parameterized apps (was: Re: Eric Florenzano's presentation slides)

[Javier Guerra Giraldez]

from Eric Florenzano's slide 41:

  In models.py:

  class Favorite(models.Model):
      item = LazyForeignKey(‘fave’)
      user = ForeignKey(User)
      date = DateTimeField(default=utcnow)


  In settings.py:

  LAZY_FKS = {‘fave’: ‘pages.models.Page’}


I share the dislike for generic relationships; but don't think this
solution is particularly elegant, nor flexible enough.

what about giving parameters to the apps?  something like:

INSTALLED_APPS = (
        'django.contrib.auth',
        'django.contrib.contenttypes',
        'django.contrib.sessions',
        'django.contrib.sites',
        'django.contrib.admin',
        ('debug_toolbar', {
                'INTERCEPT_REDIRECTS': False,
                'INTERNAL_IPS': ('127.0.0.2',),
        }),
        'django_extensions',
        ('favorites', {
                'fave': ‘pages.models.Page',
        }),
        'comercial',
        'specs',
)


and in favorites.models.py:

  class Favorite(models.Model):
      item = LazyForeignKey(args[‘fave’])
      user = ForeignKey(User)
      date = DateTimeField(default=utcnow)


this helps to reduce global settings pollution, simply by binding a
global ('args' in this example) to the respective app's parameter
dictionary.

it could even allow a project to import a single app twice with
different parameters:

INSTALLED_APPS = (
        ...
        ('favoritebooks', {
                'APP_MODULE': 'favorites',
                'fave': ‘pages.models.Book',
        }),
        ('favoritepages', {
                'APP_MODULE': 'favorites',
                'fave': ‘pages.models.Page',
        }),
        'comercial',
        'specs',
)

here, APP_MODULE tells Django where to import the app from, by default
it would be the app name (as now), but specifying it separately allows
the user to give a different name to the app in the project's context.

toughts?

-- 
Javier

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