On Fri, May 2, 2008 at 6:07 AM, Michael Burton <[EMAIL PROTECTED]> wrote:
>
> 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)
The difficulty you're having here is that you're trying to write Java
code in Python. :-)
Unless there's something stateful about the UserService, there's no
reason for it to be in a class at all - create_user, create_friendship
etc can just be methods sitting in a module. If you have a whole lot
of services that are logically similar, you might want to split up
your tree thusly:
/myapp
models.py
views.py
/services
user.py
invitation.py
and then put your method definitions into user.py and invitation.py as
appropriate, import the 'service modules' as required, and invoke the
methods:
from myapp.services.user import create_user
...
def myview(request):
...
create_user(some, arguments, here)
In short - not everything is an object, if a method doesn't have state
there is no reason for it to be bound to an object, so don't try to.
Inhale deeply the Pythonic goodness, and the world will be a much
groovier place :-)
> These services would be instantiated as singletons which would then be
Ah.. the singleton... Java's answer to the fact that not everything is
an object. :-)
If you _really_ need your OO fix, consider this - in Python, modules
are objects anyway, so putting the create_user method in the User.py
module is kinda like creating a singleton User object with a
create_user method.
Yours,
Russ Magee %-)
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