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** Branch linked: lp:~raoul-snyman/openlp/bug-825809

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https://bugs.launchpad.net/bugs/825809

Title:
  Extracting Song Usage report crashes

Status in OpenLP - Worship Presentation Software:
  Fix Committed

Bug description:
  Hello,

  trunk r1708, archlinux

  1) Go to "Tools -> Song Usage Tracking -> Extract Tracking Data"
  2) Choose a directory to save the report
  3) Try to extract the report.

  It works, when I uncomment the order_by_ref argument. In the
  songusagedetailform

   --- Exception Traceback ---
  Traceback (most recent call last):
    File "/home/andreas/Projekte/openlp/trunk/openlp/plugins/songusage/forms/songusagedetailform.py", line 114, in accept
      [SongUsageItem.usagedate, SongUsageItem.usagetime])
    File "/home/andreas/Projekte/openlp/trunk/openlp/core/lib/db.py", line 227, in get_all_objects
      return query.order_by(order_by_ref).all()
    File "<string>", line 1, in <lambda>
    File "/usr/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 50, in generate
      fn(self, *args[1:], **kw)
    File "/usr/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 1054, in order_by
      criterion = self._adapt_col_list(criterion)
    File "/usr/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 205, in _adapt_col_list
      for o in cols
    File "/usr/lib/python2.7/site-packages/sqlalchemy/sql/expression.py", line 1279, in _literal_as_text
      "SQL expression object or string expected."
  ArgumentError: SQL expression object or string expected.

  --- Library Versions ---
  Python: 2.7.2
  Qt4: 4.7.3
  Phonon: 4.5.55
  PyQt4: 4.8.5
  SQLAlchemy: 0.7.1
  BeautifulSoup: 3.2.0
  lxml: 2.3.0
  Chardet: 2.0.1
  PyEnchant: 1.6.3
  PySQLite: -

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