save history on ActiveRecord events

Bootstrap.php

@@ -2,15 +2,51 @@
 
 namespace qvalent;
 
+use Yii;
 use yii\base\BootstrapInterface;
+use yii\base\Event;
 use yii\db\ActiveRecord;
+use yii\helpers\ArrayHelper;
 
 class Bootstrap implements BootstrapInterface
 {
+    const INSERT = 1;
+    const UPDATE = 2;
+    const DELETE = 3;
+
+    /**
+     * @param \yii\base\Application $app
+     */
     public function bootstrap($app)
     {
-        $app->on(ActiveRecord::EVENT_AFTER_UPDATE, function () {
-
+        Event::on(ActiveRecord::className(), ActiveRecord::EVENT_AFTER_INSERT, function ($event) {
+            $this->insertHistory($event->sender, self::INSERT);
+        });
+        Event::on(ActiveRecord::className(), ActiveRecord::EVENT_AFTER_UPDATE, function ($event) {
+            $this->insertHistory($event->sender, self::UPDATE);
+        });
+        Event::on(ActiveRecord::className(), ActiveRecord::EVENT_AFTER_DELETE, function ($event) {
+            $this->insertHistory($event->sender, self::DELETE);
         });
     }
+
+    /**
+     * @param $model ActiveRecord
+     * @param $type
+     * @throws \yii\db\Exception
+     */
+    private function insertHistory($model, $type)
+    {
+        Yii::$app->db->createCommand()
+            ->insert('{{%models_history}}', [
+                'model_class' => $model::className(),
+                'pk' => is_array($model->getPrimaryKey())
+                    ? json_encode($model->getPrimaryKey()) // if pk is composite
+                    : $model->getPrimaryKey(),
+                'operation_type' => $type,
+                'attributes_json' => json_encode(ArrayHelper::toArray($model)),
+                'created_at' => time()
+            ])
+            ->execute();
+    }
 }