Ticket won't display - others do.

[anonymous]

I was browsing the open tickets for 0.8. When I tried Ticket #800 the following error is given:

'function' object has no attribute 'cursor'

Python traceback
 Traceback (most recent call last):
  File "/usr/lib/python2.2/site-packages/trac/ModPythonHandler.py", line 191, in handler
    core.dispatch_request(mpr.path_info, args, mpr, env)
  File "/usr/lib/python2.2/site-packages/trac/core.py", line 433, in dispatch_request
    module.run()
  File "/usr/lib/python2.2/site-packages/trac/Module.py", line 45, in run
    self.render()
  File "/usr/lib/python2.2/site-packages/trac/Ticket.py", line 447, in render
    self.insert_ticket_data(self.req.hdf, id, ticket, reporter_id)
  File "/usr/lib/python2.2/site-packages/trac/Ticket.py", line 412, in insert_ticket_data
    'ticket.attachments')
  File "/usr/lib/python2.2/site-packages/trac/Environment.py", line 231, in get_attachments_hdf
    hdf.setValue(p + '.descr', wiki_to_oneliner(file['description'], hdf, self,self.get_db_cnx))
  File "/usr/lib/python2.2/site-packages/trac/WikiFormatter.py", line 565, in wiki_to_oneliner
    OneLinerFormatter(hdf, env, db, absurls).format(wikitext, out)
  File "/usr/lib/python2.2/site-packages/trac/WikiFormatter.py", line 231, in format
    result = re.sub(rules, self.replace, util.escape(text.strip()))
  File "/usr/lib/python2.2/sre.py", line 143, in sub
    return _compile(pattern, 0).sub(repl, string, count)
  File "/usr/lib/python2.2/site-packages/trac/WikiFormatter.py", line 68, in replace
    return getattr(self, '_' + itype + '_formatter')(match, fullmatch)
  File "/usr/lib/python2.2/site-packages/trac/WikiFormatter.py", line 116, in _tickethref_formatter
    cursor = self.db.cursor ()
AttributeError: 'function' object has no attribute 'cursor'

[vittorio]

this is a duplicate of #807