Hi people,
Given this:
class Category(models.Model):
name = models.CharField()
parent = models.ForeignKey('self', blank=True, null=True)
tree_path = models.CharField() # /<root_id>/.../<parent_id>/<id>/
class Item(models.Model):
name = models.CharField()
categories = models.ManyToManyField(Category)
I need a Category queryset, with each category annotated with a count of items
which have categories whose tree_path starts with the tree_path of the current
category, and with categories for which this count is 0 filtered out.
In case that wasn't clear - I need an efficient way to do this:
for category in Category.objects.all():
category.num_items =
Item.objects.filter(categories__tree_path__startswith=category.tree_path).count()
if category.num_items > 0:
yield category
Suggestions?
TIA, Itai
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