Added total time of a course, marking chapters and courses to sync offline.

app/Http/Controllers/CourseController.php

@@ -22,4 +22,11 @@ class CourseController extends Controller
 
         dd($chapter->toArray());
     }
+
+    public function sync(Course $course)
+    {
+        $course->chapters->each->update(['sync_offline' => 1]);
+        return redirect(route('course.index', ['course' => $course]));
+    }
+
 }