NoneType error — from Canterbury regionals

[philipbelesky]

Mental note to come back to this — I have a database dump. Seems to affect public_tournament_index.html and draw_adjudicators_edit.html pages. Doesn't seem to be due to something in the template (still wont render even with a blank template) or in the views (the public_index view just returns the template). Possibly some problem with one of the wrapper?

Trace from the public index page:

TypeError at /t/cantabregionals/
'NoneType' object is not iterable
Request Method: GET
Request URL:    http://127.0.0.1:8000/t/cantabregionals/
Django Version: 1.9.2
Exception Type: TypeError
Exception Value:    
'NoneType' object is not iterable
Exception Location: /Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/debug_toolbar/panels/templates/panel.py in _request_context_bind_template, line 81
Python Executable:  /Users/philip/Sites/tc_hamish/venv/bin/python3.5
Python Version: 3.5.1
Python Path:    
['/Users/philip/Sites/tc_hamish',
 '/Users/philip/.pyenv/versions/3.5.1/lib/python35.zip',
 '/Users/philip/.pyenv/versions/3.5.1/lib/python3.5',
 '/Users/philip/.pyenv/versions/3.5.1/lib/python3.5/plat-darwin',
 '/Users/philip/.pyenv/versions/3.5.1/lib/python3.5/lib-dynload',
 '/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages']
Server time:    Sat, 12 Mar 2016 15:36:49 +1100
Traceback Switch to copy-and-paste view

/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/django/core/handlers/base.py in get_response
                    response = self.process_exception_by_middleware(e, request) ...
▶ Local vars
/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/django/core/handlers/base.py in get_response
                    response = wrapped_callback(request, *callback_args, **callback_kwargs) ...
▶ Local vars
/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/django/utils/decorators.py in _wrapped_view
                    response = view_func(request, *args, **kwargs) ...
▶ Local vars
/Users/philip/Sites/tc_hamish/utils/views.py in foo
        return view_fn(request, request.tournament, *args, **kwargs) ...
▼ Local vars
Variable    Value
view_fn 
<function public_index at 0x102a8aa60>
args    
()
kwargs  
{}
request 
<WSGIRequest: GET '/t/cantabregionals/'>
tournament_slug 
'cantabregionals'
/Users/philip/Sites/tc_hamish/tournaments/views.py in public_index
    return render(request, 'public_tournament_index.html') ...
▼ Local vars
Variable    Value
request 
<WSGIRequest: GET '/t/cantabregionals/'>
t   
<Tournament: Canterbury 2016>
/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/django/shortcuts.py in render
            template_name, context, request=request, using=using) ...
▶ Local vars
/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/django/template/loader.py in render_to_string
        return template.render(context, request) ...
▶ Local vars
/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/django/template/backends/django.py in render
            return self.template.render(context) ...
▶ Local vars
/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/django/template/base.py in render
                with context.bind_template(self): ...
▶ Local vars
/Users/philip/.pyenv/versions/3.5.1/lib/python3.5/contextlib.py in __enter__
            return next(self.gen) ...
▶ Local vars
/Users/philip/Sites/tc_hamish/venv/lib/python3.5/site-packages/debug_toolbar/panels/templates/panel.py in _request_context_bind_template
            updates.update(context) ...
▶ Local vars

[philipbelesky]

Seems to either be cache or middleware related. I just created a new view for #285 which now triggers the same error (its basically a copy+paste of the novices tab view, yet the novices tab view is fine). Have had a little look, am unclear on what exactly the object is that is expected — everything tournament_view and public_optional_tournament_view seem to need seems to be present.