Hi! I need to resize and make a stamp on uploaded images and only then
save a model.
I have a procedure, that processes incoming File:
def processUploadedImage(file):
img = Image.open(file)
downsampleUploadedimage(img)
stampUploadedImage(img)
img.save(file, "JPEG")
I tried to process UploadedFile directly from request.FILES, before
constructing and validating form:
...
processUploadedImage(request.FILES['file'])
form = ImageUpload(request.POST, request.FILES)
if form.is_valid(): #it always fails here, is_valid returns False,
if
I process UploadedFile
...
else:
redirect('/failed')
...
After it failed, I also tried to process it in my ImageUpload.save()
method:
class ImageUpload(forms.ModelForm):
class Meta:
model = Image
fields = ["title", "file"]
def save(self,user,commit=True,**params):
image = forms.ModelForm.save(self,commit=False)#construct an
instance from form fields
processUploadedImage(image.file)
...another fields initialization, such as user,
publication_date and
so on...
#save into db(if commit is True) and return model instance
return forms.models.save_instance(self, image,
commit,construct=False)
but it fails, when processUploadedImage tries to save image into file.
It trows IOError "Bad file descriptor"..
I know that I can process image after it saved into db, but I dont
want server to do unnecessary work:
read full sized file, copy it into storage, then again open file in
starage, process it, save...
I want beautyfull solution :)
Upload -> Process ->Construct model -> Save
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