Issues

AttributeError

SettingNotSet instance has no attribute ‘args’

Check the exception traceback; if you can see CacheNotRespondingError then this error is probably caused by errors reading from the cache. To solve the problem, start the memcached service.

str object has no attribute resolve

urlresolvers.py in resolve, line 218
'str' object has no attribute 'resolve'
# Also (at a later date), the following error message:
AttributeError: 'list' object has no attribute 'handler500'

This blog entry was helpful, Django: AttributeError: ‘str’ object has no attribute ‘resolve’

…but, the problem turned out to be with my ROOT_URLCONF where I had a list:

ROOT_URLCONF = ['django_satchmo_site_shop.urls']

…where it should have been a simple string i.e:

ROOT_URLCONF = 'django_satchmo_site_shop.urls'

Values instance has no attribute ‘default_reference_context’

Problem with restructuredtext in markup module.

After installing docutils (pip install docutils), had the following exception:

Values instance has no attribute 'default_reference_context'

To solve the problem, comment out:

docutils.parsers.rst.roles.DEFAULT_INTERPRETED_ROLE = 'cmsreference'

…in…

django/contrib/admindocs/utils.py

Error

Error: No module named

I was running the following command from within a virtual environment:

# django-admin shell --settings=settings_test
Error: No module named messages

Turns out I was using the django-admin from:

/usr/lib/python2.4/site-packages/django/bin/django-admin.py

…when I should have been using django-admin from the virtual environment. To diagnose this, run the following:

which django-admin
which python
find / -name django-admin.py

To solve the problem, I ran the following (from within my virtual environment):

python /path/to/my/virtual/env/bin/django-admin.py  shell --settings=settings_test

ImproperlyConfigured

When running tests, I had the following error:

django.core.exceptions.ImproperlyConfigured:
App with label item_request could not be found

Turns out my PYTHONPATH setting didn’t include the current folder. To solve the problem, add the current folder to the PYTHONPATH e.g:

PYTHONPATH=.:../my_other_app; export PYTHONPATH

add2virtualenv

Note: If using add2virtualenv make sure to add the current folder before other folders i.e: edit virtualenv_path_extensions.pth and make sure the current folder is first in the list:

add2virtualenv .
cdsitepackages
vim virtualenv_path_extensions.pth

runserver

Error: That port is already in use.

Open up the process viewer (on Ubuntu, System Monitor), and kill the python processes.

ps faux | grep runserver

Slow

django is very slow on my machine

runserver using localhost on Windows can be very slow. To solve this issue, remove the following line from your hosts file:

# ::1             localhost

On Vista, the file can be found here:

C:\Windows\System32\drivers\etc\hosts

Note: I don’t know what this line is for, so it could be bad to remove it. For more information see Windows hosts file

Templates

Kept getting a TemplateDoesNotExist exception, when the exception reported File exists:

TemplateDoesNotExist at /wiki/edit/NewArticle/
wiki/edit-markitup.html

Django tried loading these templates, in this order:

Using loader django.template.loaders.filesystem.load_template_source:
/srv/django/mycompany/templates/wiki/edit-markitup.html (File exists)

… this was a file permissions issue. I changed the permissions as follows and the problem is solved:

chown apache:apache templates/wiki/*
chmod 664 templates/wiki/*

Template Tags

The template tag couldn’t be loaded… I checked the following:

The application was included in INSTALLED_APPS in settings.py.

I could import the class using the shell:

python manage.py shell
> from django.templatetags import el_markdown

To solve the problem, I had to set the correct permissions on the templatetags folder:

chown apache:apache mywiki/templatetags
chmod 775 mywiki/templatetags
chmod g+s mywiki/templatetags