Add API to run callback after a model instance is saved

framework/core/CHANGELOG.md

@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - `route` attribute for Mithril elements as a shortcut to link to a route.
 - Abstract SettingsModal component for quickly building admin config modals.
 - "Debug" button to inspect the response of a failed AJAX request.
+- `Model::afterSave()` API to run callback after a model instance is saved.
 
 ### Changed
 - Migrations must be namespaced under `Flarum\Migrations\{Core|ExtensionName}`. ([#422](https://github.com/flarum/core/issues/422))

framework/core/src/Core/Model.php

@@ -35,6 +35,29 @@ abstract class Model extends Eloquent
      */
     public $timestamps = false;
 
+    /**
+     * An array of callbacks to be run once after the model is saved.
+     *
+     * @var callable[]
+     */
+    public $afterSaveCallbacks = [];
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function boot()
+    {
+        parent::boot();
+
+        static::saved(function (Model $model) {
+            foreach ($model->afterSaveCallbacks as $callback) {
+                $callback($model);
+            }
+
+            $model->afterSaveCallbacks = [];
+        });
+    }
+
     /**
      * Get the attributes that should be converted to dates.
      *
@@ -94,6 +117,17 @@ abstract class Model extends Eloquent
         );
     }
 
+    /**
+     * Register a callback to be run once after the model is saved.
+     *
+     * @param callable $callback
+     * @return void
+     */
+    public function afterSave($callback)
+    {
+        $this->afterSaveCallbacks[] = $callback;
+    }
+
     /**
      * @inheritdoc
      */