public function show(Request $request, $slug)
 {
     $lesson = Lesson::with('series')->where('slug', $slug)->firstOrFail();
     $series = Series::with(['sections' => function ($query) {
         $query->orderBy('series_order', 'asc');
     }])->find($lesson->section->series_id);
     //dd($lesson);
     if ($request->user() and $request->user()->series->contains($lesson->section->series_id) || $request->user()->stripe_active == 1) {
         $user_lessons = Auth::user()->lessons;
         return view('lesson.show', compact('lesson', 'series', 'user_lessons'));
     } else {
         return redirect('purchase/' . $series->slug);
     }
     return redirect('login')->withErrors('You must be logged in to view this lesson.');
 }