Django/Python: How to change filename when saving file using models.FileField? - django

Question

I found this example to upload a file using FileField and it works great.
https://simpleisbetterthancomplex.com/tutorial/2016/08/01/how-to-upload-files-with-django.html
Problem is that it saves the original filename of the file being uploaded. I don't want that. I can change the filename within models.py by overriding the save function (see below). For the life of me, I cannot figure out how to pass a filename in when I execute form.save() from views.py. I need to know the filename for another process. I thought about even returning a filename from the models.py save function. I'm a bit of a noob so forgive any missing details. I've searched this site and read loads of documentation, but I'm missing something. Any advice would be appreciated.
Forms.py
class DocumentForm(forms.ModelForm):
message = forms.CharField(widget=forms.Textarea(attrs={'rows': 5, 'cols': 50}))
class Meta:
model = Document
fields = ('description', 'document', )
Models.py
class Document(models.Model):
description = models.CharField(max_length=255, blank=True)
document = models.FileField(upload_to='atlasapp/documents/')
uploaded_at = models.DateTimeField(auto_now_add=True)
def save(self, *args, **kwargs):
randomNum = random.randint(10000,90000)
new_name = str(randomNum) + ".txt"
self.document.name = new_name
super(Document, self).save(*args, **kwargs)
Views.py
def model_form_upload(request):
if request.method == 'POST':
form = DocumentForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return redirect('model_form_upload')
else:
form = DocumentForm()
return render(request, 'model_form_upload.html', {'form': form})

Answer 1

Could you perhaps call save() on the form with commit=False, set the name on the Document file, and then save the Document? For example:
def model_form_upload(request):
if request.method == 'POST':
form = DocumentForm(request.POST, request.FILES)
if form.is_valid():
document = form.save(commit=False)
document.name = 'some_new_name'
document.save()
return redirect('model_form_upload')
else:
form = DocumentForm()
return render(request, 'model_form_upload.html', {'form': form})