Question

我有一个表单，用户可以提交一些文本，然后将其保存到模型TextSubmission中。

但是，仅当我从instance=request.user中取出views.py时它才保存，并且不与提交它的用户实例一起保存。

如果我将instance=request.user留在其中，request.POST对象将不会保存，但会被发布。（我可以从print(request.POST)

有人可以帮我弄清楚为什么会这样以及如何与用户一起保存文本吗？

models.py

class TextSubmission(models.Model):
    text_submission    = models.CharField(max_length=50, null=True, blank=True)
    user                   = models.OneToOneField(User, on_delete=models.CASCADE)

    class Meta:
        ordering = ['text_submission']

    def __str__(self):
        return self.text_submission

forms.py

class TextSubmissionForm(forms.ModelForm):

    class Meta:
        model = TextSubmission
        fields = ['text_submission']

views.py

def profile_view(request):
    if request.method == 'POST':
        p_form = ProfileUpdateForm(request.POST, instance=request.user)
        t_form = TextSubmissionForm(request.POST, request.FILES, instance=request.user.profile)

        if p_form.is_valid() and t_form.is_valid():
            p_form.save()
            t_form.save()
            messages.success(request, f'Your account has been updated!')
            return redirect('profile')

    else:
        p_form = ProfileUpdateForm(instance=request.user.profile)
        t_form = TextSubmissionForm(instance=request.user.textsubmission)

    context = {
        'p_form': p_form,
        't_form': t_form,
    }

    return render(request, 'profile.html', context)

profile.html

<form method="POST" enctype="multipart/form-data">
  <div class="profile-form">
          {{ p_form }}
          {{ t_form }}
   </div>
   <button type="submit" value="submit">Update Profile</button>
</form>

Answer 1

您要从User的实例传递TextSubmission，而要向其传递TextSubmission实例。试试

try:
    t_form = TextSubmissionForm(request.POST, instance=request.user.textsubmission)
except TextSubmission.DoesNotExist:
    t_form = TextSubmissionForm(request.POST)

Answer 2

将表单的 __init__() 方法和 save() 方法覆盖为

class TextSubmissionForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user')
        super().__init__(*args, **kwargs)

    def save(self, commit=True):
        self.instance.user = self.user
        return super().save(commit)

    class Meta:
        model = TextSubmission
        fields = ['text_submission']

然后，在您看来，

def profile_view(request):
    if request.method == 'POST':
        u_form = UserUpdateForm(request.POST)  # change is here
        t_form = TextSubmissionForm(request.POST, user=request.user)  # change is here

        if u_form.is_valid() and t_form.is_valid():
            u_form.save()
            t_form.save()
            messages.success(request, f'Your account has been updated!')
            return redirect('profile')

    else:
        u_form = UserUpdateForm()  # change is here
        t_form = TextSubmissionForm()  # change is here

    context = {
        'u_form': u_form,
        't_form': t_form,
    }

    return render(request, 'profile.html', context)

参考

Passing a user, request to forms

Answer 3

实例需要表单定义中引用模型的实例。在您的情况下为TextSubmission，因此您首先要获得此模型的对象，然后将其传递给TextSubmissionForm

user = User.objects.get(id = request.user)
txtSubmsn = TextSubmission.objects.get(user)
u_form = TextSubmissionForm(instance=txtSubmsn)

与UserUpdateForm相同的情况

Django 2 request.POST未使用instance = request.user保存到数据库

3 个答案:

参考