#25361: Unpickling of QuerySet fails in presence of abstract intermediate model
-------------------------------------+-------------------------------------
Reporter: Torsten Bronger | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Samuel Spencer):
I just got bit by this and I can't say I've come across the best solution,
but I was able to resolve it with this code in
{{{/django/db/models/fields/__init__.py}}}:
{{{
--- __init__.py 2016-09-22 06:07:36.167725186 +0000
+++ __init__.py.old 2016-09-22 06:08:19.175742789 +0000
@@ -66,11 +66,6 @@
return apps.get_model(app_label,
model_name)._meta.get_field(field_name)
-def _load_field_for_abstract(app_label, model_name, field_name):
- from django.utils.module_loading import import_string
- return import_string('%s.models.%s'%(app_label,
model_name))._meta.get_field(field_name)
-
-
# A guide to Field parameters:
#
# * name: The name of the field specified in the model.
@@ -508,11 +503,7 @@
# Deferred model will not be found from the app registry.
This
# could be fixed by reconstructing the deferred model on
unpickle.
raise RuntimeError("Fields of deferred models can't be
reduced")
- if self.model._meta.abstract:
- func = _load_field_for_abstract
- else:
- func = _load_field
- return func, (self.model._meta.app_label,
self.model._meta.object_name,
+ return _load_field, (self.model._meta.app_label,
self.model._meta.object_name,
self.name)
def get_pk_value_on_save(self, instance):
}}}
{{{__init__.py.old}}} is the original from Django 1.8.14. I'm not sure
where to begin with submitting and testing this, but I'd like to help if
someone could give me some pointers.
--
Ticket URL: <https://code.djangoproject.com/ticket/25361#comment:2>
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