Fixes [#3266](#3266): cast config item to strings.

Author: Xu Li

src/DataTables.php

@@ -102,7 +102,7 @@ public function getConfig(): DataTablesConfig
      */
     public function query(QueryBuilder $builder): QueryDataTable
     {
-        $dataTable = Config::get('datatables.engines.query');
+        $dataTable = (string) Config::get('datatables.engines.query');
 
         $this->validateDataTable($dataTable, QueryDataTable::class);
 
@@ -116,8 +116,8 @@ public function query(QueryBuilder $builder): QueryDataTable
      */
     public function eloquent(EloquentBuilder $builder): EloquentDataTable
     {
-        $dataTable = Config::get('datatables.engines.eloquent');
-
+        $dataTable = (string) Config::get('datatables.engines.eloquent');
+        
         $this->validateDataTable($dataTable, EloquentDataTable::class);
 
         return $dataTable::create($builder);
@@ -132,7 +132,7 @@ public function eloquent(EloquentBuilder $builder): EloquentDataTable
      */
     public function collection($collection): CollectionDataTable
     {
-        $dataTable = Config::get('datatables.engines.collection');
+        $dataTable = (string) Config::get('datatables.engines.collection');
 
         $this->validateDataTable($dataTable, CollectionDataTable::class);
 

src/Processors/DataProcessor.php

@@ -68,7 +68,7 @@ public function __construct(protected iterable $results, array $columnDef, prote
     public function process($object = false): array
     {
         $this->output = [];
-        $indexColumn = Config::get('datatables.index_column', 'DT_RowIndex');
+        $indexColumn = (string) Config::get('datatables.index_column', 'DT_RowIndex');
 
         foreach ($this->results as $row) {
             $data = Helper::convertToArray($row, ['hidden' => $this->makeHidden, 'visible' => $this->makeVisible, 'ignore_getters' => $this->ignoreGetters]);