>>> Page.objects.get_missing()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/ossi/src/inyoka/inyoka/wiki/models.py", line 314, in get_missing
    missing = list(missing)
  File "/home/ossi/src/inyoka/.venv/lib/python2.7/site-packages/django/db/models/query.py", line 141, in __iter__
    self._fetch_all()
  File "/home/ossi/src/inyoka/.venv/lib/python2.7/site-packages/django/db/models/query.py", line 966, in _fetch_all
    self._result_cache = list(self.iterator())
  File "/home/ossi/src/inyoka/.venv/lib/python2.7/site-packages/django/db/models/query.py", line 1202, in iterator
    for row in self.query.get_compiler(self.db).results_iter():
  File "/home/ossi/src/inyoka/.venv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 701, in results_iter
    for rows in self.execute_sql(MULTI):
  File "/home/ossi/src/inyoka/.venv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 776, in execute_sql
    sql, params = self.as_sql()
  File "/home/ossi/src/inyoka/.venv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 108, in as_sql
    from_, f_params = self.get_from_clause()
  File "/home/ossi/src/inyoka/.venv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 530, in get_from_clause
    extra_cond = join_field.get_extra_restriction(
AttributeError: 'str' object has no attribute 'get_extra_restriction'