Django ORM, group by day

Inspired by this question try this for MySQL

from django.db.models import Count

Product.objects.extra(select={'day': 'date( date_created )'}).values('day') \
               .annotate(available=Count('date_created'))

In Django 1.4, you could use .dates('date_created', 'day') instead of .values().

Try this code snippet:

Product.objects.annotate(available=Count('available_quantity')) \
  .dates('date_created', 'day')

This should return:

[
    {'date_created': datetime.datetime(2012, 4, 14), 'available': 2}, ...
]

Similar approach from San4ez's answer, but returning dates as 'YYYY-MM-DD' instead of 'datetime.datetime(YYYY, MM, DD)':

Product.objects.extra(select={'day': "TO_CHAR(date_created, 'YYYY-MM-DD')"})
               .values('day') \
               .order_by('day') \
               .annotate(available=Count('date_created'))