update forms.FileField on django forms

问题

I have a model with a FileField in it:

class DocumentUpload(models.Model):
    document_name = models.CharField(max_length=100, blank=True)
    document_path = models.FileField(upload_to='uploads')

and a form which uses this model

class DocumentUploadForm(forms.ModelForm):
    class Meta:
        model = DocumentUpload

When I use the form to create a new upload everything works fine.

    if request.method == 'POST':
        form = DocumentUploadForm(request.POST, request.FILES)
        if form.is_valid():
            form.save()

However when I try and update/edit the entry it updates all the fields apart from the document which is uploaded. This just stays the same as the original upload.

d = get_object_or_404(DocumentUpload, pk=id)

if request.method == 'POST':
    form = DocumentUploadForm(data=request.POST, files=request.FILES, instance=d)
    if form.is_valid():
        u = form.save()

How do I get it to change the upload file when editing the instance?

Thanks

回答1:

Since it was my idea, I'll post it up as an answer (just to stroke my own ego and/or rating)...

Add the following to your form's template:

enctype="multipart/form-data"

feel free to check it off as an answer...

:)

回答2:

just needed to add:

enctype="multipart/form-data" 

to my form. Thanks Brant

来源：https://stackoverflow.com/questions/2719662/update-forms-filefield-on-django-forms