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django.db.utils.DatabaseError: Forced update did not affect any rows.

See original GitHub issue

Please see the stack trace below.

I am not absolutely convinced this is a channels issue, but the stack trace makes it look like a channels issue. My interpretation of this (somewhat confusing) stack trace is that channels/sessions.py line 58 has the call to save() that is causing this error.

Unfortunately, it is somewhat random. In particular, when I start investigating the problem in detail, the problem tends to disappear.

Django version 1.11.5, Channels version 1.1.8.

Some sort of race condition maybe??? I have some rough theories, none of them exactly make any sense yet.

[2017-11-27 14:39:27,803: ERROR/django.channels] Error processing message with consumer myrocc.consumers.Demultiplexer:
Traceback (most recent call last):
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/contrib/sessions/backends/db.py", line 87, in save
    obj.save(force_insert=must_create, force_update=not must_create, using=using)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 807, in save
    force_update=force_update, update_fields=update_fields)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 837, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 906, in _save_table
    raise DatabaseError("Forced update did not affect any rows.")
django.db.utils.DatabaseError: Forced update did not affect any rows.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/sessions.py", line 54, in inner
    return func(*args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/auth.py", line 42, in inner
    return func(message, *args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/generic/websockets.py", line 71, in raw_connect
    self.connect(message, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/generic/websockets.py", line 278, in connect
    consumer(message, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/generic/base.py", line 32, in __init__
    self.dispatch(message, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/generic/base.py", line 70, in dispatch
    return self.get_handler(message, **kwargs)(message, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/sessions.py", line 193, in inner
    return func(message, *args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/auth.py", line 73, in inner
    return func(message, *args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/sessions.py", line 58, in inner
    message.channel_session.save()
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/contrib/sessions/backends/db.py", line 94, in save
    raise UpdateError
django.contrib.sessions.backends.base.UpdateError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/contrib/sessions/backends/db.py", line 87, in save
    obj.save(force_insert=must_create, force_update=not must_create, using=using)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 807, in save
    force_update=force_update, update_fields=update_fields)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 837, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 906, in _save_table
    raise DatabaseError("Forced update did not affect any rows.")
django.db.utils.DatabaseError: Forced update did not affect any rows.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/sessions.py", line 78, in inner
    return func(*args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/auth.py", line 89, in inner
    return func(message, *args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/sessions.py", line 58, in inner
    message.channel_session.save()
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/contrib/sessions/backends/db.py", line 94, in save
    raise UpdateError
django.contrib.sessions.backends.base.UpdateError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/contrib/sessions/backends/db.py", line 87, in save
    obj.save(force_insert=must_create, force_update=not must_create, using=using)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 807, in save
    force_update=force_update, update_fields=update_fields)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 837, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/db/models/base.py", line 906, in _save_table
    raise DatabaseError("Forced update did not affect any rows.")
django.db.utils.DatabaseError: Forced update did not affect any rows.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/worker.py", line 119, in run
    consumer(message, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/generic/base.py", line 32, in __init__
    self.dispatch(message, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/generic/base.py", line 70, in dispatch
    return self.get_handler(message, **kwargs)(message, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/sessions.py", line 220, in inner
    result = func(message, *args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/auth.py", line 73, in inner
    return func(message, *args, **kwargs)
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/channels/sessions.py", line 82, in inner
    session.save()
  File "/Users/brianmay/.pyenv/versions/3.6.2/envs/myrocc/lib/python3.6/site-packages/django/contrib/sessions/backends/db.py", line 94, in save
    raise UpdateError
django.contrib.sessions.backends.base.UpdateError

Issue Analytics

State:
Created 6 years ago
Comments:7 (7 by maintainers)

Top GitHub Comments

1reaction

andrewgodwincommented, Nov 29, 2017

Honestly, it might be better to email django-developers or open an issue here to discuss so it’s more public as well.

0reactions

brianmaycommented, Dec 15, 2017

I am going to close this bug report. I very much suspect the test framework we were using was truncating the database while the test server process was still running and processing WebSocket requests.

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