public function run()
 {
     $faker = Faker::create();
     $users = User::all();
     $qa = Qa::firstOrFail();
     $tutorial = Tutorial::firstOrFail();
     foreach (range(1, 50) as $index) {
         $user = $users->random();
         Comment::create(['content' => $faker->sentence, 'user_id' => $user->id, 'qa_id' => $qa->id]);
     }
     foreach (range(1, 50) as $index) {
         $user = $users->random();
         Comment::create(['content' => $faker->sentence, 'user_id' => $user->id, 'tutorial_id' => $tutorial->id]);
     }
 }