Question

我正在尝试运行这个非常简单的烧瓶/芹菜应用程序：

  @celery.task
    def send_async_email(msg):
        with app.app_context():
            mail.send(msg)

    @celery.task(bind=True)

    @app.route('/', methods=['GET', 'POST'])

    def index():
        if request.method == 'GET':
            return render_template('index.html', email=session.get('email', ''))
        email = request.form['email']
        session['email'] = email

        msg = Message('Hello from Flask',
                      recipients=[request.form['email']])
        msg.body = 'This is a test email sent from a background Celery task.'
        print type(msg)
        print dir(msg)
        print 'msg.send'
        print msg.send
        print 'msg'
        print msg

        if request.form['submit'] == 'Send':

            send_async_email.delay(msg)
            flash('Sending email to {0}'.format(email))
        else:

        return redirect(url_for('index'))

但它不起作用，因为这个Message类的实例不是json serializable，似乎不是这样的：

    msg.send
    <bound method Message.send of <flask_mail.Message object at 0x7ffa94cd0290>>
    msg
    Content-Type: text/plain; charset="utf-8"
    MIME-Version: 1.0
    Content-Transfer-Encoding: 7bit
    Subject: Hello from Flask
    From: flask@example.com

    EncodeError: <flask_mail.Message object at 0x7ffa94cd0290> is not JSON serializable

Answer 1

Celery要求通过代理传递的对象可以直接序列化。 flask_mail.Message个对象不是。您应该更改send_async_email(msg)的方法签名以接受简单的JSON兼容对象。也就是说，原始字符串，int，那些字典或类似的东西。然后，您应该在该方法中移动Message的所有逻辑（从实例化到发送）。

例如：

@celery.task
def send_async_email(message_details):
    with app.app_context():
        msg = Message(message_details['subject'],
                      message_details['recipients'])
        msg.body = message_details['body']
        print type(msg)
        print dir(msg)
        print 'msg.send'
        print msg.send
        print 'msg'
        print msg
        mail.send(msg)

Answer 2

我发现只需设置序列化并添加更改默认就像魅力一样。

app.config.update(
accept_content=['json','pickle']
)

然后，

@celery.task(serializer='pickle')
def send_async_email(msg):

Answer 3

您可以尝试将您的刻录邮件版本降级为0.9.0。

您可以使用此命令执行此操作：

pip uninstall Flask-Mail
pip install Flask-Mail==0.9.0

flask_mail消息实例不是JSON可序列化的

3 个答案: