fixing upper function for pgsql (#641)

* fix: fixing upper function for pgsql

* Fix styling

---------

Co-authored-by: binaryk <[email protected]>

Author: binaryk

src/Filters/SearchableFilter.php

@@ -44,7 +44,11 @@ public function filter(RestifyRequest $request, $query, $value)
         if (! config('restify.search.case_sensitive')) {
             $upper = strtoupper($value);
 
-            return $query->orWhereRaw("UPPER({$this->column}) LIKE ?", ['%'.$upper.'%']);
+            $columnExpression = $connectionType === 'pgsql'
+                ? "UPPER({$this->column}::text)"
+                : "UPPER({$this->column})";
+
+            return $query->orWhereRaw("{$columnExpression} LIKE ?", ['%'.$upper.'%']);
         }
 
         return $query->orWhere($this->column, $likeOperator, "%{$value}%");