Re: Django annotation and Implementation for group by every two hours

[Adam Johnson]

Hi, this is the wrong list for questions about using Django, the right list for that is https://groups.google.com/forum/#!forum/django-users . This list is for discussing the development of Django itself.

On 10 July 2017 at 17:15, kanhaiya yadav <kanhaiya...@gmail.com> wrote:

Enter code here...

Hi,

I have a model 

class XyzModel (models.Model):

   name = models.CharField(max_length=NAME_LENGTH)

   unique_id = models.CharField(max_length=NAME_LENGTH)

   info = models.CharField(max_length=NAME_LENGTH, blank=True)

   violation_time = models.DateTimeField()

I have many rows in the database. So I want to group by the results for every two hours or for every four hours.

I want the result something like

name                       violation_date                               interval                                 counts

abc                           2017-07-01                                  06:00 - 08:00                           20

xyz                           2017-07-01                                   08:00 - 10:00                           30

My query is 

XyzModel.objects

            .extra({"day": "date_trunc('hour',violation_time)"}

            .values("day")

            .order_by("day")

            .annotate(count=Count("id"))

But using this query I can only group the result by one hour interval. I want to group by more than one hour interval.

Thanks

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Adam