Django - Getting PIL Image save method to work with Amazon s3boto Storage - django

Question

In order to resize images upon upload (using PIL), I'm overriding the save method for my Article model like so:
def save(self):
super(Article, self).save()
if self.image:
size = (160, 160)
image = Image.open(self.image)
image.thumbnail(size, Image.ANTIALIAS)
image.save(self.image.path)
This works locally but in production I get an error:
NotImplementedError: This backend doesn't support absolute paths.
I tried replacing the image.save line with
image.save(self.image.url)
but then I get an IOError:
[Errno 2] No such file or directory: 'https://my_bucket_name.s3.amazonaws.com/article/article_images/2.jpg'
That is the correct location of the image though. If I put that address in the browser, the image is there. I tried a number of other things but so far, no luck.

Answer 1

You should try and avoid saving to absolute paths; there is a File Storage API which abstracts these types of operations for you.
Looking at the PIL Documentation, it appears that the save() function supports passing a file-like object instead of a path.
I'm not in an environment where I can test this code, but I believe you would need to do something like this instead of your last line:
from django.core.files.storage import default_storage as storage
fh = storage.open(self.image.name, "w")
format = 'png' # You need to set the correct image format here
image.save(fh, format)
fh.close()

Answer 2

For me default.storage.write() did not work, image.save() did not work, this one worked. See this code if anyone is still interested. I apologize for the indentation. My project was using Cloudinary and Django small project.
from io import BytesIO
from django.core.files.base import ContentFile
from django.core.files.storage import default_storage as storage
def save(self, *args, **kargs):
super(User, self).save(*args, **kargs)
# After save, read the file
image_read = storage.open(self.profile_image.name, "r")
image = Image.open(image_read)
if image.height > 200 or image.width > 200:
size = 200, 200
# Create a buffer to hold the bytes
imageBuffer = BytesIO()
# Resize
image.thumbnail(size, Image.ANTIALIAS)
# Save the image as jpeg to the buffer
image.save(imageBuffer, image.format)
# Check whether it is resized
image.show()
# Save the modified image
user = User.objects.get(pk=self.pk)
user.profile_image.save(self.profile_image.name, ContentFile(imageBuffer.getvalue()))
image_read = storage.open(user.profile_image.name, "r")
image = Image.open(image_read)
image.show()
image_read.close()

Answer 3

If you are working with cloud storages for files in Django
NotImplementedError: This backend doesn't support absolute paths
To fix it you need to replace file.path with file.name
For code in the the question: image.save(self.image.path) with image.save(self.image.name)
Here how it looks like in the console
>>> c = ContactImport.objects.last()
>>> c.json_file.name
'protected/json_files/data_SbLN1MpVGetUiN_uodPnd9yE2prgeTVTYKZ.json'
>>> c.json_file
<FieldFile: protected/json_files/data_SbLN1MpVGetUiN_uodPnd9yE2prgeTVTYKZ.json>
>>> c.json_file.url
'https://storage.googleapis.com/super-secret/media/api/protected/json_files/data_SbLN1MpVGetUiN_uodPnd9yE2prgeTVTYKZ.json?Expires=1631378947&GoogleAccessId=secret&Signature=ga7...'