add unique field name

app/Http/Controllers/RoleController.php

@@ -11,7 +11,7 @@ class RoleController extends Controller
 	public function add(Request $request)
 	{
 		$this->validate($request, [
-			'name' => 'required',
+			'name' => 'string|required|unique:m_roles,name',
 			'description' => 'required'
 		]);
 
@@ -44,7 +44,12 @@ class RoleController extends Controller
 		if(empty($id) || !is_int((int)$id))
 			return response()->json(['status'=>'failed','message'=>'id is required!','code'=>400], 400);
 
+        $this->validate($request, [
+            'name' => 'string|required',
+            'description' => 'required'
+		]);
 		$data = Role::find($id);
+		$request->name !== $data['name'] ? $this->validate($request,['name'=>'unique:m_roles,name']) : '';
 
 		if(!$data)
 			return response()->json(['status'=>'failed','message'=>'Data not found!','code'=>404], 404);