[Django] #26743: DeserializationError local variable 'pk' referenced before assignment (which hides real error)

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Jun 10, 2016, 2:43:44 PM6/10/16

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#26743: DeserializationError local variable 'pk' referenced before assignment
(which hides real error)
--------------------------------------+--------------------
Reporter: lakinwecker | Owner: nobody
Type: Bug | Status: new
Component: Core (Serialization) | Version: 1.9
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
--------------------------------------+--------------------
The first error is this:
{{{
Environment:

Request Method: GET
Request URL:
http://localhost:8000/admin/artcollection/artobject/2298/history/734/

Django Version: 1.9.6
Python Version: 2.7.10
Installed Applications:
['saskartsboard.artcollection',
'saskartsboard.options',
'saskartsboard.descriptive_and_visual_dictionary',
'grappelli',
'versatileimagefield',
'select2',
'ckeditor',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'reversion']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback:

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/core/handlers/base.py" in get_response
149. response =
self.process_exception_by_middleware(e, request)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request,
*callback_args, **callback_kwargs)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/utils/decorators.py" in _wrapped_view
149. response = view_func(request, *args, **kwargs)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/views/decorators/cache.py" in _wrapped_view_func
57. response = view_func(request, *args, **kwargs)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/contrib/admin/sites.py" in inner
244. return view(request, *args, **kwargs)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-packages/reversion/admin.py" in
revision_view
228. return self.revisionform_view(request, version,
self.revision_form_template or
self._get_template_list("revision_form.html"), context)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-packages/reversion/admin.py" in
revisionform_view
191. version.revision.revert(delete=True)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-packages/reversion/models.py" in
revert
92. safe_revert(version_set)

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-packages/reversion/models.py" in
safe_revert
31. version.revert()

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-packages/reversion/models.py" in
revert
207. self.object_version.save()

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-packages/reversion/models.py" in
object_version
168. return list(serializers.deserialize(self.format, data,
ignorenonexistent=True))[0]

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/core/serializers/json.py" in Deserializer
85. six.reraise(DeserializationError, DeserializationError(e),
sys.exc_info()[2])

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/core/serializers/json.py" in Deserializer
79. for obj in PythonDeserializer(objects, **options):

File "/media/mausoleum/Work/Development/saskartsboard-
collections/env/local/lib/python2.7/site-
packages/django/core/serializers/python.py" in Deserializer
142. raise base.DeserializationError.WithData(e,
d['model'], d.get('pk'), pk)

Exception Type: DeserializationError at
/admin/artcollection/artobject/2298/history/734/
Exception Value: local variable 'pk' referenced before assignment
}}}

Which is caused by referring to the 'pk' variable on line 142, which is
only set in the first iteration of the for loop on line 139. If you add a
{{{raise}}} before line 142 you can see the real exception which is:

{{{
Environment: