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

Question

I have a form where a user can submit some text, which then gets saved to the model TextSubmission .

However, it only saves when I take out instance=request.user from views.py and it does not save with the instance of the user who submitted it.

If I leave instance=request.user in, the request.POST object does not get saved but does get posted. (I can see from print(request.POST)

Can someone help me figure out why this is and how to get the text to save along with the user?

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

You're passing the TextSubmission form an instance of User, when you want to be passing it an instance of TextSubmission. Try

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

Answer 2

Override the __init__() method and save() method of the form as

class TextSubmissionForm(forms.ModelForm):
    

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

Then, in your views,

def profile_view(request):
    if request.method == 'POST':
        

        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:
        

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

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

---

Reference

1. Passing a user, request to forms

Answer 3

The instance require the instance of the referenced model in form definition. In your case it is TextSubmission , so you have first get object of this model and then pass it to the TextSubmissionForm

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

Same case for UserUpdateForm