How to store the number of services?

Question

Django

How to organize the storage of the number of services.
There are two models:
Services (name, cost)
Orders/services performed (service, cost
)
from the phone, I apologize for the format)
And how to store the quantity?
How to organize the choice of this number?

Answer 1

class Service(Model):
    name = ...
    price = ...

class Order(Model):
    service = ForeignKey(Service, related_name=u'orders')
    user =  ForeignKey(User, related_name=u'orders')
    done = BooleanField(default=False)

...
orders_by_user_and_service = some_service.orders.filter(user=some_user_instance, done=True)
# or
orders_by_user_and_service = some_user.orders.filter(service=some_service_instance, done=True)
# or
orders_by_user_and_service = Orders.objects.filter(user=some_user_instance, service=some_service_instance, done=True)
# or
orders_by_user_and_service = Orders.objects.filter(user_id=some_user_id, service_id=some_service_id, done=True)
...