Django selecting a count - django

Question

I'm fairly new to Django and I want to get the total clients a user has (my users will be selling something through my website) so I have a table called orders where I keep the user_id of the user who purchased and the product_id being purchased. Each product id is related to a product that has a user (the one I'm doing the query for):
select COUNT(distinct(o.user_id)) as total_clients from `order` o
inner join product p on p.id=o.product_id where p.user_id=32;
User id 32 is logged in and I want to show him how many clients purchased his products.
I want to do this in a get instead of filter as it makes more sense.
Here's what my logic tells me to write:
clients = Order.objects.get(
status = Order.COMPLETED,
product__user = self.user
).annotate(
total_clients = Count( 'user', distinct = True )
)
return clients.total_clients
.and here's what it returns:
Exception Type: MultipleObjectsReturned
Exception Value: get() returned more than one Order -- it returned 2!
I could probably be running a query instead of using the orm but I don't want that. This is a rather simple query that I'm sure Django is handling very easily and I want to keep away from writing strings in my code.
Here's my model setup:
class UserProfile( models.Model ):
user = models.OneToOneField( User, related_name = 'profile' )
....
def get_total_clients( self ):
clients = Order.objects.get(
status = Order.COMPLETED,
product__user = self.user
).annotate(
total_clients = Count( 'user', distinct = True )
)
return clients.total_clients
class Order( models.Model ):
PENDING = 0
COMPLETED = 1
REFUNDED = 2
STATUS_CHOICES = (
(PENDING, "Pending"),
(COMPLETED, "Completed"),
(REFUNDED, "Refunded"),
)
user = models.ForeignKey( User, related_name = "orders" )
product = models.ForeignKey( Product, related_name = "orders" )
amount = models.DecimalField( max_digits = 6, decimal_places = 2, default = 0.00 )
status = models.SmallIntegerField(
choices = STATUS_CHOICES, default = PENDING, db_index = True
)
class Product( models.Model ):
user = models.ForeignKey( User, related_name = "unlocks" )
name = models.CharField( max_length = 255 )

Answer 1

Django queryset have a count method:
clients = Order.objects.filter(
status = Order.COMPLETED,
product__user = self.user
)
return clients.count()

Answer 2

If i got you right, you are intrested in the amount of consumers who ordered a product from a user. Some docs, that may be helpful.
My suggestion is:
result = Product.objects.distinct().filter(
# or any query:
orders__status=Order.COMPLETED,
user=default_user
).aggregate( # see the difference between aggregate() and annotate()
total_users=Count('orders__user', distinct=True)
)
I expect the result to be: {'total_users': NUM_OF_USERS}
In raw SQL it will be something like:
SELECT DISTINCT COUNT(DISTINCT "main_order"."user_id") AS
"total_users" FROM "main_product" INNER JOIN "main_order" ON (
"main_product"."id" = "main_order"."product_id" ) WHERE
("main_order"."status" = STATUS AND "main_product"."user_id" = USER_ID)
Is that what you wanted?