How to Reproduce

• As logged-in user
• Search for tickets by tag 'privacy' ("https://issues.mediagoblin.org/query?status=!closed&keywords=~privacy")
• Set: Status [] accepted [] closed [x] in_progress [x] new [x] review
• Click 'Update'

Expected Outcome

• See tickets that are tagged with 'privacy'

Actual Outcome

Error (see below)::

While doing a GET operation on /query, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'keywords': [u'~privacy', u'~privacy'],
 'order': [u'priority?status=in_progress', u'priority'],
 'status': [u'in_progress', u'new', u'review', u'new', u'review']}

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:29.0) Gecko/20100101 Firefox/29.0

System Information

System information not available

Enabled Plugins

Plugin information not available

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/trac/web/main.py", line 497, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.7/dist-packages/trac/web/main.py", line 214, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.7/dist-packages/trac/ticket/query.py", line 942, in process_request
    max)
  File "/usr/lib/python2.7/dist-packages/trac/ticket/query.py", line 77, in __init__
    self.order = synonyms.get(order, order)     # 0.11 compatibility
TypeError: unhashable type: 'list'

When using Python 2.6, the ./bin/gmg dbupdate command throws an ImportError[1].

The source of error is in the mediagoblin/processing/__init__.py file, which imports 'OrderedDict' from 'collections'[2].

Fortunately, we've ordereddict[3]. When I imported 'OrderedDict' from this module. Bingo, it worked[4].

A possible fix for this bug would be to first test whether importing OrderedDict from 'collections' doesn't throw an ImportError, if it does (meaning the user has Python 2.6), import OrderedDict from 'ordereddict'.

[1]: ​http://pastebin.com/c06J5H7j [2]: In Python 2.6, there is no OrderedDict in 'collections'. [3]: ​https://pypi.python.org/pypi/ordereddict [4]: here is the diff ​http://pastebin.com/VYtQFW3a

So I can delete media files when running with python3 :-)