Django+tracwiki到html标记“SafeText”对象没有“get”属性

Question

我正在尝试将trac wiki标记格式呈现为html，以便在我的网站上显示。我试着跟踪另一个SO question 'how do i use trac wiki formatting'，但是code snippet在运行时返回一个错误。需要注意的是，这个问题和代码已经有将近4年的历史了。你知道我怎样才能让它工作吗？

在my urls.py中，我只需调用tracwiki（来自snippet）视图。

#url.py

url(r'^$',                       'tracwiki',              name='index'),

视图.py

"""
Usage:

{% load tracwiki %}

{{ object.body|tracwiki }}

# Logic from http://groups.google.com/group/trac-dev/msg/479decac43883dc0
"""

from trac.test import EnvironmentStub, Mock, MockPerm 
from trac.mimeview import Context 
from trac.wiki.formatter import HtmlFormatter 
from trac.web.href import Href

from django.utils.safestring import mark_safe
from django import template
register = template.Library()

env = EnvironmentStub() 
req = Mock(href=Href('/'), abs_href=Href('http://www.example.com/'), 
           authname='anonymous', perm=MockPerm(), args={})
context = Context.from_request(req, 'wiki')

@register.filter
def tracwiki(s):
    return mark_safe(HtmlFormatter(env, context, s).generate())

以下是返回的错误：

[01/Apr/2014 18:40:53] "GET / HTTP/1.1" 500 60948


AttributeError at /

'SafeText' object has no attribute 'get'

Request Method:     GET
Request URL:    http://xxx.xxx.xxx.xxx/
Django Version:     1.5.5
Exception Type:     AttributeError
Exception Value:    

'SafeText' object has no attribute 'get'

Exception Location:     /mysite/local/lib/python2.7/site-packages/django/middleware/clickjacking.py in process_response, line 30
Python Executable:  /Envs/mysite/bin/python
Python Version:     2.7.5