在Django上传文件时出现OSError

Question

在尝试发送包含图片字段的表单时，我遇到了这个错误：
异常类型：OSError 在 /user/register/ 异常值：(13, '权限被拒绝')

当然，我首先检查了我的文件夹权限，出于保险起见，我把整个路径的权限设置成了777，从根目录开始。但还是没有解决问题。于是我尝试在设置中添加了一些参数，现在设置是这样的：

ADMIN_MEDIA_PREFIX  
'/site_media/admin/'
CACHE_BACKEND   
'locmem://'
DEFAULT_CHARSET     
'utf-8'
DEFAULT_CONTENT_TYPE    
'text/html'
DEFAULT_FILE_STORAGE    
'django.core.files.storage.FileSystemStorage'
FILE_CHARSET    
'utf-8'
FILE_UPLOAD_HANDLERS    
('django.core.files.uploadhandler.MemoryFileUploadHandler', 'django.core.files.uploadhandler.TemporaryFileUploadHandler')
FILE_UPLOAD_MAX_MEMORY_SIZE     
2621440
FILE_UPLOAD_PERMISSIONS     
777
FILE_UPLOAD_TEMP_DIR    
None
FS_ROOT     
'/home/rails/fandrive'
MEDIA_ROOT  
'/home/fandrive/www/fandrive/site_media'
MEDIA_URL   
'/site_media/'
PROJECT_PATH    
'/home/rails/fandrive'
SESSION_FILE_PATH   
None

请求的元信息：

CONTENT_LENGTH      
'8249'
CONTENT_TYPE    
'multipart/form-data; boundary=---------------------------26681719213985'
DOCUMENT_ROOT   
'/home/rails/fandrive/public'
HTTP_ACCEPT     
'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
HTTP_ACCEPT_CHARSET     
'ISO-8859-1,utf-8;q=0.7,*;q=0.7'
HTTP_ACCEPT_ENCODING    
'gzip,deflate'
HTTP_ACCEPT_LANGUAGE    
'en-us,en;q=0.5'
HTTP_CONNECTION     
'keep-alive'
HTTP_CONTENT_LENGTH     
'8249'
HTTP_CONTENT_TYPE   
'multipart/form-data; boundary=---------------------------26681719213985'
HTTP_HOST   
'example.com'
HTTP_KEEP_ALIVE     
'115'
HTTP_REFERER    
'http://example.com/user/register/'
HTTP_USER_AGENT     
'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6'
PATH_INFO   
u'/user/register/'
QUERY_STRING    
''
REMOTE_PORT     
'52869'
REQUEST_METHOD  
'POST'
REQUEST_URI     
'/user/register/'
SCRIPT_NAME     
u''
SERVER_PROTOCOL     
'HTTP/1.1'
SERVER_SOFTWARE     
'Apache'
_   
'_'
wsgi.errors     
<open file '<stderr>', mode 'w' at 0x7f2a6026f140>
wsgi.input  
<socket._fileobject object at 0x7f2a5cbc4848>
wsgi.multiprocess   
True
wsgi.multithread    
False
wsgi.run_once   
True
wsgi.url_scheme     
'http'
wsgi.version    
(1, 0)

最后，这是我的错误追踪信息：

Traceback:
File "/home/rails/fandrive/site-packages/django/core/handlers/base.py" in get_response
  92.                 response = callback(request, *callback_args, **callback_kwargs)
File "/home/rails/fandrive/registration/views.py" in register
  47.             new_user = backend.register(request, **form.cleaned_data)
File "/home/rails/fandrive/registration/backends/default/__init__.py" in register
  23.                                      request=request)
File "/home/rails/fandrive/site-packages/django/dispatch/dispatcher.py" in send
  166.             response = receiver(signal=self, sender=sender, **named)
File "/home/rails/fandrive/regbackend.py" in user_created
  39.     data.save() 
File "/home/rails/fandrive/site-packages/django/db/models/base.py" in save
  410.         self.save_base(force_insert=force_insert, force_update=force_update)
File "/home/rails/fandrive/site-packages/django/db/models/base.py" in save_base
  483.                     values = [(f, f.get_db_prep_save(raw and getattr(self, f.attname) or f.pre_save(self, True))) for f in meta.local_fields if not isinstance(f, AutoField)]
File "/home/rails/fandrive/site-packages/django/db/models/fields/files.py" in pre_save
  252.             file.save(file.name, file, save=False)
File "/home/rails/fandrive/site-packages/django/db/models/fields/files.py" in save
  91.         self.name = self.storage.save(name, content)
File "/home/rails/fandrive/site-packages/django/core/files/storage.py" in save
  47.         name = self._save(name, content)
File "/home/rails/fandrive/site-packages/django/core/files/storage.py" in _save
  146.             os.makedirs(directory)
File "/bin/python-2.6.1/lib/python2.6/os.py" in makedirs
  150.             makedirs(head, mode)
File "/bin/python-2.6.1/lib/python2.6/os.py" in makedirs
  150.             makedirs(head, mode)
File "/bin/python-2.6.1/lib/python2.6/os.py" in makedirs
  150.             makedirs(head, mode)
File "/bin/python-2.6.1/lib/python2.6/os.py" in makedirs
  150.             makedirs(head, mode)
File "/bin/python-2.6.1/lib/python2.6/os.py" in makedirs
  150.             makedirs(head, mode)
File "/bin/python-2.6.1/lib/python2.6/os.py" in makedirs
  157.     mkdir(name, mode)

有没有什么建议我可以检查的？

更新：我的模型

class UserProfile(InheritedProfile):
    def upload_path(self, field_attname):
        filename = hashlib.md5(field_attname).hexdigest()[:4] + "_" + field_attname
        return "uploads/users/%s" % (filename,)

    user = models.ForeignKey(User, unique=True, related_name='profile')
    image = models.ImageField(upload_to=upload_path, verbose_name="Image", blank=True, null=True)

我已经创建了'uploads/users'文件夹，为什么它还在尝试创建一个文件夹，而不是直接创建文件呢？

django 目录结构文件上传模型设计表单处理文件权限 os错误

在Django上传文件时出现OSError

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