See if this works,

$this->validate($request, [
    'subject' => ['required'],
    'name' => ['required', Rule::unique('exam','name')
        ->ignore($this->route('id'))
        ->where(function($q){
            $q->where('subject', $this->get('subject'));
        })
]);

Class 'App\Http\Controllers\Rule' not found

$this->validate($requ- list text hereest, [ 'subject' => ['required'], 'name' => ['required', Rule::unique('exam','name') ->ignore($this->route('id')) ->where(function($q){ $q->where('subject', $this->get('subject')); }) ]);

so i put this use Illuminate\Validation\Rule;

but now i'm getting this error

Method [route] does not exist.

http://aice.webtutorialguru.com/faltu/db.jpg here is a preview of the table. please have a look

i want the combination of the "name" and "subjectId" to be unique in "exam" table

thanks for you answer

Ok I see.

Hopefully This should work.

$this->validate($request, [
    'subject' => ['required'],
    'name' => [
        'required',
        Rule::unique('exam','name')
            ->ignore($request->route('id'))
            ->where(function($q) use ($request){
                $q->where('subjectId', $request->get('subjectId'));
            }),
]);

Change the query inside the where closure as you need.