+1000! I think it's an elegant solution to the stated problem, and
would be immensely useful on its own merits regardless. For example,
I'm using Django to write a lot of custom business logic for an
intranet, and I've already run into the dependencies issue; being
able to explicitly state them and have django-admin take them into
account would save me a *lot* of headaches.
Regards,
Jeff
On Dec 20, 2005, at 10:24 PM, Adrian Holovaty wrote:
I've been wanting to make the "core" and "auth" models optional for
installation, effectively removing the "django-admin.py init" command
and requiring people to install "core" and "auth" explicitly.
Reasoning: It's messy for the framework to create database tables that
everybody doesn't necessarily use. For instance, if somebody doesn't
use the admin or need support for users, the auth app is completely
unnecessary. Sames goes for the stuff in the "core" app. I have seen
this criticism come up from a couple of people.
However, we shouldn't make it any harder to get started using Django
-- and having to install "core" and "auth" would require extra steps
that aren't currently necessary. So a solution that Jacob and I came
up with is introducing app dependencies. The admin app, for instance,
is dependent on auth and core. The auth app is dependent on core.
There are many apps in Ellington (the World Online commercial CMS
built on Django) that depend on other ones.
A dependency system would solve two problems:
* Having to know which order to install things in.
* Having to install all the dependencies before you install an app
(e.g. installing auth before admin).
Hence, instead of the tutorial saying "django-admin.py init", it would
say "django-admin.py install admin", which would automatically install
the auth app and anything else that's needed.
So how is this implemented? The simplest way we could do it is a
__dependencies__ variable in the __init__.py of the app. For example,
this would go in django/contrib/admin/__init__.py:
__dependencies__ = ('django.contrib.auth',)
(This assumes auth gets moved to django.contrib.auth rather than being
special-cased in django/models.)
Adrian
--
Adrian Holovaty
holovaty.com | djangoproject.com | chicagocrime.org
--
Jeffrey E. Forcier
Junior Developer, Research and Development
Stroz Friedberg, LLC
15 Maiden Lane, 12th Floor
New York, NY 10038
[main]212-981-6540 [direct]212-981-6546
http://www.strozllc.com
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