Bild kann nicht speichern Modell

Question

django Ich versuche Bild, um die Größe, bevor Sie speichern:

from PIL import Image 


class UserAvatarUpdate(views.APIView): 


    serializer_class = UserSerializer 

    def patch(self, *args, **kwargs): 

     instance = ExtUser.objects.get(id=self.request.user.id) 

     instance.avatar = self.request.FILES['file'] 

     size = 100,100 

     filename = instance.avatar.path 

     image = Image.open(filename) 

     image = image.resize(size,Image.ANTIALIAS) 

     instance.avatar = image 

     instance.save() 
     return Response(
      UserSerializer(instance).data, 
      status=status.HTTP_200_OK 
     ) 

aber ich habe den Fehler unten sparen:

> Internal Server Error: /api/v1/update_user_avatar/ Traceback (most 
> recent call last): File 
> "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/core/handlers/base.py", 
> line 149, in get_response 
>  response = self.process_exception_by_middleware(e, request) File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/core/handlers/base.py", 
> line 147, in get_response 
>  response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/views/decorators/csrf.py", 
> line 58, in wrapped_view 
>  return view_func(*args, **kwargs) File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/views/generic/base.py", 
> line 68, in view 
>  return self.dispatch(request, *args, **kwargs) File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/rest_framework/views.py", 
> line 466, in dispatch 
>  response = self.handle_exception(exc) File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/rest_framework/views.py", 
> line 463, in dispatch 
>  response = handler(request, *args, **kwargs) File "/home/alexandr/sprutlabs_python/sprutlabs/posts/views.py", line 123, 
> in patch 
>  instance.save() File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/contrib/auth/base_user.py", line 74, in save 
>  super(AbstractBaseUser, self).save(*args, **kwargs) File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/db/models/base.py", 
> line 708, in save 
>  force_update=force_update, update_fields=update_fields) File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/db/models/base.py", 
> line 736, in save_base 
>  updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) File 
> "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/db/models/base.py", 
> line 798, in _save_table 
>  for f in non_pks] File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/db/models/base.py", 
> line 798, in <listcomp> 
>  for f in non_pks] File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/django/db/models/fields/files.py", line 309, in pre_save 
>  if file and not file._committed: File "/home/alexandr/sprutlabs_python/lib/python3.4/site-packages/PIL/Image.py", 
> line 632, in __getattr__ 
>  raise AttributeError(name) AttributeError: _committed 

mein Modell:

avatar = models.ImageField(
     'Аватар', 
     blank=True, 
     null=True, 
     upload_to="user/avatar" 
    ) 

Answer 1

Sie können ein PIL-Bild nicht direkt so einer-988-zuweisen. Sie benötigen eine kleine Problemumgehung:

from io import BytesIO 
from django.core.files.base import ContentFile 

image = Image.open(filename) 
image = image.resize(size,Image.ANTIALIAS) 

image_io = BytesIO() 
image.save(image_io, format='jpeg', quality=80) # you can change format and quality 

# save to model 
image_name = "my_image" 
instance.avatar.save(image_name, ContentFile(image_io.getvalue()))