/**
  * Show the index page for all staff.
  * Responds to requests to GET /staff
  *
  * @return Response
  */
 public function index()
 {
     if (Auth::user()->is_admin) {
         $centreStaff = Staff::all();
     } else {
         $centreStaff = Staff::ofCentres(Auth::user())->get();
     }
     return view('staff.index', compact('centreStaff'));
 }
 /**
  * Handle an incoming request.
  *
  * @param  \Illuminate\Http\Request  $request
  * @param  \Closure  $next
  * @return mixed
  */
 public function handle($request, Closure $next)
 {
     if (!$this->auth->user()->is_admin) {
         // All staff that belongs to the centres that the authenticated user is in charge of
         $centreStaff = collect(Staff::ofCentres($this->auth->user())->get()->lists('staff_id'));
         // Redirect user if staff profile accessed is not in list
         if (!$centreStaff->contains($request->route()->parameter('staff'))) {
             return redirect('/staff');
         }
     }
     return $next($request);
 }