Hi all,
I've just upgraded to 1.1 (congrats everybody!), and want to put the
aggregation/annotation features to use. but it doesn't seem to be a
way to annotate the records with counts of different subsets of
related records.
my problem: i have 'Order' and 'Item' models, and the items can be
on several states or processing:
class Order (models.Model):
order_no = models.Integerfield()
date = models.DateTimeField()
client = models.ForeignKey (Client)
class Item (models.Model):
order = models.ForeignKey (Order)
description = models.CharField (max_length=50)
price = models.DecimalField (max_digits=7, decimal_places=2)
quantity = models.IntegerField()
status = models.SmallIntegerField()
and I want to show a list of all the orders, with columns showing how
many items are on each state:
| order | client | not yet | processing | ready |
--------------------------------------------------------
| 000001 | Jon Doe | 5 | 4 | 0 |
| 000002 | Jane Smith | 2 | 7 | 3 |
--------------------------------------------------------
so far, i only found how to add a column with the total number of items:
Order.objects.annotate(Count('item'))
but i can't count subsets of items. Is there any way to do that in
the DB, or I have to do it in Python?
--
Javier
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