Question

我有一个Flask应用程序，我希望使用Flask-Babel发送电子邮件，该模板在模板中有可翻译的字符串。

@celery.task
def send_email(user_email=None):
    with app.app_context():
         html = render_template('user/email_template.html')
         subject = lazy_gettext(u'Subject Line')
         send_email(user_email, subject, html)


 @app.route('/index/', methods=['GET', 'POST'])
 @login_required
 def index():
    ...
    send_email.delay(
         user_email=user.email,
    )

email_template.html

<p>{{ _('Email Test') }}</p>

这会导致错误：

 AttributeError: 'NoneType' object has no attribute 'ugettext'

当我在没有Celery的情况下调用send_email函数时，这不会发生。我是否必须以某种方式将应用程序上下文传递给Celery？

N.B。为清晰起见缩写

修改

完整的堆栈跟踪：

[2016-03-28 12:08:30,528: ERROR/MainProcess] Task main.send_unlock_email[98f520d4-fadf-4272-8c14-17d6c16bf182] raised unexpected: AttributeError("'NoneType' object has no attribute 'ugettext'",)
Traceback (most recent call last):
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task
    R = retval = fun(*args, **kwargs)
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/celery/app/trace.py", line 438, in __protected_call__
    return self.run(*args, **kwargs)
  File "<path>flask-projects/<env>/<env>/views/main.py", line 84, in send_unlock_email
    html = render_template('user/successfull_unlock.html')
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/flask/templating.py", line 128, in render_template
    context, ctx.app)
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/flask/templating.py", line 110, in _render
    rv = template.render(context)
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/jinja2/environment.py", line 989, in render
    return self.environment.handle_exception(exc_info, True)
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/jinja2/environment.py", line 754, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "<path>flask-projects/<env>/<env>/templates/user/successfull_unlock.html", line 1, in top-level template code
    <p>{{ _('Email Test') }}</p>
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/jinja2/ext.py", line 132, in _gettext_alias
    return __context.call(__context.resolve('gettext'), *args, **kwargs)
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/jinja2/ext.py", line 138, in gettext
    rv = __context.call(func, __string)
  File "<path>.envs/<env>/local/lib/python2.7/site-packages/flask_babel/__init__.py", line 116, in <lambda>
    lambda x: get_translations().ugettext(x),
AttributeError: 'NoneType' object has no attribute 'ugettext'

在应用程序上下文错误中，render_template中的Flask和Celery转换

0 个答案: