我正在努力（非常努力）将我的Django应用程序部署到apache2 / mod_wsgi，但是我遇到的错误只发生在生产环境中。我非常感谢有关下一步该怎么做的任何建议。错误是：
'NoneType' object has no attribute 'objects'
堆栈跟踪指向此功能：
by_site / var /webapps/MYAPP/releases/current/apps/product/models.py"""
Base model used for products. Stores hierarchical categories
as well as individual product level information which includes
options.
"""
from decimal import Context, Decimal, ROUND_FLOOR
from django import forms
from django.conf import settings
from django.contrib.sites.models import Site
from django.core import urlresolvers
from django.core.cache import cache
from django.db import models
from django.db.models import Q
from django.utils.translation import get_language, ugettext, ugettext_lazy as _
from l10n.utils import moneyfmt, lookup_translation
from livesettings import config_value, SettingNotSet, config_value_safe
from prices import get_product_quantity_price, get_product_quantity_adjustments
from product import active_product_types
from product.prices import PriceAdjustmentCalc
from satchmo_utils import get_flat_list
from satchmo_utils.fields import CurrencyField
from satchmo_utils.thumbnail.field import ImageWithThumbnailField
from satchmo_utils.unique_id import slugify
import config #This import is required to make sure livesettings picks up the config values
import datetime
import keyedcache
import logging
import operator
import signals
log = logging.getLogger('product.models')
dimension_units = (('cm','cm'), ('in','in'))
weight_units = (('kg','kg'), ('lb','lb'))
DISCOUNT_SHIPPING_CHOICES = (
('NONE', _('None')),
('FREE', _('Free Shipping')),
('FREECHEAP', _('Cheapest shipping option is free')),
('APPLY', _('Apply the discount above to shipping'))
)
SHIP_CLASS_CHOICES = (
('DEFAULT', _('Default')),
('YES', _('Shippable')),
('NO', _('Not Shippable'))
)
STANDARD_COMPARISON_MEASURES = (
#Weight
('g', '100'),
('kg', '1'),
('mg', '100'),
#Volume
('L', '1'),
('ml', '100'),
#Length
('mm', '100'),
('cm', '100'),
('m', '1'),
('inches', '100'),
#Electricity
('W', '1'),
('V', '1'),
#Each / Pack
('other', '1'),
)
def default_dimension_unit():
val = config_value_safe('PRODUCT','MEASUREMENT_SYSTEM', (None, None))[0]
if val == 'metric':
return 'cm'
else:
return 'in'
def default_weight_unit():
val = config_value_safe('PRODUCT','MEASUREMENT_SYSTEM', (None, None))[0]
if val == 'metric':
return 'kg'
else:
return 'lb'
class CategoryManager(models.Manager):
def active(self):
return self.filter(is_active=True)
def by_site(self, site=None, **kwargs):
"""Get all categories for this site"""
if not site:
site = Site.objects.get_current() <<<<<<<< Line causing error... apparently
site = site.id
return self.active().filter(site__id__exact = site, **kwargs)
def get_by_site(self, site=None, **kwargs):
if not site:
site = Site.objects.get_current()
return self.active().get(site = site, **kwargs)
def root_categories(self, site=None, **kwargs):
"""Get all root categories."""
if not site:
site = Site.objects.get_current()
return self.active().filter(parent__isnull=True, site=site, **kwargs)
def search_by_site(self, keyword, site=None, include_children=False):
"""Search for categories by keyword.
Note, this does not return a queryset."""
if not site:
site = Site.objects.get_current()
cats = self.active().filter(
Q(name__icontains=keyword) |
Q(meta__icontains=keyword) |
Q(description__icontains=keyword),
site=site)
if include_children:
# get all the children of the categories found
cats = [cat.get_active_children(include_self=True) for cat in cats]
# sort properly
if cats:
fastsort = [(c.ordering, c.name, c) for c in get_flat_list(cats)]
fastsort.sort()
# extract the cat list
cats = zip(*fastsort)[2]
return cats
这是抛在satchimo模块中的'产品'。它已在MYAPP / apps中复制和自定义。它在settings.py中安装为'apps.product'。
我的modwsgi文件位于MYAPP / deploy /：
import os
import sys
# redirect sys.stdout to sys.stderr for bad libraries like geopy that uses
# print statements for optional import exceptions.
sys.stdout = sys.stderr
from os.path import abspath, dirname, join
from site import addsitedir
sys.path.insert(0, '/var/webapps/MYAPP/releases/current/apps')
sys.path.insert(0, '/var/webapps/MYAPP/releases/current')
sys.path.insert(0, abspath(join(dirname(__file__), "..", "..")))
from django.conf import settings
os.environ["DJANGO_SETTINGS_MODULE"] = "current.settings"
sys.path.insert(0, join(settings.PINAX_ROOT, "apps"))
sys.path.insert(0, join(settings.PROJECT_ROOT, "apps"))
from django.core.handlers.wsgi import WSGIHandler
application = WSGIHandler()
其他信息
Django版本：1.3.1 Python版本：2.7.1 Python路径：
['/var/webapps/MYAPP/releases/current/apps',
'/var/webapps/MYAPP/releases/current/env/lib/python2.7/site-packages/pinax/apps',
'/var/webapps/MYAPP/releases',
'/var/webapps/MYAPP/releases/current',
'/var/webapps/MYAPP/releases/current/apps',
'/var/webapps/MYAPP/releases/current/env/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg',
'/var/webapps/MYAPP/releases/current/env/lib/python2.7/site-packages/pip-1.0.2-py2.7.egg',
'/var/webapps/MYAPP/releases/current/env/lib/python2.7/site-packages',
'/var/webapps/MYAPPreleases/current/env/lib/python2.7/site-packages/PIL',
'/usr/local/lib/python2.7/dist-packages/virtualenv-1.6.4-py2.7.egg',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-linux2',
'/usr/lib/python2.7/lib-tk',
'/usr/lib/python2.7/lib-old',
'/usr/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages/gtk-2.0',
'/usr/lib/pymodules/python2.7']