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Upload fails on md5 calculation

I am trying to use this module in my project. I had to apply only one change in views to generate dataset_name on fly without asking for form field for it, so I replaced

dataset = self.get_or_create_dataset(request.POST.get('dataset_name'))

with

dataset_name = "dsname_%s" % chunk._get_name()
dataset = self.get_or_create_dataset(dataset_name)

But now, when view executes this line:

if chunked_upload.is_finished:

it fails in the model in this part:

    @property
    def md5(self):
        md5 = hashlib.md5()
        for chunk in self.file.chunks():
            md5.update(chunk)
        return md5.hexdigest()

particurarly at line

for chunk in self.file.chunks():

when he tries to loop over all chunks.

I tried this code with django-1.9.1 and also 1.11.2 and it is all the same.

I made some small changes to debug the problem:

@property
    def md5(self):
        print("f0")
        md5 = hashlib.md5()
        print(self.file)
        print(self.file.chunks())
        for chunk in self.file.chunks():
            print("f1")
            md5.update(chunk)
        print("f2")
        return md5.hexdigest()

and the output is