Django：表单处理错误。处理与另一个模型关联的表单

Question

我希望能够为教师提交评论。我有 2 个模型：

models.py

class Teacher(models.Model):
    user = models.OneToOneField(User, on_delete=models.PROTECT, related_name='Teacher')

class Review(models.Model):
    teacher = models.ForeignKey(Teacher)
    #other fields

    def __str__(self):
        return self.name

forms.py

class ReviewForm(forms.ModelForm):
    class Meta:
        model = Review
        #Note no 'teacher' in fields below
        fields = ('title','star','body')

views.py 我有以下表单处理：

def teacher_view(request,**kwargs):
    teacher = Teacher.objects.get(pk=kwargs['pk'])
    #if request.method == 'POST':
    #handle the form
    review_form = ReviewForm(request.POST, instance=teacher)
    review_form.teacher=teacher
    if review_form.is_valid():
         review_form.save()
         return redirect('users:index')
    else:

出于某种原因，我似乎也得到了 else 循环。例如。表格无效。

Urls.py

url(r'^(?P<pk>[0-9]+)/$', views.teacher_view, name='detail')

---

Full Views.py

def teacher_profile(request, **kwargs):
    teacher = Teacher.objects.get(pk=kwargs['pk'])
    reviews = Review.objects.filter(teacher_id=kwargs['pk'])
    star = Review.objects.filter(teacher_id=kwargs['pk']).aggregate(Avg('star'))
    no_of_ratings = Review.objects.filter(teacher_id=kwargs['pk']).count()

    if request.method == "POST":
        if 'booking' in request.POST:
            form = BookingForm(request.POST)
            if form.is_valid():
                #handle the form
                return redirect('users:index')
            else:
                review_form = ReviewForm()
        elif 'review' in request.POST:
            review_form = ReviewForm(request.POST)
            review_form['teacher']=teacher
            if review_form.is_valid():
                review_form.save()
                return redirect('users:index')
            else:
                form = BookingForm()
        else:
            form = BookingForm()
            review_form = ReviewForm()
    else:
        form = BookingForm()
        review_form = ReviewForm()

    return render(request, "users/teacher_detail.html", context={"form": form,
                                                                 "review_form":review_form,
                                                                 "teacher":teacher,
                                                                 "reviews":reviews,
                                                                 "star":star,
                                                                 "no_of_ratings":no_of_ratings,
                                                                 })

我再次添加了代码。我已经从我的views.py 中复制粘贴了它，但是删除了我只定义变量并重定向到另一个页面并显示成功消息的表单处理。

我认为为什么您的答案中的逻辑是错误的，因为它首先检查表单是否有效，这是无效的，因为缺少老师。然后我们在检查它是否有效之后定义教师。我尝试通过在form.is_valid() 之前添加review_form['teacher']=teacher 来操作代码，但总是得到错误：

'ReviewForm' 对象不支持项目分配

Answer 1

如果 ReviewForm 有效，您似乎想添加教师：

def teacher_profile(request,**kwargs):
    teacher = Teacher.objects.get(pk=kwargs['pk'])
    reviews = teacher.review_set.all()
    star = reviews.aggregate(Avg('star'))
    no_of_ratings = reviews.count()

    form = BookingForm()
    review_form = ReviewForm()

    if request.method == "POST":
        if 'booking' in request.POST:
            form = BookingForm(request.POST)
            if form.is_valid():
                #Correct handling
                return redirect('users:index')
        elif 'review' in request.POST:
            review_form = ReviewForm(request.POST)
            if review_form.is_valid():
                review = review_form.save(commit=False)
                review.teacher = teacher
                review.save()
                return redirect('users:index')
    context = {
       "form":form,
       "review_form":review_form,
       "teacher":teacher,
       "reviews":reviews,
       "star":star,
       "no_of_ratings":no_of_ratings,})
    return render(request, "users/teacher_detail.html", context)

在teacher_detail.html添加，

{{ review_form.errors }}