django报错: SuspiciousOperation exception on ImageField upload的原因

今天在用django写了个图片上传测试APP的时候，上传图片就报错如下：

[code]
SuspiciousOperation at /admin/photos/photo/1/

Attempted access to '\upload\201110\2011-09-151302830075_m.jpg' denied.
Request Method:   POST
Request URL:   http://127.0.0.1:8000/admin/photos/photo/1/
Django Version:   1.3
Exception Type:   SuspiciousOperation
Exception Value:  

Attempted access to '\upload\201110\2011-09-151302830075_m.jpg' denied.

Exception Location:   c:\python27\lib\site-packages\django\core\files\storage.py in path, line 234
Python Executable:   E:\workspace\Test\Scripts\python.exe
Python Version:   2.7.2
[/code]

找了半天，没发现代码上有问题，然后搜索，也没同样的问题。

最后还是在google groups中找到了。原因是ImageField字段的属性upload_to指定的这个目录前面不能有斜扛。

[code]
upload_to="upload/%Y%m/" #正确的写法
upload_to="/upload/%Y%m/" #这样就会报错
[/code]

参考：[url=http://groups.google.com/group/django-users/msg/ebf7f00915c5ac8a?dmode=source]http://groups.google.com/group/django-users/msg/ebf7f00915c5ac8a?dmode=source[/url]