Dynamic Backends

# ================================
# = Dynamic Backends for Modules =
# ================================
def load_backend(setting_name,default_name=None):
    """
    Dynamically loads a backend module from the specified django settings
    name, or falling back to the default value if the settings is empty
    or unspecified in the settings.
    """
    backend_name = None
    from django.conf import settings as django_settings
    if hasattr(django_settings,setting_name):
        backend_name = getattr(django_settings,setting_name) or default_name
    else:
        backend_name = default_name
    
    if backend_name:
        return __import__(backend_name,'','',[''])
    else:
        raise ImportError, 'No backend module specified for %s in Django settings, and no default available.' % setting_name