Re: Get last instance object per each month and sum per month in Django

You should search how to make a group by activity and a partition by month then take each partition and sum the record up, i don't know how to do it in Django orm but in sql is the most effective way to solve the issue and it's a lot let expensive than taking all the activities and then search in the status Table.

my 2 cents

Agnese

On Tue, 25 Feb 2020 at 21:07, Mario Bisiani <mariobisiani@gmail.com> wrote:

I tryed to search for answer but nothing yet can help me.

I have one class model Activity and a class model Status :

class Status(models.Model):      activity = models.ForeignKey(Activity, on_delete=models.CASCADE, related_name="all_status")      status_date = models.DateField()      actual_progress = models.DecimalField(max_digits=3, decimal_places=2)

I need to get last 'status_date' for each activity for each month and sum up its actual_progress.

Can't find after many research a way out.

Update

I found a way to get latest status per activity helped here Django - get latest object in each relation:

@classmethod      def get_latest_by_activity_ids(cls, activity_id):          found = []          for aid in Activity.objects.all():              found.append(cls.objects.filter(activity_id=aid).latest("status_date"))          return found 

This gave me a list of dates. Now I'm blocked to sum them up per month.

https://stackoverflow.com/questions/60366457/get-last-instance-object-per-each-month-and-sum-per-month-in-django

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