diff --git a/src/BaseRequest.php b/src/BaseRequest.php
index 1fa7638..cba3853 100644
--- a/src/BaseRequest.php
+++ b/src/BaseRequest.php
@@ -4,6 +4,7 @@
 
 use Illuminate\Support\Arr;
 use Illuminate\Foundation\Http\FormRequest;
+use RonasIT\Support\Exceptions\InvalidModelException;
 
 class BaseRequest extends FormRequest
 {
@@ -42,6 +43,17 @@ public function onlyValidated($keys = null, $default = null): array
         return $validatedFields;
     }
 
+    protected function getOrderableFields(string $modelName, array $additionalFields = []): string
+    {
+        if (!class_exists($modelName)) {
+            throw new InvalidModelException("The model {$modelName} does not exist.");
+        }
+
+        $fields = array_merge($modelName::getFields(), $additionalFields);
+
+        return implode(',', $fields);
+    }
+
     protected function filterOnlyValidated($fields, $validation): array
     {
         $result = [];
diff --git a/tests/BaseRequestTest.php b/tests/BaseRequestTest.php
new file mode 100644
index 0000000..ff003eb
--- /dev/null
+++ b/tests/BaseRequestTest.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace RonasIT\Support\Tests;
+
+use ReflectionClass;
+use RonasIT\Support\BaseRequest;
+use RonasIT\Support\Tests\Support\Mock\TestModel;
+use RonasIT\Support\Tests\Support\Traits\TableTestStateMockTrait;
+
+class BaseRequestTest extends HelpersTestCase
+{
+    use TableTestStateMockTrait;
+
+    public function testGetOrderableFields()
+    {
+        $baseRequest = new BaseRequest();
+        $reflectionClass = new ReflectionClass($baseRequest);
+
+        $method = $reflectionClass->getMethod('getOrderableFields');
+        $result = $method->invoke($baseRequest, TestModel::class);
+
+        $modelFields = 'id,name,json_field,castable_field,*,created_at,updated_at';
+
+        $this->assertEquals($modelFields, $result);
+    }
+
+    public function testGetOrderableFieldsWithAdditionalFields()
+    {
+        $baseRequest = new BaseRequest();
+        $reflectionClass = new ReflectionClass($baseRequest);
+
+        $method = $reflectionClass->getMethod('getOrderableFields');
+        $result = $method->invoke($baseRequest, TestModel::class, ['additional_field_1', 'additional_field_2']);
+
+        $modelAndAdditionalFields = 'id,name,json_field,castable_field,*,created_at,updated_at,additional_field_1,additional_field_2';
+
+        $this->assertEquals($modelAndAdditionalFields, $result);
+    }
+}