django1/django/contrib/admin/__init__.py

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from django.contrib.admin.helpers import ACTION_CHECKBOX_NAME
from django.contrib.admin.options import ModelAdmin, HORIZONTAL, VERTICAL
from django.contrib.admin.options import StackedInline, TabularInline
from django.contrib.admin.sites import AdminSite, site
from django.utils.importlib import import_module
# A flag to tell us if autodiscover is running. autodiscover will set this to
# True while running, and False when it finishes.
LOADING = False
def autodiscover():
"""
Auto-discover INSTALLED_APPS admin.py modules and fail silently when
not present. This forces an import on them to register any admin bits they
may want.
"""
# Bail out if autodiscover didn't finish loading from a previous call so
# that we avoid running autodiscover again when the URLconf is loaded by
# the exception handler to resolve the handler500 view. This prevents an
# admin.py module with errors from re-registering models and raising a
# spurious AlreadyRegistered exception (see #8245).
global LOADING
if LOADING:
return
LOADING = True
import imp
from django.conf import settings
for app in settings.INSTALLED_APPS:
# For each app, we need to look for an admin.py inside that app's
# package. We can't use os.path here -- recall that modules may be
# imported different ways (think zip files) -- so we need to get
# the app's __path__ and look for admin.py on that path.
# Step 1: find out the app's __path__ Import errors here will (and
# should) bubble up, but a missing __path__ (which is legal, but weird)
# fails silently -- apps that do weird things with __path__ might
# need to roll their own admin registration.
mod = import_module(app)
try:
app_path = mod.__path__
except AttributeError:
continue
# Step 2: use imp.find_module to find the app's admin.py. For some
# reason imp.find_module raises ImportError if the app can't be found
# but doesn't actually try to import the module. So skip this app if
# its admin.py doesn't exist
try:
imp.find_module('admin', app_path)
except ImportError:
continue
# Step 3: import the app's admin file. If this has errors we want them
# to bubble up.
import_module("%s.admin" % app)
# autodiscover was successful, reset loading flag.
LOADING = False