedEvent->save();
+           $repository->update($storedEvent);
         }
 
         // ...