Django 1.9自定义日志处理程序类：“无法配置处理程序'mail_admins'：尚未加载应用程序。”

Question

我正在将现有的Django应用程序从1.8升级到1.9（具体为1.9.4）。我使用自定义日志记录处理程序通过第三方电子邮件提供商（SendGrid）发送管理员错误电子邮件。

执行runserver命令时，会生成以下回溯：

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/coredev/.virtualenvs/django19/lib/python3.4/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "/Users/coredev/.virtualenvs/django19/lib/python3.4/site-packages/django/core/management/__init__.py", line 327, in execute
    django.setup()
  File "/Users/coredev/.virtualenvs/django19/lib/python3.4/site-packages/django/__init__.py", line 17, in setup
    configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
  File "/Users/coredev/.virtualenvs/django19/lib/python3.4/site-packages/django/utils/log.py", line 71, in configure_logging
    logging_config_func(logging_settings)
  File "/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/logging/config.py", line 789, in dictConfig
    dictConfigClass(config).configure()
  File "/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/logging/config.py", line 565, in configure
    '%r: %s' % (name, e))
ValueError: Unable to configure handler 'mail_admins': Apps aren't loaded yet.

以下是自定义日志记录类的相关代码段：

settings.LOGGING中的自定义处理程序：

'mail_admins': {
    'level': 'ERROR',
    'class': 'coredev.utils.logging.SendgridAdminEmailHandler',
    'filters': ['require_debug_false'],
    'include_html': True,
}

coredev / utils的/ logging.py

from django.utils.log import AdminEmailHandler
from coredev.tasks import sendgrid_email
from settings import ADMINS

class SendgridAdminEmailHandler(AdminEmailHandler):

    def send_mail(self, subject, message, *args, **kwargs):

        for admin in ADMINS:
            try:
                if kwargs.get('html_message') is not None:
                    message_content = kwargs['html_message']
                else:
                    message_content = message

                sendgrid_email(admin[1], subject, message_content, message)
            except:
                pass

coredev / tasks.py（相关摘录）

import sendgrid
from django.conf import settings

def sendgrid_email(to, subject, body, alt_body, from_email = settings.DEFAULT_FROM_EMAIL, template_id = settings.DEFAULT_TEMPLATE_ID):

    sg = sendgrid.SendGridClient(settings.EMAIL_HOST_USER, settings.EMAIL_HOST_PASSWORD, raise_errors = True)
    message = sendgrid.Mail()

    message.add_filter('templates', 'enable', '1')
    message.add_filter('templates', 'template_id', template_id)

    message.add_to(to)
    message.set_from(from_email)
    message.set_subject(subject)
    message.set_html(body)
    if alt_body:
        message.set_text(alt_body)

    sg.send(message)

我查看了Django文档（https://docs.djangoproject.com/en/1.9/topics/logging/），以及StackOverflow和Google，但我一直无法找到解决方案。我知道在所有应用程序“准备就绪”之前不会导入模型，但我不相信我在此代码中导入任何模型，所以我不确定为什么会出现此错误。

我的代码的哪一部分导致了这个问题？我需要采取哪些步骤才能使自定义日志记录处理程序与Django 1.9的AppRegistry兼容;特别是，所以我不再得到“应用程序尚未加载”错误？

Answer 1

我有类似的问题。我可以通过在导入其他任何内容之前导入设置来解决它。另外，请听@ Alasdair的建议。

from django.conf import settings
from django.utils.log import AdminEmailHandler
from coredev.tasks import sendgrid_email

class SendgridAdminEmailHandler(AdminEmailHandler):
    def send_mail(self, subject, message, *args, **kwargs):
        for admin in settings.ADMINS:
            try:
                if kwargs.get('html_message') is not None:
                    message_content = kwargs['html_message']
                else:
                    message_content = message
                sendgrid_email(admin[1], subject, message_content, message)
            except:
                pass