#26953 closed Bug (invalid)
Custom manager inheriting BaseManager.from_queryset() crashes with AssertionError
Reported by: | Mikuláš Poul | Owned by: | nobody |
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Component: | Database layer (models, ORM) | Version: | 1.9 |
Severity: | Normal | Keywords: | |
Cc: | Loic Bistuer | Triage Stage: | Unreviewed |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description (last modified by )
The unthinkable happened!
Traceback (most recent call last): File "manage.py", line 14, in <module> execute_from_command_line(sys.argv) File "{...}/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 350, in execute_from_command_line utility.execute() File "{...}/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 324, in execute django.setup() File "{...}/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup apps.populate(settings.INSTALLED_APPS) File "{...}/local/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate app_config.import_models(all_models) File "{...}/local/lib/python2.7/site-packages/django/apps/config.py", line 202, in import_models self.models_module = import_module(models_module_name) File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module __import__(name) File "{...}/budgetter-app/apps/expense/models.py", line 29, in <module> class Expense(models.Model): File "{...}/local/lib/python2.7/site-packages/django/db/models/base.py", line 283, in __new__ new_class._prepare() File "{...}/local/lib/python2.7/site-packages/django/db/models/base.py", line 332, in _prepare ensure_default_manager(cls) File "{...}/local/lib/python2.7/site-packages/django/db/models/manager.py", line 45, in ensure_default_manager "Should never get here. Please report a bug, including your " AssertionError: Should never get here. Please report a bug, including your model and model manager setup.
My model and manager setup
from django.db import models from django.db.models.manager import BaseManager from django.db.models.query import QuerySet class ExpenseQuerySet(QuerySet): pass class ExpenseManager(BaseManager.from_queryset(ExpenseQuerySet)): pass class Expense(models.Model): objects = ExpenseManager()
Change History (5)
comment:1 by , 8 years ago
comment:2 by , 8 years ago
Cc: | added |
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Description: | modified (diff) |
There's no crash in Django 1.10 as of ed0ff913c648b16c4471fc9a9441d1ee48cb5420, however, I'm not certain about the correct resolution of this ticket. For example, should we add an additional test for this case?
I edited the description to leave only the minimal code necessary to reproduce the issue.
comment:3 by , 8 years ago
Does the crash also happen if managers.Manager
is used instead of managers.BaseManager
?
The later is not part of the public API and I would be tempted to close this ticket as invalid if it's usage triggers the crash now that this code path is gone in 1.10+.
comment:4 by , 8 years ago
Resolution: | → invalid |
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Status: | new → closed |
Type: | Uncategorized → Bug |
Using Manager
rather than BaseManager
doesn't crash on 1.9. Thanks Simon.
comment:5 by , 8 years ago
Summary: | Should never get here. Please report a bug, including your model and model manager setup. → Custom manager inheriting BaseManager.from_queryset() crashes with AssertionError |
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Adding
use_for_related_fields = True
to ExpenseManager fixed the issue. But still...