public function index() { if (Auth::user()->hasRole("admin")) { $users = User::all(); $demands = Demand::all(); $bids = Bid::all(); $counts['user'] = count($users); $counts['demand'] = count($demands); $counts['bid'] = count($bids); return view('admin.index')->with('counts', $counts); } else { return redirect()->back()->withInput()->withErrors('您不是管理员,无法进行此操作。'); } }