Hi to everyone:
Having models like these:
class Area(models.Model):
name = models.CharField(max_lentgh=30)
class Element(models.Model):
name = models.CharField(max_lentgh=30)
class Expenses(models.Model):
area = models.ForeignKey(Area, on_delete=models.CASCADE )
element = models.ForeignKey(Element, on_delete=models.CASCADE )
year = models.SmallIntegerField()
month = models.SmallIntegerField()
cost = model.DecimalField(max_digits=10, decimal_places=2, default=0)
I would like to group by area, then by element, and then get sum by month
and accumulated expenses for that element in the year. how could that be
done using Django ORM?
Something to show like this
Expenses in current
Area Element Month Year
Operations Cell phone 325.65 712.40
Operations Office consumibles 451.00 1028.56
Main office Cell phone 148.89 284.41
Main office Office consumibles 650.00 1300.00
Thanks in advance,
Felix.
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