AttributeError: 'Subject' object has no attribute 'file' when upload file in Django

Question

i 'm trying tp upload a file in Django use ImageField. I want to hash this img before upload (using ImageHash), and save the image with the hashed file name. Below is my code, can you helo me fix this?

models.py

 from utils import hash_image
 ...
 class: Subject(models.Model):
     photo = models.ImageField(upload_to=hash_image)
 ...

utils

    def hash_image(instance, filename):
        instance.file.open()
        ext = os.path.splitext(filename)[1]
        image_hash = ''
        image_hash = str(imagehash.average_hash(instance.file)) + '.' + ext
        return image_hash

Error:

line 34, in hash_image
        instance.file.open()
    AttributeError: 'Subject' object has no attribute 'file'

Instance is your model instance, not the photo field. – Jul 15 '20 at 12:31 — , Jul 15 '20 at 12:31
@Melvyn thank for your information, what should i to do? – hajuha Jul 15 '20 at 12:32 — hajuha, Jul 15 '20 at 12:32

score 1 · Accepted Answer · answered Jul 15 '20 at 12:57

1

You basically need something like this. And to address your error: your file is instance.photo not instance.file.

But I'm not sure it can work with imagehash, because UploadedFile is not a file-like object. In particular Image.Open requires that the object implements seek() and UploadedFile does not do this. I don't see a way to construct an Image object here that imagehash will be able to use, but maybe somebody else can.

answered Jul 15 '20 at 12:57

Based on your answer, I have fixed it as follows: ```img = Image.open(instance.photo) image_hash = str(imagehash.average_hash(img))``` Luckily, it worked – hajuha Jul 15 '20 at 13:35
Wow, then I guess it doesn't use `seek()` for this workload. :D – Jul 15 '20 at 13:37

AttributeError: 'Subject' object has no attribute 'file' when upload file in Django

1 Answers1