Custom columns using Django admin

Question

I have a model Data, associated to a table like this (The model Data is made up of only IntegerField):

subject | year | quarter | s         


        

Answer 1

Something like this should work (untested):

# models.py
class Data(models.Model):
    year = models.DateField()
    sales = models.IntegerField()
    # ...

    def sales_current_year(self):
        return self.model._default_manager.get_queryset().filter(year=2012).annotate(Sum('sales'))

 # admin.py
 class DataAdmin(admin.ModelAdmin):
      list_display = ('sales_current_year',)