Cumulative (running) sum with django orm and postgresql

Question

Is it possible to calculate the cumulative (running) sum using django\'s orm? Consider the following model:

class AModel(models.Model):
    a_number = models         


        

Answer 1

For posterity, I found this to be a good solution for me. I didn't need the result to be a QuerySet, so I could afford to do this, since I was just going to plot the data using D3.js:

import numpy as np
import datettime

today = datetime.datetime.date()

raw_data = MyModel.objects.filter('date'=today).values_list('a_number', flat=True)

cumsum = np.cumsum(raw_data)