Pass Query Builder instance to callback

Author: pmatseykanets

src/PostgresEngine.php

@@ -263,7 +263,7 @@ protected function performSearch(Builder $builder, $perPage = 0, $page = 1)
         // file or individually for each model in searchableOptions()
         // See https://www.postgresql.org/docs/current/static/textsearch-controls.html
         $tsQuery = $builder->callback
-            ? call_user_func($builder->callback, $builder, $this->searchConfig($builder->model))
+            ? call_user_func($builder->callback, $builder, $this->searchConfig($builder->model), $query)
             : $this->defaultQueryMethod($builder->query, $this->searchConfig($builder->model));
 
         $query->crossJoin($this->database->raw($tsQuery->sql().' AS "tsquery"'));