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我在我的Django項目與化身領域的用戶模型：如何使靜態圖像的縮略圖使用SORL-縮略圖
class User(AbstractBaseUser):
avatar = models.ImageField(
null=True,
blank=True,
upload_to='user/avatar/',
)
不是必需的化身，所以我想用一個如果用戶尚未上傳默認圖片。在另一方面，我不想爲了使用default參數可以改變默認的頭像在未來爲所有用戶：
class User(AbstractBaseUser):
avatar = models.ImageField(
null=True,
blank=True,
default='defaults/no-avatar.png',
upload_to='user/avatar/',
)
所以我最後寫一個get_avatar方法返回一個圖像如果化身存在或默認的靜態圖像的路徑：
@property
def get_avatar(self):
if self.avatar:
return self.avatar
return '{0}defaults/no-avatar.png'.format(settings.STATIC_URL)
但在這種情況下sorl-thumbnail不生成縮略圖的默認圖像
{% thumbnail user.get_avatar "46x46" crop="center" as im %}
<img title="{{ user }}" src="{{ im.url }}" class="img-circle" />
{% endthumbnail %}
，並返回以下錯誤：
ERROR 2014-09-22 12:49:48,020 thumbnail :: Thumbnail tag failed:
Traceback (most recent call last):
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/templatetags/thumbnail.py", line 45, in render
return self._render(context)
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/templatetags/thumbnail.py", line 97, in _render
file_, geometry, **options
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/base.py", line 56, in get_thumbnail
source_image = default.engine.get_image(source)
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/engines/pil_engine.py", line 12, in get_image
buf = StringIO(source.read())
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/images.py", line 121, in read
return self.storage.open(self.name).read()
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/django/core/files/storage.py", line 33, in open
return self._open(name, mode)
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/django/core/files/storage.py", line 159, in _open
return File(open(self.path(name), mode))
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/django/core/files/storage.py", line 260, in path
raise SuspiciousFileOperation("Attempted access to '%s' denied." % name)
我試圖重寫方法，以便返回而不是圖像：
from django.core.files.images import ImageFile
@property
def get_avatar(self):
if self.avatar:
return self.avatar
return ImageFile(open(os.path.join(settings.STATIC_ROOT, 'defaults/no-avatar.png'), 'r'))
，但我有一個類似的錯誤：
ERROR 2014-09-22 12:52:18,448 thumbnail :: Thumbnail tag failed:
Traceback (most recent call last):
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/templatetags/thumbnail.py", line 45, in render
return self._render(context)
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/templatetags/thumbnail.py", line 97, in _render
file_, geometry, **options
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/base.py", line 56, in get_thumbnail
source_image = default.engine.get_image(source)
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/engines/pil_engine.py", line 12, in get_image
buf = StringIO(source.read())
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/sorl/thumbnail/images.py", line 121, in read
return self.storage.open(self.name).read()
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/django/core/files/storage.py", line 33, in open
return self._open(name, mode)
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/django/core/files/storage.py", line 159, in _open
return File(open(self.path(name), mode))
File "/Users/vera/.virtualenvs/my_app/lib/python2.7/site-packages/django/core/files/storage.py", line 260, in path
raise SuspiciousFileOperation("Attempted access to '%s' denied." % name)
SuspiciousFileOperation: Attempted access to '/Users/vera/workspace/my-website/static/defaults/no-avatar.png' denied.