Reference to form cleaned data field throws TypeError: 'exceptions.AttributeError' object is not callable

[Gloria W]

This is the strangest bug I've seen in Django. (1.6.4 on Ubuntu 14.04, Python 2.7.6)
 It is sporadic, but once it starts happening, it is consistent until I restart the process.
To try and debug it, I print the value of self.cleaned_data just before it occurs. The value prints fine.


The code:

    def clean_email(self):
        logger.warn("Debugging Attribute error:%s" % pprint.pformat(self.cleaned_data))
        try:
            FytUser.objects.get(email=self.cleaned_data['email'])
            raise forms.ValidationError('A user with that email address already exists.')
        except FytUser.DoesNotExist:
            return self.cleaned_data['email']


The traceback in the uwsgi logs:

Debugging Attribute error:{'email': u'te...@test.net'}

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 114, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)

  File "./registration/views.py", line 54, in preregister_check
    if form.is_valid():

  File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 129, in is_valid
    return self.is_bound and not bool(self.errors)

  File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 121, in errors
    self.full_clean()

  File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 273, in full_clean
    self._clean_fields()

  File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 291, in _clean_fields
    value = getattr(self, 'clean_%s' % name)()

  File "./fyt/forms.py", line 87, in clean_email
    FytUser.objects.get(email=self.cleaned_data['email'])

  File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py", line 151, in get
    return self.get_queryset().get(*args, **kwargs)

  File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 307, in get
    self.model._meta.object_name)

TypeError: 'exceptions.AttributeError' object is not callable


<WSGIRequest
path:/prereg_check/,
GET:<QueryDict: {}>,
POST:<QueryDict: {u'birthday_year': [u'1900'], u'password2': [u'xxxxx'], u'last_name': [u'W'], u'is_member': [u'1'], u'gender': [u'2'], u'first_name': [u'G'], u'birthday_day': [u'01'], u'birthday_month': [u'01'], u'csrfmiddlewaretoken': [u'MYKnPppKtnKV4ybQ86rkYsv8Er2LIc1a'], u'password': [u'xxxxx'], u'email': [u'te...@test.net'], u'discount_code': [u'']}>,
COOKIES:{'_ga': 'xxxxxxx',
 'csrftoken': 'xxxxxxxxx',
 'sessionid': 'xxxxxx',
 'signup_modal': 'true'},
META:{'CONTENT_LENGTH': '221',
 'CONTENT_TYPE': 'application/x-www-form-urlencoded; charset=UTF-8',
 u'CSRF_COOKIE': u'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
 'DOCUMENT_ROOT': '/home/xxxxxx',
 'HTTP_ACCEPT': 'application/json, text/javascript, */*; q=0.01',
 'HTTP_ACCEPT_ENCODING': 'gzip, deflate',
 'HTTP_ACCEPT_LANGUAGE': 'en-US,en;q=0.5',
 'HTTP_CACHE_CONTROL': 'no-cache',
 'HTTP_CONNECTION': 'keep-alive',
 'HTTP_CONTENT_LENGTH': '221',
 'HTTP_CONTENT_TYPE': 'application/x-www-form-urlencoded; charset=UTF-8',
 'HTTP_COOKIE': 'csrftoken=xxxxxxxxxxx; sessionid=xx; _ga=xxxxxx; signup_modal=true',
 'HTTP_HOST': 'findyourtrainer.com',
 'HTTP_PRAGMA': 'no-cache',
 'HTTP_REFERER': 'https://xxxxx/register?next=/',
 'HTTP_USER_AGENT': 'Mozilla/5.0 (X11; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0',
 'HTTP_X_REQUESTED_WITH': 'XMLHttpRequest',
 'PATH_INFO': u'/prereg_check/',
 'QUERY_STRING': '',
 'REMOTE_ADDR': 'xxxxxxxxxxxxxxxx',
 'REMOTE_PORT': '37998',
 'REQUEST_METHOD': 'POST',
 'REQUEST_URI': '/prereg_check/',
 u'SCRIPT_NAME': u'',
 'SERVER_NAME': 'xxxx.com',
 'SERVER_PORT': '443',
 'SERVER_PROTOCOL': 'HTTP/1.1',
 'UWSGI_SCHEME': 'https',
 'uwsgi.node': 'xxxxxxxxxxxx.com',
 'uwsgi.version': '2.0.4',
 'wsgi.errors': <open file 'wsgi_errors', mode 'w' at 0x7f720e9dc150>,
 'wsgi.file_wrapper': <built-in function uwsgi_sendfile>,
 'wsgi.input': <uwsgi._Input object at 0x7f72072c3a50>,
 'wsgi.multiprocess': True,
 'wsgi.multithread': False,
 'wsgi.run_once': False,
 'wsgi.url_scheme': 'https',
 'wsgi.version': (1, 0)}>

This looks like a memory leak to me. Has anyone else seen this?
Thanks in advance,
~G~

[Andromeda Yelton]

clean_email needs to return the cleaned email regardless of whatever else it does.  This clean_email returns email when it's valid but not when it isn't.  This means that whatever Django internals are expecting, and trying to operate upon, its return value are throwing exceptions instead.  This is also why the behavior is intermittent - you only see it with invalid emails. --ay

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Andromeda Yelton

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@ThatAndromeda