使用正确的上下文发送电子邮件

这段代码是我的芹菜工人脚本:

from app import celery, create_app
app = create_app('default')
app.app_context().push()

当我尝试运行worker时,我会遇到这个错误:

File "/home/vagrant/myproject/venv/app/mymail.py", line 29, in send_email_celery
    msg.html = render_template(template + '.html', **kwargs)
  File "/home/vagrant/myproject/venv/local/lib/python2.7/site-packages/flask/templating.py", line 126, in render_template
    ctx.app.update_template_context(context)
  File "/home/vagrant/myproject/venv/local/lib/python2.7/site-packages/flask/app.py", line 716, in update_template_context
    context.update(func())
TypeError: 'NoneType' object is not iterable

我的问题是,在芹菜中使用工作人员时,如何发送电子邮件任务.

mymail.py

from flask import current_app, render_template
from flask.ext.mail import Message
from . import mail, celery

@celery.task
def send_async_email_celery(msg):
    mail.send(msg)

def send_email_celery(to, subject, template, **kwargs):
    app = current_app._get_current_object()
    msg = Message(subject, sender=app.config['MAIL_SENDER'], recipients=[to])
    msg.html = render_template(template + '.html', **kwargs)
    send_async_email_celery.delay(msg)

__在里面__

...

def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)

    bootstrap.init_app(app)
    mail.init_app(app)
    db.init_app(app)
    login_manager.init_app(app)
    celery.conf.update(app.config)

    redis_store.init_app(app)

    from .users import main as main_blueprint
    app.register_blueprint(main_blueprint)

    return app

显然,蓝图和工人之间存在一些冲突.如果可能,删除蓝图不是一个选项,因为我需要在电子邮件模板中使用自定义过滤器.

最后发现使用此代码进行一些调试后出现问题的原因是什么.

我有一个app_context_processor不会返回任何结果.

@mod.app_context_processor
def last_reputation_changes():
    if current_user:
        #code
        return dict(reputation='xxx')

发送电子邮件时,current_user需要一个else案例来返回一些内容,因为current_userfrom from flask.ext.login import current_user未定义.基本上我只需要这样的东西.

def last_reputation_changes():
    if current_user:
        #code
        return dict(reputation='xxx')
    else:
        return dict(reputation=None)

所以问题与芹菜无关,而是与烧瓶登录集成有关.