add new factory method

Author: taylorotwell

src/Illuminate/Database/Eloquent/Factories/HasFactory.php

@@ -12,8 +12,20 @@ trait HasFactory
      */
     public static function factory(...$parameters)
     {
-        return Factory::factoryForModel(get_called_class())
+        $factory = static::newFactory() ?: Factory::factoryForModel(get_called_class());
+
+        return $factory
                     ->count(is_numeric($parameters[0] ?? null) ? $parameters[0] : null)
                     ->state(is_array($parameters[0] ?? null) ? $parameters[0] : ($parameters[1] ?? []));
     }
+
+    /**
+     * Create a new factory instance for the model.
+     *
+     * @return \Illuminate\Database\Eloquent\Factories\Factory
+     */
+    public static function newFactory()
+    {
+        //
+    }
 }