I am getting an internal server error for one of my view functions in Django that takes an image file and saves it to one of my models. The view function works in development, but is giving me an internal server error in production. I tried to wrap the part of the code that is failing in a try/except block, but the exception that it logs just says '__exit__' I'm not really sure what this means, or what kind of exception it is. I tried looking up what that exception would mean, but couldn't find anything. Does it have something to do with opening the file, and having issues closing it ? The exact part of the view function that breaks is where it says ...
if name == 'one':
trade_in.photo_one = file
View
def edit_photos(request):
trade_in = account_trade_in(request)
if not trade_in:
return HttpResponse(json.dumps({'error': 'Something went wrong, unable to edit photos'}), content_type='application/json')
if request.method == 'POST':
try:
file = request.FILES['file']
name = request.POST['photo']
if name == 'one':
trade_in.photo_one = file
elif name == 'two':
trade_in.photo_two = file
elif name == 'three':
trade_in.photo_three = file
elif name == 'four':
trade_in.photo_four = file
elif name == 'five':
trade_in.photo_five = file
elif name == 'six':
trade_in.photo_six = file
trade_in.save()
except Exception as e:
logging.error(e)
return HttpResponse(json.dumps({'error': e}), content_type='application/json')
json_trade_in = json.dumps(trade_in.get_json())
return HttpResponse(json_trade_in, content_type='application/json')
Model
class TradeInDetails(models.Model):
account = models.OneToOneField(Account)
photo_one = StdImageField(upload_to=UploadToClassNameDirUUID(), blank=True, null=True,
variations={'thumbnail': (120, 120, True)})
photo_two = StdImageField(upload_to=UploadToClassNameDirUUID(), blank=True, null=True,
variations={'thumbnail': (120, 120, True)})
photo_three = StdImageField(upload_to=UploadToClassNameDirUUID(), blank=True, null=True,
variations={'thumbnail': (120, 120, True)})
photo_four = StdImageField(upload_to=UploadToClassNameDirUUID(), blank=True, null=True,
variations={'thumbnail': (120, 120, True)})
photo_five = StdImageField(upload_to=UploadToClassNameDirUUID(), blank=True, null=True,
variations={'thumbnail': (120, 120, True)})
photo_six = StdImageField(upload_to=UploadToClassNameDirUUID(), blank=True, null=True,
variations={'thumbnail': (120, 120, True)})
lender = models.CharField(max_length=255, null=True, blank=True)
amount_owed = models.CharField(max_length=255, null=True, blank=True)
year = models.CharField(max_length=255, null=True, blank=True)
mileage = models.CharField(max_length=255, null=True, blank=True)
make = models.ForeignKey('vehicle.VehicleMake', null=True, blank=True)
model = models.ForeignKey('vehicle.VehicleModel', null=True, blank=True)
class Meta:
verbose_name = 'Trade In Photos'
verbose_name_plural = 'Trade In Photos'
Full Stack Trace
Traceback (most recent call last):
File "/home/socialauto/social-auto-web/account/ajax_views.py", line 553, in edit_photos
trade_in.save()
File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py", line 708, in save
force_update=force_update, update_fields=update_fields)
File "/usr/local/lib/python3.4/dist-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 "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py", line 798, in _save_table
for f in non_pks]
File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py", line 798, in <listcomp>
for f in non_pks]
File "/usr/local/lib/python3.4/dist-packages/django/db/models/fields/files.py", line 311, in pre_save
file.save(file.name, file, save=False)
File "/home/socialauto/social-auto-web/third_party/stdimage/models.py", line 48, in save
self.render_variations()
File "/home/socialauto/social-auto-web/third_party/stdimage/models.py", line 58, in render_variations
self.render_variation(self.name, variation, replace, self.storage)
File "/home/socialauto/social-auto-web/third_party/stdimage/models.py", line 76, in render_variation
with Image.open(f) as img:
AttributeError: __exit__
Standard Image Model Method Throwing Error
@classmethod
def render_variation(cls, file_name, variation, replace=False,
storage=default_storage):
"""Render an image variation and saves it to the storage."""
variation_name = cls.get_variation_name(file_name, variation['name'])
if storage.exists(variation_name):
if replace:
storage.delete(variation_name)
logger.info('File "{}" already exists and has been replaced.')
else:
logger.info('File "{}" already exists.')
return variation_name
resample = variation['resample']
with storage.open(file_name) as f:
with Image.open(f) as img:
save_kargs = {}
file_format = img.format
if cls.is_smaller(img, variation):
factor = 1
while img.size[0] / factor \
> 2 * variation['width'] \
and img.size[1] * 2 / factor \
> 2 * variation['height']:
factor *= 2
if factor > 1:
img.thumbnail(
(int(img.size[0] / factor),
int(img.size[1] / factor)),
resample=resample
)
size = variation['width'], variation['height']
size = tuple(int(i) if i != float('inf') else i
for i in size)
if file_format == 'JPEG':
# http://stackoverflow.com/a/21669827
img = img.convert('RGB')
save_kargs['optimize'] = True
save_kargs['quality'] = 'web_high'
if size[0] * size[1] > 10000: # roughly <10kb
save_kargs['progressive'] = True
if variation['crop']:
img = ImageOps.fit(
img,
size,
method=resample
)
else:
img.thumbnail(
size,
resample=resample
)
with BytesIO() as file_buffer:
img.save(file_buffer, file_format, **save_kargs)
f = ContentFile(file_buffer.getvalue())
storage.save(variation_name, f)
return variation_name
