add customer api

common/models/EventRegistration.php

@@ -65,4 +65,14 @@ class EventRegistration extends \yii\db\ActiveRecord
         ],
             parent::behaviors());
     }
+
+
+    public function getEvent(){
+        return $this->hasOne(Event::class,['id' => 'id_event']);
+    }
+
+    public function getCustomer(){
+        return $this->hasOne(Customer::class,['id' => 'id_customer']);
+    }
+
 }