1 from django.contrib.admin.helpers import ACTION_CHECKBOX_NAME

     2 from django.contrib.admin.options import ModelAdmin, HORIZONTAL, VERTICAL

     3 from django.contrib.admin.options import StackedInline, TabularInline

     4 from django.contrib.admin.sites import AdminSite, site

     5 from django.utils.importlib import import_module

     6 

     7 # A flag to tell us if autodiscover is running.  autodiscover will set this to

     8 # True while running, and False when it finishes.

     9 LOADING = False

    10 

    11 def autodiscover():

    12     """

    13     Auto-discover INSTALLED_APPS admin.py modules and fail silently when

    14     not present. This forces an import on them to register any admin bits they

    15     may want.

    16     """

    17     # Bail out if autodiscover didn't finish loading from a previous call so

    18     # that we avoid running autodiscover again when the URLconf is loaded by

    19     # the exception handler to resolve the handler500 view.  This prevents an

    20     # admin.py module with errors from re-registering models and raising a

    21     # spurious AlreadyRegistered exception (see #8245).

    22     global LOADING

    23     if LOADING:

    24         return

    25     LOADING = True

    26 

    27     import imp

    28     from django.conf import settings

    29 

    30     for app in settings.INSTALLED_APPS:

    31         # For each app, we need to look for an admin.py inside that app's

    32         # package. We can't use os.path here -- recall that modules may be

    33         # imported different ways (think zip files) -- so we need to get

    34         # the app's __path__ and look for admin.py on that path.

    35 

    36         # Step 1: find out the app's __path__ Import errors here will (and

    37         # should) bubble up, but a missing __path__ (which is legal, but weird)

    38         # fails silently -- apps that do weird things with __path__ might

    39         # need to roll their own admin registration.

    40         try:

    41             app_path = import_module(app).__path__

    42         except AttributeError:

    43             continue

    44 

    45         # Step 2: use imp.find_module to find the app's admin.py. For some

    46         # reason imp.find_module raises ImportError if the app can't be found

    47         # but doesn't actually try to import the module. So skip this app if

    48         # its admin.py doesn't exist

    49         try:

    50             imp.find_module('admin', app_path)

    51         except ImportError:

    52             continue

    53 

    54         # Step 3: import the app's admin file. If this has errors we want them

    55         # to bubble up.

    56         import_module("%s.admin" % app)

    57     # autodiscover was successful, reset loading flag.

    58     LOADING = False