/**
  * Store a newly created resource in storage.
  *
  * @param CreateLessonRequest $request
  * @return \Illuminate\Http\RedirectResponse
  */
 public function store(CreateLessonRequest $request)
 {
     $lesson = new Lesson();
     $lesson->fill($request->all());
     $lesson->user_id = Auth::user()->id;
     $lesson->save();
     $message = trans('messages.created_successfully_lesson');
     Flash::success($message);
     return redirect()->route('teacher.units.show', $lesson->unit);
 }