View Decorator

I'm trying to move some code from a view to a decorator to use with
many views. This is the view:

views.py:
def list_type(request):

inst_id=request.session.get('inst_id',None)

## move to decorator
if not inst_id:
path = urlquote(request.get_full_path())
tup = reverse('select_inst'), REDIRECT_FIELD_NAME, path
return HttpResponseRedirect('%s?%s=%s' % tup)
##

queryset = RecordType.objects.filter(institution=inst_id)
return object_list(request, queryset, paginate_by = 12)

I've moved the middle bit of code to a decorator I wrote (basically
copying user_passes_test), but when I use it I get the strange error
that my urls.py file contains no patterns.

decorators.py:
def institution_required(fn, redirect_field_name=REDIRECT_FIELD_NAME):

inst_url = reverse('select_inst') ## URL to select institution

def _wrapped_view(request, *args, **kwargs):
if not request.session.get('inst_id',None):
path = urlquote(request.get_full_path())
tup = inst_url, redirect_field_name, path
return HttpResponseRedirect('%s?%s=%s' % tup)
return fn(request, *args, **kwargs)
return _wrapped_view

Would anyone like to school me on the correct way to write a view
decorator? Thanks in advance.

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