Application dependencies should be documented

[anonymous]

svn At revision 2864.

MIDDLEWARE_CLASSES = (

"django.middleware.common.CommonMiddleware",
"django.contrib.sessions.middleware.SessionMiddleware",
"django.contrib.auth.middleware.AuthenticationMiddleware",
"django.middleware.doc.XViewMiddleware",
'django.contrib.flatpages.middleware.FlatpageFallbackMiddleware',

)

INSTALLED_APPS = (

'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',

# 'django.contrib.sites',

'django.contrib.admin',
'django.contrib.flatpages',
'mydjangoproject.customers',

)

error:
~/mydjangoproject$ python manage.py syncdb
Error: None couldn't be installed, because there were errors in your model:
flatpages.flatpage: 'sites' has m2m relation with uninstalled model Site

if I uncomment django.contrib.sites everything works

[Esaj]

That's because flatpages depends on sites.

[eugene@…]

Application dependencies should be documented.

One more frequently occured dependency chain: django.contrib.admin depends on django.contrib.auth, and django.contrib.contenttypes. Attempts to run an app without them brings following errors (?):

Validating models...
admin.logentry: 'user' has relation with uninstalled model User
admin.logentry: 'content_type' has relation with uninstalled model ContentType
2 errors found.

I don't think this is an error per se, but it should be documented to reduce a confusion. For starters these error messages don't say anything about what additional applications are required.

[Jacob]

(In [5432]) Fixed #1791 - documented dependancies of contrib packages.