[Django] #26205: migrate and other commands fail with TypeError: 'NoneType' object has no attribute '__getitem__' in schema.py
Django
attribute '__getitem__' in schema.py
----------------------------+----------------------------------------------
Reporter: mrkiwi-nz | Owner: nobody
Type: | Status: new
Uncategorized |
Component: | Version: 1.9
Uncategorized |
Severity: Normal | Keywords: schema.py PRAGMA NonType migrate
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+----------------------------------------------
Only occurs with a sqlite engine where the command "PRAGMA foreign_keys"
returns nothing (instead of returning 0 or 1).
This happens (at least) on sqlite3 v 3.3.6. Doesn't occur on 3.8.11.
The net effect is that the following manage.py comands fail;
migrate
makemigrations
test
plus other commands if they trigger a migration.
Changing line 25 of django/db/backends/sqlite3/schema.py from this;
{{{
self._initial_pragma_fk = c.fetchone()[0]
}}}
to this
{{{
self._initial_pragma_fk = 0 # c.fetchone()[0]
}}}
enables you to proceed with the migration.
--
Ticket URL: <https://code.djangoproject.com/ticket/26205>
Django <https://code.djangoproject.com/>
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Django
attribute '__getitem__' in schema.py
Reporter: mrkiwi-nz | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.9
Severity: Normal | Resolution:
Keywords: schema.py PRAGMA | Triage Stage:
NonType migrate | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Changes (by charettes):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
While we don't document a minimum sqlite3 version I don't think we should
commit to support a version that is almost
[https://www.sqlite.org/changes.html#version_3_3_6 10 years old].
I suggest we document a minimal supported version like we do with other
backends.
--
Ticket URL: <https://code.djangoproject.com/ticket/26205#comment:1>
Django
attribute '__getitem__' in schema.py
Reporter: mrkiwi-nz | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.9
Severity: Normal | Resolution:
Keywords: schema.py PRAGMA | Triage Stage:
NonType migrate | Unreviewed
Has patch: 0 | Needs documentation: 0
Easy pickings: 0 | UI/UX: 0
Comment (by mrkiwi-nz):
Regarding not supporting 3.3.6, that's fair enough, but for anyone
following even the most basic getting-started tutorials, the exception
this throws is way beyond what a beginner should be expected to
troubleshoot. Even knowing that it might be a back-end issue, or finding
your version of sqlite3 is not obvious from the exception.
My server (smeserver 8.2/centos 5.11) had been running django (various
versions) for about 2 years fine until I upgraded to django 1.9.2 and
nuked the db and tried to run migrations from scratch. I didn't even have
sqlite3 installed, but So I had to install sqlite3 to even find the
version number of sqlite3.
How about wrapping line 25 in a try: block to ensure a value is returned
from "PRAGMA foreign_keys", or testing the sqlite version like other
backends do (AFAIK) so that a helpful error message can be thrown (rather
than ...NoneType' object has no attribute...)?
--
Ticket URL: <https://code.djangoproject.com/ticket/26205#comment:2>
Django
attribute '__getitem__' in schema.py
Reporter: mrkiwi-nz | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.9
Severity: Normal | Resolution:
Keywords: schema.py PRAGMA | Triage Stage:
NonType migrate | Unreviewed
Has patch: 0 | Needs documentation: 0
Easy pickings: 0 | UI/UX: 0
Comment (by claudep):
Django uses pysqlite2 if it is installed, but most often it falls back to
the sqlite3 integrated module.
On Python 2.7:
{{{
$ python2
Python 2.7.9 (default, Mar 1 2015, 12:57:24)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlite3
>>> sqlite3.sqlite_version
'3.8.7.1'
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/26205#comment:3>
Django
attribute '__getitem__' in schema.py
Reporter: mrkiwi-nz | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.9
Severity: Normal | Resolution:
Keywords: schema.py PRAGMA | Triage Stage:
NonType migrate | Unreviewed
Has patch: 0 | Needs documentation: 0
Easy pickings: 0 | UI/UX: 0
Comment (by timgraham):
Where do you encounter this old version of SQLite? Django only supports
the latest point release of each major version of Python, so if this is
with an older point release, I don't think additional documentation is
necessary.
--
Ticket URL: <https://code.djangoproject.com/ticket/26205#comment:4>
Django
attribute '__getitem__' in schema.py
Reporter: mrkiwi-nz | Owner: nobody
Type: Uncategorized | Status: closed
Component: Database layer | Version: 1.9
(models, ORM) |
Severity: Normal | Resolution: needsinfo
Keywords: schema.py PRAGMA | Triage Stage:
NonType migrate | Unreviewed
Has patch: 0 | Needs documentation: 0
Easy pickings: 0 | UI/UX: 0
Changes (by timgraham):
* status: new => closed
* component: Uncategorized => Database layer (models, ORM)
* resolution: => needsinfo
--
Ticket URL: <https://code.djangoproject.com/ticket/26205#comment:5>
Django
attribute '__getitem__' in schema.py
Reporter: mrkiwi-nz | Owner: nobody
Type: Uncategorized | Status: closed
Component: Database layer | Version: 1.9
(models, ORM) |
Severity: Normal | Resolution: needsinfo
Keywords: schema.py PRAGMA | Triage Stage:
NonType migrate | Unreviewed
Has patch: 0 | Needs documentation: 0
Easy pickings: 0 | UI/UX: 0
Comment (by mrkiwi-nz):
Replying to [comment:4 timgraham]:
> Where do you encounter this old version of SQLite? Django only supports
the latest point release of each major version of Python, so if this is
with an older point release, I don't think additional documentation is
necessary.
Tim: This occurs on SME 8.1, which is based on CentOS 5.10
[https://wiki.contribs.org/SME_Server:8.1]
These packages are currently available in the standard repo:
{{{
python-sqlite-1.1.7-1.2.1.0
sqlite-3.3.6-7
sqlite-devel-3.3.6-7
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/26205#comment:6>