django-sorl 使用模板语法时产生 IOError

Question

我设置了django-sorl，但我觉得我可能忽略了一些简单的东西。我一直收到以下错误信息（TEMPLATE_DEBUG = True 和 THUMBNAIL_DEBUG = True）

请求方法：GET 请求网址： http://localhost:8000/events/edit/1

Django版本：1.2.4 异常类型： TemplateSyntaxError 异常值：

在渲染时捕获到IOError： (2, '没有这样的文件或目录')

异常位置： /usr/lib/python2.6/site-packages/django/core/files/storage.py 的_open，第137行

Python可执行文件： /usr/bin/python Python版本： 2.6.4

我正在运行一个redis服务器... 我的sorl配置是：

settings.py -省略-：

TEMPLATE_DEBUG = DEBUG
THUMBNAIL_DEBUG = DEBUG
THUMBNAIL_KVSTORE = 'sorl.thumbnail.kvstores.redis_kvstore.KVStore'
INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'sorl.thumbnail',
)

models.py -省略-：

from sorl.thumbnail import ImageField
...
    path = ImageField(
       _('Image'),
        upload_to='event/%Y/%m/%d/%H',
    )
...

template.html -省略-：

{% load thumbnail %}
...
{% thumbnail image "200x100" as im %}
    <img src="{{ im.url }}" alt="{{ im.name }}"/>
{% endthumbnail %}
...

我觉得我快解决了，因为在缓存文件夹里确实有文件被创建

sh> find static/cache/ -type f 
static/cache/db/ac/dbac605942d9651eb25f16cf05f5e672.jpg
static/cache/82/bc/82bcdd2ab079187c6b6110cb0e0c1505.jpg
static/cache/07/77/077784411739d4f8b1758255783388ec.jpg

当我打开这些文件时，它们是我按需请求的图片。看起来在尝试打开图片以显示时出错了。还有一点要注意的是，如果我只是用以下语法显示图片，它就能正常工作（没有使用sorl）：

正常工作的template.html（没有sorl，所以...没有缩略图） -省略-：

<img src="{{ MEDIA_URL}}{{ image.path }}" alt="{{ image.name }}"/>

关键是；我确实需要在图片前加上{{ MEDIA_URL }}标签才能显示（我不确定这是否与我在使用sorl时遇到的错误有关，还是只是个误导）。

最后，关于原始错误的一些小细节（它们来自生成的TemplateSyntaxError页面 - 最后5条）。

# /var/project/src/lib/sorl/thumbnail/base.py in get_thumbnail

  36. thumbnail = ImageFile(name, default.storage)
  37. cached = default.kvstore.get(thumbnail)
  38. if cached:
  39. return cached
  40. if not thumbnail.exists():
  41. # We have to check exists() because the Storage backend does not
  42. # overwrite in some implementations.
  43. source_image = default.engine.get_image(source) ...
  44. # We might as well set the size since we have the image in memory
  45. size = default.engine.get_image_size(source_image)
  46. source.set_size(size)
  47. self._create_thumbnail(source_image, geometry_string, options,
  48. thumbnail)
  49. # If the thumbnail exists we don't create it, the other option is

▼ Local vars Variable Value cached None file_ <EventImage: TestImage> geometry_string u'200x100' key 'format' name 'cache/24/69/246986cc89951f1d37235b8f0dec0a54.jpg' options {'colorspace': 'RGB', 'crop': False, 'format': 'JPEG', 'quality': 95, 'upscale': True} self    <sorl.thumbnail.base.ThumbnailBackend object at 0x7f5b885f2c10> source <sorl.thumbnail.images.ImageFile object at 0x7f5b885c81d0> thumbnail <sorl.thumbnail.images.ImageFile object at 0x7f5b8867f510> value 'JPEG'
# /var/project/src/lib/sorl/thumbnail/engines/pil_engine.py in get_image

   5. from PIL import Image, ImageDraw
   6. except ImportError:
   7. import Image, ImageDraw
   8.
   9.
  10. class Engine(EngineBase):
  11. def get_image(self, source):

  12. buf = StringIO(source.read()) ...

  13. return Image.open(buf)
  14.
  15. def get_image_size(self, image):
  16. return image.size
  17.
  18. def dummy_image(self, width, height):

▼ Local vars Variable Value self <sorl.thumbnail.engines.pil_engine.Engine object at 0x7f5b886cf450> source <sorl.thumbnail.images.ImageFile object at 0x7f5b885c81d0>
# /home/caronc/Development/cityattention/src/lib/sorl/thumbnail/images.py in read

 114. return self._size
 115.
 116. @property
 117. def url(self):
 118. return self.storage.url(self.name)
 119.
 120. def read(self):
 121. return self.storage.open(self.name).read() ...
 122.
 123. def write(self, content):
 124. if not isinstance(content, File):
 125. content = ContentFile(content)
 126. self._size = None
 127. return self.storage.save(self.name, content)

▼ Local vars Variable Value self <sorl.thumbnail.images.ImageFile object at 0x7f5b885c81d0>
# /usr/lib/python2.6/site-packages/django/core/files/storage.py in open

  25. # These shouldn't be overridden by subclasses unless absolutely necessary.
  26.
  27. def open(self, name, mode='rb', mixin=None):
  28. """
  29. Retrieves the specified file from storage, using the optional mixin
  30. class to customize what features are available on the File returned.
  31. """
  32. file = self._open(name, mode) ...
  33. if mixin:
  34. # Add the mixin as a parent class of the File returned from storage.
  35. file.__class__ = type(mixin.__name__, (mixin, file.__class__), {})
  36. return file
  37.
  38. def save(self, name, content):

▼ Local vars Variable Value mixin None mode 'rb' name u'TestImage' self      <django.core.files.storage.FileSystemStorage object at 0x7f5b8867f3d0>
# /usr/lib/python2.6/site-packages/django/core/files/storage.py in _open

 130. location = settings.MEDIA_ROOT
 131. if base_url is None:
 132. base_url = settings.MEDIA_URL
 133. self.location = os.path.abspath(location)
 134. self.base_url = base_url
 135.
 136. def _open(self, name, mode='rb'):
 137. return File(open(self.path(name), mode)) ...
 138.
 139. def _save(self, name, content):
 140. full_path = self.path(name)
 141.
 142. directory = os.path.dirname(full_path)
 143. if not os.path.exists(directory):

▼ Local vars Variable Value mode 'rb' name u'TestImage' self <django.core.files.storage.FileSystemStorage object at 0x7f5b8867f3d0>

我在谷歌上搜索这个错误没有成功；我希望我的问题只是个小问题，因为除了模板显示外，其他一切都正常。

django redis templates IOError thumbnail template syntax error sorl media url

django-sorl 使用模板语法时产生 IOError

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