Django: resize image before upload

i want to resize image(Pillow) before upload, i write below code but not work!
and get error:

AttributeError at /myapp/list/

_committed

Request Method: POST

Request URL: http://127.0.0.1:8000/myapp/list/
Django Version: 1.8 Exception Type: AttributeError Exception Value:

_committed

Exception Location:

/usr/local/lib/python3.4/dist-packages/Pillow-2.8.1-py3.4-linux-x86_64.egg/PIL/Image.py

in getattr, line 622 Python Executable: /usr/bin/python3.4 Python
Version: 3.4.0

views.py

def list(request):
# Handle file upload
if request.method == 'POST':
    form = DocumentForm(request.POST, request.FILES)
    if form.is_valid():
        imga = request.FILES['docfile']
        size = (600, 400)
        im = Image.open(imga)
        imga = im.resize(size)
        request.FILES['docfile'] = imga
        newdoc = Document(docfile = request.FILES['docfile'], namefile=request.POST['namefile'])
        newdoc.save()

        # Redirect to the document list after POST
        return HttpResponseRedirect(reverse('myproject.myapp.views.list'))
else:
    form = DocumentForm() # A empty, unbound form

# Load documents for the list page
documents = Document.objects.all()

# Render list page with the documents and the form
return render_to_response(
    'myapp/list.html',
    {'documents': documents, 'form': form},
    context_instance=RequestContext(request)
)


Source: python

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