I'm coming to Django from the Java Spring MVC world, and over in those
remote lands we have something called a "Service" layer.
The service layer is responsible for doing all the business logic that
your views might otherwise do. For example, you might have something
like:
class UserService:
def create_user(self,...)
def create_friendship(self,user_a, user_b)
or maybe:
class InvitationService:
def send_email_invitation(self,...)
def redeem_invitation(self,invitation)
These services would be instantiated as singletons which would then be
used by higher-up layers like the views. They would typically be re-
used between different views (eg. iPhone, desktop, and REST views
might all use the same service).
Looking at Django, I don't see an obvious place to put these sorts of
common business-logic methods. They don't really belong in the views
since you don't want to have to reimplement them every time you add a
new platform. But they also don't belong in the models, since you
might not want to tie your models to presentation-specifics such as
which email template to use.[1]
I'd like to do things the "Django way", so I thought I'd put the
question out to the community. Where would be the best places to put
business logic like this?
Cheers,
Mike
[1] In addition, there might not be an obvious model for a particular
kind of service. For example, what model would you use for a
FacebookService, if you need to integrate with the facebook platform?
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