AssertionError: Cannot rename non-existent page

[506672917@…]

How to Reproduce

While doing a POST operation on /wiki/WikiStart, Trac issued an internal error.

i was renamed the WikiStart page to ProjectHome and put a redirecting link to the new page. when i browse my trac the index page still show me WikiStart,I have to click the redirecting link to my ProjectHome. So I decide delete the WikiStart page,but it is still there.then i try to rename it again, and then it happens.

Request parameters:

{'__FORM_TOKEN': u'356d7841fc0d87d60a16535f',
 'action': u'rename',
 'new_name': u'ProjectHome',
 'page': u'WikiStart',
 'submit': u'\u91cd\u547d\u540d\u9875\u9762'}

User agent: Mozilla/5.0 (Windows NT 5.1; rv:19.0) Gecko/20100101 Firefox/19.0

System Information

Trac	0.12
Babel	0.9.5
Genshi	0.6
pysqlite	2.6.0
Python	2.7.3 (default, Mar 14 2013, 15:39:00) [GCC 4.1.2 20080704 (Red Hat 4.1.2-54)]
setuptools	0.6
SQLite	3.3.6
jQuery	1.4.2

Enabled Plugins

AutocompleteUsers	0.4.2dev
BreadCrumbsNav	0.2
TicketExtPlugin	0.3.2
Tracchildtickets	2.5.2
TracCustomFieldAdmin	0.2.8
TracDateField	2.0.0dev
TracWysiwyg	0.12.0.4

Python Traceback

Traceback (most recent call last):
  File "build/bdist.linux-i686/egg/trac/web/main.py", line 513, in _dispatch_request
    dispatcher.dispatch(req)
  File "build/bdist.linux-i686/egg/trac/web/main.py", line 235, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-i686/egg/trac/wiki/web_ui.py", line 149, in process_request
    return self._do_rename(req, page)
  File "build/bdist.linux-i686/egg/trac/wiki/web_ui.py", line 304, in _do_rename
    @self.env.with_transaction()
  File "build/bdist.linux-i686/egg/trac/db/api.py", line 77, in transaction_wrapper
    fn(ldb)
  File "build/bdist.linux-i686/egg/trac/wiki/web_ui.py", line 306, in do_rename
    page.rename(new_name)
  File "build/bdist.linux-i686/egg/trac/wiki/model.py", line 165, in rename
    assert self.exists, 'Cannot rename non-existent page'
AssertionError: Cannot rename non-existent page

[anonymous]

perhaps the WikiStart page was cached by my proxy server so i got the WikiStart Page so i can delete or rename an non-existent page. maybe it is a false bug.

[Christian Boos]

Or you had that page still present in another tab or another browser, yes.

The internal error is not so nice, we could at least raise a TracError for this, as this is quite easy to trigger.

Done so in r11795.

[Ryan J Ollos]

[11795] merged to trunk in [12408]