#19422: Model subclass not in INSTALLED_APPS breaks object deletion
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Reporter: gcc | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.4
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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For example, if there is a Session subclass somewhere in your code, but
not in an INSTALLED_APPS models.py, then the following code will fail:
{{{
s = Session()
from datetime import datetime
s.expire_date = datetime.now()
s.save()
s.delete()
}}}
It fails here, when trying to delete objects:
{{{
Traceback (most recent call last):
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/project/demo/tests.py",
line 14, in test_demo
s.delete()
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/base.py", line 575, in delete
collector.collect([self])
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/deletion.py", line 175, in collect
if not sub_objs:
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/query.py", line 130, in __nonzero__
iter(self).next()
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/query.py", line 118, in _result_iter
self._fill_cache()
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/query.py", line 875, in _fill_cache
self._result_cache.append(self._iter.next())
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/query.py", line 291, in iterator
for row in compiler.results_iter():
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/sql/compiler.py", line 763, in
results_iter
for rows in self.execute_sql(MULTI):
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/models/sql/compiler.py", line 818, in execute_sql
cursor.execute(sql, params)
File
"/home/installuser/Dropbox/projects/ischool/delete_related_test/ve/local/lib/python2.7
/site-packages/django/db/backends/sqlite3/base.py", line 337, in execute
return Database.Cursor.execute(self, query, params)
DatabaseError: no such table: utility_sessionwithextrafield
}}}
It seems that the model was registered just by being loaded, and
associated itself with a parent model (superclass), but its database table
never got created because it wasn't in INSTALLED_APPS.
So these two should be consistent with each other: either we only register
models for INSTALLED_APPS, or we create database tables for all registered
models even if they're not in INSTALLED_APPS.
Test case repro code is at: https://github.com/qris/django-model-subclass-
delete-problem
--
Ticket URL: <https://code.djangoproject.com/ticket/19422>
Django <https://code.djangoproject.com/>
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