Django Filefield在model.save时出现UnicodeDecodeError

Question

在StackOverflow上没有找到和我一样的问题，只有一个链接http://qnundrum.com/question/766895，但没有人回答。我现在用的是Python 3.3和Django 1.6，通常情况下，Unicode的相关问题都是自动处理的。希望能得到一些帮助。

我想把自动生成的电子书保存到我的数据库里，以便以后能取出来。有些书里包含非ASCII字符。我已经搞定了生成的部分，.mobi和.epub格式的文件都能正常工作。这是我的models.py文件：

class StoryDownload(models.Model):
    text = models.OneToOneField('stories.Story', primary_key=True, related_name='downloads')
    epub = models.FileField(upload_to='epub/', blank=True, null=True)
    mobi = models.FileField(upload_to='mobi/', blank=True, null=True)

    def update_downloads(self):
        #code to generate epub and mobi files from text
        ...
        self.epub = File(open('filename.epub'), 'r'))
        self.mobi = File(open('filename.mobi'), 'r'))
        self.save()
        ...

我在调用self.save()时遇到了错误，这让我很困惑；如果这些文件被接受为Django的文件对象，那为什么我就不能保存它们呢？

错误追踪信息：

File "C:\Users\Chris\Envs\stories\lib\site-packages\django\core\handlers\base.py" in get_response
  114.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\views\generic\base.py" in view
  69.             return self.dispatch(request, *args, **kwargs)
File "C:\Users\Chris\Envs\stories\lib\site-packages\braces\views\_access.py" in dispatch
  64.             request, *args, **kwargs)
File "C:\Users\Chris\Envs\stories\lib\site-packages\guardian\mixins.py" in dispatch
  190.             **kwargs)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\views\generic\base.py" in dispatch
  87.         return handler(request, *args, **kwargs)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\views\generic\edit.py" in post
  228.         return super(BaseUpdateView, self).post(request, *args, **kwargs)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\views\generic\edit.py" in post
  171.             return self.form_valid(form)
File "C:\Users\Chris\Envs\stories\dev\akrito\chapters\views.py" in form_valid
  69.         self.chapter.story.save()
File "C:\Users\Chris\Envs\stories\dev\akrito\stories\models.py" in save
  87.             self.downloads.update_downloads()
File "C:\Users\Chris\Envs\stories\dev\akrito\stories\models.py" in update_downloads
  135.         self.save()
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\db\models\base.py" in save
  545.                        force_update=force_update, update_fields=update_fields)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\db\models\base.py" in save_base
  573.             updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\db\models\base.py" in _save_table
  632.                       for f in non_pks]
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\db\models\base.py" in <listcomp>
  632.                       for f in non_pks]
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\db\models\fields\files.py" in pre_save
  252.             file.save(file.name, file, save=False)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\db\models\fields\files.py" in save
  86.         self.name = self.storage.save(name, content)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\core\files\storage.py" in save
  49.         name = self._save(name, content)
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\core\files\storage.py" in _save
  203.                         for chunk in content.chunks():
File "C:\Users\Chris\Envs\stories\lib\site-packages\django\core\files\base.py" in chunks
  76.             data = self.read(chunk_size)
File "C:\Users\Chris\Envs\stories\lib\encodings\cp1252.py" in decode
  23.         return codecs.charmap_decode(input,self.errors,decoding_table)[0]

Exception Type: UnicodeDecodeError at /stories/2/1/e/
Exception Value: 'charmap' codec can't decode byte 0x81 in position 123: character maps to <undefined>

database django error handling ascii models filefield unicodedecodeerror ebook

Django Filefield在model.save时出现UnicodeDecodeError

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