我正在制作一个智力竞赛应用程序，为了计算结果，我编写了逻辑。。如果存储在问题模型中的答案值等于用户选择的答案，那么当用户提交每个问题时，分数都会增加一，但我未能建立这个逻辑，因为我是django的新用户，请帮助。
Models.py：问题及其4个选项，正确答案在问题模型中(这些字段由通过填写表格创建测验的用户输入(。用户提交的答案在答案模型中(此字段由参加测验的用户输入(。分数存储在结果模型中。
from django.db import models
from django.contrib.auth.models import User
from django.conf import settings
class quiztitle(models.Model):
Quiz_id = models.AutoField(primary_key=True)
Quiz_title = models.CharField(max_length=600)
User = settings.AUTH_USER_MODEL
User_id= models.ForeignKey(User, on_delete=models.CASCADE)
no_of_ques = models.IntegerField(default=10)
class question(models.Model):
Qid = models.AutoField(primary_key=True)
User = settings.AUTH_USER_MODEL
User_id = models.ForeignKey(User,on_delete=models.CASCADE)
Quiz_id = models.ForeignKey(quiztitle,on_delete=models.CASCADE)
Qques = models.TextField()
Qoption1 = models.TextField()
Qoption2 = models.TextField()
Qoption3 = models.TextField()
Qoption4 = models.TextField()
QAnswer = models.TextField()
class answer(models.Model):
Ansid = models.AutoField(primary_key=True)
Qid = models.ForeignKey(question,on_delete=models.CASCADE)
Quiz_id = models.ForeignKey(quiztitle, on_delete=models.CASCADE)
User = settings.AUTH_USER_MODEL
User_id = models.ForeignKey(User, on_delete=models.CASCADE)
Answer = models.TextField()
class result(models.Model):
result = models.AutoField(primary_key=True)
Quiz_id = models.ForeignKey(quiztitle, on_delete=models.CASCADE)
User_id = models.ForeignKey(User, on_delete=models.CASCADE)
score = models.FloatField()
def __str__(self):
return str(self.pk)
这是views.py文件
from django.shortcuts import render,redirect,HttpResponseRedirect
from .models import question ,quiztitle ,answer ,result
from django.contrib.auth.models import User
from .forms import CreateUserForm
from django.contrib import messages
from django.contrib.auth import authenticate,login,logout
from django.contrib.auth.decorators import login_required
from .decorators import unauthenticated_user,allowed_users
from django.contrib.auth.models import Group
def home_page(request):
return render(request,'Home.html')
def forbidden(request):
return render(request,'error403.html')
@unauthenticated_user
def registerPage(request):
form = CreateUserForm()
if request.method == 'POST':
form = CreateUserForm(request.POST)
if form.is_valid():
user = form.save()
username = form.cleaned_data.get('username')
group = Group.objects.get(name='Student')
user.groups.add(group)
messages.success(request, 'account has been created successfully for username' + username)
return redirect('login')
context = {'form':form}
return render(request,'register.html',context)
@unauthenticated_user
def handle_login(request):
if request.method == 'POST':
username = request.POST.get('username')
password = request.POST.get('password')
user = authenticate(request, username=username, password=password)
if user is not None:
login(request,user)
if request.user.groups.filter(name="Teacher"):
return redirect('quizmaker')
else:
return redirect('student')
else:
messages.info(request, 'Incorrect Username or Password')
context = {}
return render(request, 'login.html', context)
def logoutUser(request):
logout(request)
return redirect('home')#redirect to login page
@login_required(login_url='home')
@allowed_users(allowed_roles=['Teacher','Head'])
def handle_quiz(request):
if request.method=="POST":
# get post parameters
Quiz_title = request.POST.get('Quiz_title')
Quiz_id = request.POST.get('Quiz_id')
no_of_ques = request.POST.get('no_of_ques')
Qid = request.POST.get('Qid')
Qques = request.POST.get('Qques')
Qoption1 = request.POST.get('Qoption1')
Qoption2 = request.POST.get('Qoption2')
Qoption3 = request.POST.get('Qoption3')
Qoption4 = request.POST.get('Qoption4')
QAnswer = request.POST.get('QAnswer')
title = quiztitle(Quiz_title=Quiz_title,Quiz_id=Quiz_id,no_of_ques=no_of_ques)
title.User_id=request.user
title.save()
detail = question(Qid=Qid,Qques=Qques,Qoption1=Qoption1,Qoption2=Qoption2,Qoption3=Qoption3,Qoption4=Qoption4,QAnswer=QAnswer)
detail.User_id=request.user
detail.Quiz_id = title
detail.save()
messages.success(request,'Your question has been added succesfully')
return HttpResponseRedirect('/quizmaker')
return render(request,"createquiz.html")
@login_required(login_url='login')
@allowed_users(allowed_roles=['Student'])
def handle_response(request):
if request.user.is_authenticated:
myuser = User.objects.all()
title = quiztitle.objects.all()
data = question.objects.all()
if request.method == 'POST':
Answer=request.POST.get('Answer')
response = answer(Answer=Answer)
response.User_id = request.user
response.Quiz_id = request.quiztitle
response.Qid = request.question
Answer.save()
return HttpResponseRedirect('/student')
return render(request,"student.html",context={"messages": data ,"topic": title ,"user1": myuser})
def handle_result(request):
if request.user.is_authenticated:
quiz = quiztitle.objects.all()
ques = question.objects.all()
ans = answer.objects.all()
score = 0
if request.method == 'POST':
while(score<=quiz.no_of_ques):
if (ques.objects.QAnswer == ans.objects.Answer):
score += 1
print(score)
sc = request.POST('score')
res = result(sc=score)
res.User_id = request.user
res.Quiz_id = request.quiztitle
result.save()
return HttpResponseRedirect('/sample')
return render(request, "sample.html", context = {"ques":ques , "ans":ans})
在handle_result函数中，您有：
quiz = quiztitle.objects.all()
# ...
while(score<=quiz.no_of_ques):
这里的问题是：
quiz变量不是一个测试，而是所有测试。所以它不是一个实例，它是一个实例列表(从技术上讲，是实例的QuerySet(- 因此，不能调用
quiz.no_of_ques，因为quiz不是实例
这就是为什么会出现'QuerySet' object has no attribute 'no_of_ques'错误。要么查询一个特定实例，要么查询所有实例并在它们上循环。
在views.py handle_result函数中，
更换
quiz = quiztitle.objects.all()
带有
quizno = quiztitle.objects.values_list('no_of_ques', flat=True)
#....
while(score<=quizno):
它在查询一个实例(即no_of_ques (时解决了错误'QuerySet' object has no attribute 'no_of_ques'