The problem is not the lack of information, the real problem is that i don't
know what to search for .
2010/9/9 bruno desthuilliers <bruno.desthuilli...@gmail.com>
>
>
> On 9 sep, 03:46, maroxe <bachir...@gmail.com> wrote:
> > Hi, I am trying to understand an other magic thing about django: it
> > can convert strings to modules. In settings.py, INSTALLED_APPS is
> > declared like that:
> >
> > INSTALLED_APPS = (
> > 'django.contrib.auth',
> > 'django.contrib.contenttypes',
> > 'django.contrib.sessions',
> > )
> > All it contains is strings. But django will convert those strings to
> > modules and import them later.
> >
> > I want to do be able to do the same thing. but i don't know how.
>
> One of the nice features of OSS is that you can read the source code,
> so no need to reinvent the wheel !-)
>
> Here's a snippet from one of our apps that should get you started:
>
> # -*- coding:utf-8 -*-
> from django.core.exceptions import ImproperlyConfigured
> from django.utils.importlib import import_module
>
> __backends = dict()
>
> def get_backend(classpath=None):
> """Loads an OAI Repository backend and return an instance of it.
>
> <classpath> is the python qualified path to the backend class, as
> a string, ie
> 'myapp.mymodule.ClassName'
>
> If not provided, the backend specified as OAI_BACKEND in the main
> settings
> file will be used.
>
> Note : already instanciated backends are served from a local cache
> """
> from oai.repository import settings
> classpath = classpath or settings.BACKEND
>
> try:
> backend = __backends[classpath]
>
> except KeyError:
> try:
> mod_name, cls_name = classpath.rsplit('.', 1)
> mod = import_module(mod_name)
> except ImportError, e:
> raise ImproperlyConfigured(
> 'Error importing OAI repository backend module %s:
> "%s"' % (mod_name, e)
> )
> try:
> cls = getattr(mod, cls_name)
> except AttributeError:
> raise ImproperlyConfigured(
> 'Module "%s" does not define a "%s" class' %
> (mod_name, cls_name)
> )
>
> # instanciate and stores the backend class
> backend = __backends[classpath] = cls()
>
> return backend
>
> #
>
> ------------------------------------------------------------------------------
> __all__ = ("get_backend",)
>
>
> HTH
>
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