tickets query breaks if custom ticket checkbox field is set, then cleared

[beardens@…]

A quick summary is that when trying to execute a tickets query, I get the error: "AssertError: Unable to set Empty component query.num_matches_group." This happens after I clear a previously checked checkbox that is a custom ticket field.

I'll record the scenario first, and the python error trace will be given at the end.

First, I added a custom ticket field, by adding this to my trac.ini:

[ticket-custom] product_backlog = checkbox product_backlog.label = Is Product Backlog? ptoduct_backlog.value = 0

Then I defined on a wiki page the following query:

Product-Backlog Work Items, by Milestone

The query works unless I do the following steps:

1. Add a ticket, setting my custom ticket checkbox to checked
2. Update the ticket by UNCHECKING my custom ticket checkbox

At this point I notice that the ticket change log gets this appended:

11/9/2006 11:02:49 AM changed by xxx ¶

• product_backlog deleted.

I would have expected to see "product_backlog set to 0", but maybe this is irrelevant.

When I try to run my query now, it breaks. (But it had worked earlier after I had just added the ticket with checkbox checked, step 1 of the 2 above.0

Here is the error trace:

Traceback (most recent call last):

File "C:\bin\Python2.4\Lib\site-packages\trac\web\main.py", line 356, in dispatch_request

dispatcher.dispatch(req)

File "C:\bin\Python2.4\Lib\site-packages\trac\web\main.py", line 224, in dispatch

resp = chosen_handler.process_request(req)

File "C:\bin\Python2.4\Lib\site-packages\trac\ticket\query.py", line 443, in process_request

self.display_html(req, query)

File "C:\bin\Python2.4\Lib\site-packages\trac\ticket\query.py", line 608, in display_html

req.hdfquery.num_matches_group = num_matches_group

File "C:\bin\Python2.4\Lib\site-packages\trac\web\clearsilver.py", line 195, in setitem

self.set_value(name, value, True)

File "C:\bin\Python2.4\Lib\site-packages\trac\web\clearsilver.py", line 243, in set_value

add_value(name, value)

File "C:\bin\Python2.4\Lib\site-packages\trac\web\clearsilver.py", line 235, in add_value

add_value('%s.%s' % (prefix, k), value[k])

File "C:\bin\Python2.4\Lib\site-packages\trac\web\clearsilver.py", line 219, in add_value

set_str(prefix, int(value))

File "C:\bin\Python2.4\Lib\site-packages\trac\web\clearsilver.py", line 213, in set_str

self.hdf.setValue(prefix.encode('utf-8'), str(value))

Error: Traceback (innermost last):

File "neo_hdf.c", line 783, in hdf_set_value() File "neo_hdf.c", line 773, in _set_value()

AssertError: Unable to set Empty component query.num_matches_group.

Now if I update the ticket again and RE-CHECK the custom checkbox, I see the following added to the ticket history, and my query works again.

11/9/2006 11:06:01 AM changed by xxx ¶

• product_backlog set to 1.