AttributeError: 'module' object has no attribute 'myapp'

I created a vanilla project using 'django-admin.py
startproject
mysite' and then created a vanilla app in mysite using
'manage.py
startapp myapp'. I ensured that 'mysite.myapp' was added to
mysite.settings.INSTALLED_APPS, and also updated some other
settings
in mysite.settings.py. All well and good.

Now, myapp is the package for my application, and so in its
__init__.py, I want to do some setting up. I wanted some
information
from the User model in django.contrib.auth.models, and so I
imported
django.contrib.auth.models - this led to an error, though I
was able
to import django.contrib.auth without any problems.

With the following myapp/__init__.py:

import django.contrib.auth
print django.contrib.auth
#import django.contrib.auth.models

When I ran 'manage.py diffsettings', I got the following
output, as
expected
(please excuse line-wrap if it happens):

vinayzeta-dapper:~/projects/mysite$ ./manage.py
diffsettings
<module 'django.contrib.auth' from
'/usr/lib/python2.4/site-packages/django/contrib/auth/__init
__.pyc'>
DATABASE_ENGINE = 'sqlite3'
DATABASE_NAME = '/home/vinay/projects/mysite.db'
DEBUG = True
INSTALLED_APPS = ['django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions', 'django.contrib.sites',
'mysite.myapp']
LANGUAGE_CODE = 'en-gb'
MIDDLEWARE_CLASSES =
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.middleware.doc.XViewMiddleware')
ROOT_URLCONF = 'mysite.urls'  ###
SECRET_KEY =
'u_wf!1^!3y7iz!)=3cs8-=clsg^#g&2y16cavha2!fca3macrw'
SETTINGS_MODULE = 'mysite.settings'  ###
SITE_ID = 1  ###
TEMPLATE_DEBUG = True
TIME_ZONE = 'Europe/bond'

However, uncommenting the last line in myapp/__init__.py and
running
'manage.py
diffsettings' led to an error:

vinayzeta-dapper:~/projects/mysite$ ./manage.py
diffsettings
<module 'django.contrib.auth' from
'/usr/lib/python2.4/site-packages/django/contrib/auth/__init
__.pyc'>
Traceback (most recent call last):
  File "./manage.py", line 11, in ?
    execute_manager(settings)
  File
"/usr/lib/python2.4/site-packages/django/core/managemen
t.py",
line 1680, in execute_manager
    execute_from_command_line(action_mapping, argv)
  File
"/usr/lib/python2.4/site-packages/django/core/managemen
t.py",
line 1572, in execute_from_command_line
    translation.activate('en-us')
  File
"/usr/lib/python2.4/site-packages/django/utils/translat
ion/
trans_real.py", line 195, in activate
    _active[currentThread()] = translation(language)
  File
"/usr/lib/python2.4/site-packages/django/utils/translat
ion/
trans_real.py", line 184, in translation
    default_translation = _fetch(settings.LANGUAGE_CODE)
  File
"/usr/lib/python2.4/site-packages/django/utils/translat
ion/
trans_real.py", line
167, in _fetch
    app = getattr(__import__(appname[:p], {}, {},
[appname[p+1:]]),
appname[p+1:])
  File
"/home/vinay/projects/mysite/../mysite/myapp/__init__.p
y", line
3, in ?
    import django.contrib.auth.models
  File
"/usr/lib/python2.4/site-packages/django/contrib/auth/
models.py", line 4,
in ?
    from django.contrib.contenttypes.models import
ContentType
  File
"/usr/lib/python2.4/site-packages/django/contrib/conten
ttypes/
models.py",
line 33, in ?
    class ContentType(models.Model):
  File
"/usr/lib/python2.4/site-packages/django/db/models/base
.py",
line 30, in
__new__
    new_class.add_to_class('_meta',
Options(attrs.pop('Meta', None)))
  File
"/usr/lib/python2.4/site-packages/django/db/models/base
.py",
line 169, in
add_to_class
    value.contribute_to_class(cls, name)
  File
"/usr/lib/python2.4/site-packages/django/db/models/opti
ons.py",
line 53,
in contribute_to_class
    setattr(self, 'verbose_name_plural',
meta_attrs.pop('verbose_name_plural',
self.verbose_name + 's'))
  File
"/usr/lib/python2.4/site-packages/django/utils/function
al.py",
line 42,
in __wrapper__
    res = self.__func(*self.__args, **self.__kw)
  File
"/usr/lib/python2.4/site-packages/django/utils/translat
ion/
trans_real.py", line
255, in gettext
    _default = translation(settings.LANGUAGE_CODE)
  File
"/usr/lib/python2.4/site-packages/django/utils/translat
ion/
trans_real.py", line
184, in translation
    default_translation = _fetch(settings.LANGUAGE_CODE)
  File
"/usr/lib/python2.4/site-packages/django/utils/translat
ion/
trans_real.py", line
167, in _fetch
    app = getattr(__import__(appname[:p], {}, {},
[appname[p+1:]]),
appname[p+1:])
AttributeError: 'module' object has no attribute 'myapp'

Now, why should this be? The traceback is mystifying to me -
can
anyone shed any
light? I certainly want, in myapp's setup, to do some things
based on
django.contrib.auth.models.User. (For example, I might want
to set the
email
field to be unique, which it is not by default). It seemed
reasonable
to assume
that all the apps would be initialised in the order that
they appear
in
INSTALLED_APPS, and mysite.myapp (being last in the list)
should be
able to rely
on the preceding apps being initialised already. If this is
not the
case, where
is the best place to do the kind of initialisation I want
to?

Thanks in advance,


Vinay Sajip


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On 3/30/07, Vinay Sajip <vinay_sajipyahoo.co.uk> wrote:
>
> Now, why should this be? The traceback is mystifying to
me - can
> anyone shed any
> light?

The problem is caused by the way that Django loads and
indexes
applications. I haven't tried putting code in __init__.py,
but it
certainly doesn't surprise me that it has caused you
difficulties.

> If this is not the
> case, where
> is the best place to do the kind of initialisation I
want to?

Well... this depends on exactly what sort of initialization
do you
want to do. I'm still a little unclear on what you want to
initialize,
and why this initialization needs to be done on module load,
rather
than model synchronization, model definition or instance
instantiation).

Yours,
Russ Magee %-)

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