#-*- coding: utf-8 -*-
from django.conf import settings
from django.core import exceptions
from django.utils.importlib import import_module
def load_class(class_path, setting_name=None):
"""
Loads a class given a class_path.
The setting_name parameter is only there for pretty error output, and
therefore is optional
"""
try:
class_module, class_name = class_path.rsplit('.', 1)
except ValueError:
if setting_name:
txt = '%s isn\'t a valid module. Check your %s setting' % (class_path,setting_name)
else:
txt = '%s isn\'t a valid module.' % class_path
raise exceptions.ImproperlyConfigured(txt)
try:
mod = import_module(class_module)
except ImportError, e:
if setting_name:
txt = 'Error importing backend %s: "%s". Check your %s setting' % (class_module, e, setting_name)
else:
txt = 'Error importing backend %s: "%s".' % (class_module, e)
raise exceptions.ImproperlyConfigured(txt)
try:
clazz = getattr(mod, class_name)
except AttributeError:
if setting_name:
txt = 'Backend module "%s" does not define a "%s" class. Check your %s setting' % (class_module, class_name, setting_name)
else:
txt = 'Backend module "%s" does not define a "%s" class.' % (class_module, class_name)
raise exceptions.ImproperlyConfigured(txt)
return clazz
def get_model_string(model_name):
"""
Returns the model string notation Django uses for lazily loaded ForeignKeys
(eg 'auth.User') to prevent circular imports.
This is needed to allow our crazy custom model usage.
"""
class_path = getattr(settings, 'SHOP_%s_MODEL' % model_name.upper().replace('_', ''), None)
51 if not class_path:
return 'shop.%s' % model_name
else:
klass = load_class(class_path)
return '%s.%s' % (klass._meta.app_label, klass.__name__)
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