how to write the corresponding "handle_uploaded_file" for the model field and form?

attachment = models.FileField(upload_to='file/upload/question/%Y-%m-%d', verbose_name='attachment', null=True, blank=True,)

def handle_uploaded_file 开发者_C百科(file_, user):
    filename = "%s-%s" % (user.username , file_.name)
    path = "%s/file/upload/question/%s/%s" % (settings.MEDIA_ROOT, user.username, filename)
    if not os.path.exists (path): 
        os.makedirs(path)
    f = path + file.name
    fd = open(f, 'wb+')
    for chunk in file.chunks():
        fd.write(chunk)
    fd.close()

i don't know how to write the path and the following code?

def submit_question(request):
    current_user = request.user
    url = '/question/list_questions/'

    if request.method == 'POST':
        form = QuestionForm(request.POST, request.FILES)
        if form.is_valid():
            handle_uploaded_file(request.FILES['attachment'], current_user)  

            new_question = Question(question = form.cleaned_data['question'],
                                    question_type= form.cleaned_data['question_type'],
                                    country = form.cleaned_data['country'], 
                                    submitter = form.cleaned_data['submitter'],
                                    is_private = form.cleaned_data['is_private'],
                                    #attachment = temp_attachment,
                                    )
            new_question.save()

            return HttpResponseRedirect(url)
    else:
        form = QuestionForm()

    context = {'form': form,}
    context.update(csrf(request))
    return render_to_response('question/submit.html', context)

Why do you want to handle file attachments by yourself, django will do it for you.

Properties of FileField is here. I uesd it a few times before, i can not remember exactly butusing something as following must do the job...

First, create your form from related model:

class SomeFormWithFileForm(forms.ModelForm):
class Meta:
    model = SomeModel

then in your view, where you create your form instance,

form = SomeFormWithFileForm(request.POST, request.FILES)
if form.is_valid():
    form.save()

will do the trick.