#24007: Unable to unpickle models from an external script
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Reporter: claudep | Owner: nobody
Type: Bug | Status: new
Component: Core (Other) | Version: 1.7
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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I'm using Python rq stack to delegate some tasks from my Django app to a
queued system. In some of those tasks, models are pickled and then
unpickled by rq. Unfortunately, with Django 1.7, I'm getting
`AppRegistryNotReady` errors:
{{{
Traceback (most recent call last):
File "/usr/local/bin/rqworker", line 9, in <module>
load_entry_point('rq==0.4.6', 'console_scripts', 'rqworker')()
File "/usr/local/lib/python2.7/dist-packages/rq/scripts/rqworker.py",
line 100, in main
w.work(burst=args.burst)
File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 358, in
work
self.execute_job(job)
File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 422, in
execute_job
self.main_work_horse(job)
File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 457, in
main_work_horse
success = self.perform_job(job)
File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 473, in
perform_job
job.func_name,
File "/usr/local/lib/python2.7/dist-packages/rq/job.py", line 226, in
func_name
self._unpickle_data()
File "/usr/local/lib/python2.7/dist-packages/rq/job.py", line 194, in
_unpickle_data
self._func_name, self._instance, self._args, self._kwargs =
unpickle(self.data)
File "/usr/local/lib/python2.7/dist-packages/rq/job.py", line 48, in
unpickle
obj = loads(pickled_string)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py",
line 1464, in model_unpickle
model = apps.get_model(*model_id)
File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py",
line 199, in get_model
self.check_models_ready()
File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py",
line 131, in check_models_ready
raise AppRegistryNotReady("Models aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: (AppRegistryNotReady("Models
aren't loaded yet.",), <function model_unpickle
}}}
As you can see in the stack trace, my code has no chance to fix this as it
is not called before the unpickling process.
One idea could be to check the app registry state in `model_unpickle` and
populate it if needed. Thoughts?
--
Ticket URL: <https://code.djangoproject.com/ticket/24007>
Django <https://code.djangoproject.com/>
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