#29330: Regression in master: cannot pickle queryset with expression
-------------------------------------+-------------------------------------
Reporter: Daniel | Owner: nobody
Miller |
Type: Bug | Status: new
Component: Database | Version: master
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
Removal of `BaseExpression.__getstate__` in
[
https://github.com/django/django/pull/9134#pullrequestreview-112057277 PR
9134] caused querysets with expressions derived from `BaseExpression` to
no longer be pickle-able.
Error:
{{{
Traceback (most recent call last):
File "/home/travis/build/millerdev/django-cte/tests/test_recursive.py",
line 212, in test_pickle_recursive_cte_queryset
pickled_qs = pickle.loads(pickle.dumps(regions))
AttributeError: Can't pickle local object
'BaseExpression.convert_value.<locals>.<lambda>'
}}}
Seen here:
https://travis-ci.org/millerdev/django-cte/jobs/366128465 Steps to reproduce:
- Clone [
https://github.com/dimagi/django-cte django-cte]
- Make a virtualenv any way you prefer.
- `pip install git+
https://github.com/django/django.git@master` (or
however you prefer to install django master).
- `pip install nose `
- `nosetests
tests.test_recursive:TestRecursiveCTE.test_pickle_recursive_cte_queryset`
- Observe pickle error.
--
Ticket URL: <
https://code.djangoproject.com/ticket/29330>
Django <
https://code.djangoproject.com/>
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