} elseif (array_key_exists('course_id', $data)) {
         $course = $data['course_id'];
         $tests = Evaluacion::where('id_curso', '=', $course)->get();
     } else {
         $tests = Evaluacion::all();
     }
     return Response::json($tests);
 });
 // /api/questions
 Route::get('questions', function () {
     $data = Input::all();
     if (array_key_exists('test_id', $data)) {
         $test = $data['test_id'];
         $questions = Pregunta::where('id_evaluacion', '=', $test)->get();
     } else {
         $questions = Pregunta::all();
     }
     return Response::json($questions);
 });
 // GET /api/grade
 Route::get('grade', function () {
     $data = Input::all();
     $test = $data['test_id'];
     $user = $data['user_id'];
     $grade = Calificacion::where('id_evaluacion', '=', $test)->where('id_usuario', '=', $user)->get();
     return Response::json($grade);
 });
 // POST /api/grade
 Route::post('grade', function () {
     $data = Input::all();
     $test = $data['test_id'];
 public function lista()
 {
     $preguntas = Pregunta::all();
     return View::make('Pregunta/lista')->with('preguntas', $preguntas);
 }