public function index()
 {
     //$books = Book::available()->orderByTitle()->lists('title', 'id');
     $students = Student::notLimit()->active()->orderByName()->lists('name', 'id');
     //$categories = Category::lists('category', 'id');
     $categories = Category::get();
     return view('lms.peminjaman.peminjaman', compact('students', 'categories'));
 }