Tuesday, June 21, 2016

Django 1.7, 1.8 - queryset.extra is deprecated, how to do group by on datetime with date

In Django 1.5/1.6 version -

signup_count = list(User.objects.filter(
                             'date_only': "date(date_joined)"}).values(

It used to return list with
[{ 'date_only': , 'signup_count': }]

Now, as the extra is deprecated in newer version of Django, here the work around to get the same -

from django.db.models.expressions import Func

# Create custom sql function
class ExtractDateFunction(Func):

    function = "DATE"

signup_signup = list(User.objects.filter(

This should give you the same results as before. 

Monday, June 6, 2016

There is no South database module 'south.db.mysql' for your database - Django

Django 1.8+

Recently I come across this error, while running my Django application 
python manage.py runserver

There is no South database module 'south.db.mysql' for your database. Please either choose a supported database, check for SOUTH_DATABASE_ADAPTER[S] settings, or remove South from INSTALLED_APPS.

To fix it, you would try to lookup for south.db.mysql or try to search if you SOUTH_DATABASE_ADAPTERS. But you won't find it in your solution. To fix it you have two choices -

1. Manually downgrade to lower Django version i.e.1.6 or so. 
pip install Django==1.6.10

2. Uninstall South from your environment (virtual environment) and move to built-in migration process. 
pip uninstall south

Good luck!