Op maandag 27 september 2010 09:08:53 schreef MrMuffin:
> Where do you put your business logic in django? In my project I`ve put
> it into the models.py, but that file soon become huge and hard to
> maintain. Of course I can just stuff it into whatever file I like, but
> I`d like to have some standard way of doing this. There seems to be
> something missing in django when it comes to business logic. It`s all
> model, views and templates and that`s all great for small projects,
> but both the models.py and views.py very soon gets huge and how do you
> re-organize your project when that happens? Splitting views and models
> into seperate files is only a partial solution and that requires some
> hackish code in __init__.py to make syncdb etc work. And then there`s
> urls.py.
I'm surprised no one mentioned manager classes yet. This is an example for
models.py:
from django.db import models
from yourapp.managers import SomeObjectManager
class SomeObject(models.Model):
objects = SomeObjectManager()
Now you can do things like: SomeObject.objects.foo() which is defined in your
manager class. This allows a much better separation of logic and models.
> Should there be a better and standardized way to organize huge
> projects in django?
Yes. Making multiple applications. I highly recommend watching this DjangoCon
video by James Bennett: http://www.youtube.com/watch?v=A-S0tqpPga4
It explains how apps can be made reusable. For example a "blog" application is
actually not 1 monolythic application, but 8+ tiny apps. User registration and
account management can also be written as 4+ little apps.
SInce watching that video, my projects are composed by default of 2 apps. A
"projectname" for the core backend stuff, and a "projectname-site" with the
templates, settings, and frontend media. This is imho a nicer base to start
"hooking in" more applications.
More functionality (tagging, rating, accounts, etc.. will all become separate
apps) which will be hooked in the "projectname-site" project. In case you
wonder, http://www.djangopackages.com/ gives you quite a wealth of small
reusable parts that can be hooked in directly.
Greetings,
Diederik
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