Django last thirty days added with number

Question

With a model like this:

class User(models.Model):
    entered = models.DateTimeField(auto_now_add=True)

How to grab stats data so it show recent added users for last 30 days with number of users added on that day.

Example:

2010-08-02: 220
2010-08-08: 1220
2010-08-14: 20

Answer 1

Update:

This answer is not useful. As entered is a DateTimeField the query will end up with a count of 1 for each value of entered. This is not what the OP wanted. (Thanks dannyroa)

Changing the type of entered to DateField should help.

Original Answer

You can use Django's aggregation feature to do this. Something like this:

from django.db.models import Count
q = User.objects.annotate(Count('entered')).order_by('-entered')
for user in q[0:30]:
    print "%s %s" % (user.entered, user.entered__count)

Update

You can slice the queryset and then pass it into the template.

# View 
def my_view(*args, **kwargs):
    queryset = User.objects.annotate(Count('entered')).order_by('-entered')
    context = dict(queryset = queryset[0:30])
    return render_to_response('my_template.html', context_instance = RequestContext(request, context))    

# Template
{% for user in queryset %}
    <td>{{ user.entered }}</td>
    <td>{{ user.entered_count }}</td>
{% endfor %}