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'CombinedExpression' object is not iterable when using an admin filter on Django 1.8

See original GitHub issue

Hi,

I’m having a problem when using BitFieldListFilter on Django 1.8

Selecting any item in the filter raises the following error:

Traceback:
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/contrib/admin/options.py" in wrapper
  616.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/utils/decorators.py" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/contrib/admin/sites.py" in inner
  233.             return view(request, *args, **kwargs)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/utils/decorators.py" in _wrapper
  34.             return bound_func(*args, **kwargs)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/utils/decorators.py" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/utils/decorators.py" in bound_func
  30.                 return func.__get__(self, type(self))(*args2, **kwargs2)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/contrib/admin/options.py" in changelist_view
  1548.                 self.list_max_show_all, self.list_editable, self)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/contrib/admin/views/main.py" in __init__
  82.         self.get_results(request)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/contrib/admin/views/main.py" in get_results
  177.         result_count = paginator.count
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/core/paginator.py" in _get_count
  77.                 self._count = len(self.object_list)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/query.py" in __len__
  144.         self._fetch_all()
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/query.py" in _fetch_all
  965.             self._result_cache = list(self.iterator())
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/query.py" in iterator
  238.         results = compiler.execute_sql()
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in execute_sql
  829.             sql, params = self.as_sql()
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in as_sql
  387.             where, w_params = self.compile(self.query.where)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in compile
  357.             sql, params = node.as_sql(self, self.connection)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/sql/where.py" in as_sql
  104.                     sql, params = compiler.compile(child)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in compile
  357.             sql, params = node.as_sql(self, self.connection)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/django/db/models/lookups.py" in as_sql
  210.         lhs_sql, params = self.process_lhs(compiler, connection)
File "/Users/antonin/Documents/Projects/venv/lib/python3.4/site-packages/bitfield/query.py" in process_lhs
  38.             params.extend(self.get_db_prep_lookup(self.rhs, connection)[1])

Exception Type: TypeError at /admin/core/item/
Exception Value: 'CombinedExpression' object is not iterable

It looks like this should be fixed for Django 1.8