add group by feature to datatable

app/Services/DataTable/DataTableService.php

@@ -13,6 +13,7 @@ class DataTableService
     protected array $allowedRelations;
     protected array $allowedSortings;
     protected array $allowedSelects;
+    protected array $allowedGroupBy;
     private int $totalRowCount;
 
     public function __construct(
@@ -46,6 +47,12 @@ class DataTableService
         return $this;
     }
 
+    public function setAllowedGroupBy(array $allowedGroupBy): DataTableService
+    {
+        $this->allowedGroupBy = $allowedGroupBy;
+        return $this;
+    }
+
     /**
      * Handle 'getData' operations
      * @return array
@@ -88,7 +95,9 @@ class DataTableService
         foreach ($sorting as $sort){
             $query = (new ApplySort($query, $sort))->apply();
         }
-        
+
+        $query = $this->applyGroupBy($query, $this->allowedGroupBy);
+
         return $query;
     }
 
@@ -101,6 +110,11 @@ class DataTableService
         return $query;
     }
 
+    protected function applyGroupBy(Builder $query, array $groupBy): Builder
+    {
+        return empty($groupBy) ? $query : $query->groupBy($groupBy);
+    }
+
     protected function includeRelationsInQuery(Builder $query, array $rels): Builder
     {
         if (!empty($rels)) {