我正在嘗試檢查當(dāng)前登錄的用戶是否是管理員，然后允許他們?cè)L問(wèn)管理頁(yè)面，否則返回主頁(yè)。這是我的觀點(diǎn).pyfrom django.shortcuts import render, redirectfrom django.http import HttpResponsefrom django.contrib.auth import login, logout, authenticatefrom django.contrib import messagesfrom teacher.models import usersdef login(request):    if request.method == "POST":        username = request.POST['username']        password = request.POST['password']        user = authenticate(username = username, password = password)        if user is not None:            login(request, user)            print (user)            messages.success(request, "You have successfully Logged In.")            return redirect('index')        else:            messages.error(request, "You have entered invalid credentials. Please try again")            return redirect('login')    else:        return render(request, 'main/login.html')        def admin(request):    user = users.objects.get(category = 'admin')    if user:        return render(request, 'main/admin.html')    elif Exception:        return render(request, 'main/home.html')        這是我的 models.pyclass users(models.Model):    _id = models.AutoField    name = models.CharField(max_length = 100)    username = models.CharField(max_length = 100)    email = models.EmailField(max_length=254)    hpassword = models.CharField(max_length = 255)    category = models.CharField(max_length=50, default= "teacher")我嘗試過(guò)使用不同的查詢方法。但我最終收到錯(cuò)誤頁(yè)面，因?yàn)椤坝脩羝ヅ洳樵儾淮嬖凇?。它也不檢查用戶是否登錄。即使用戶未登錄，它也會(huì)返回到管理頁(yè)面。