我正在使用《Django 2 by Example》一书中的代码示例来构建我的电子商务商店。视图正常工作，但任务从未执行。没有错误。页面在“等待本地主机..."时冻结。我在代码中做错了什么？

views.py

import ...
   from .tasks import order_created

        def order_create(request):
            cart = Cart(request)
            if request.method == 'POST':
                form = OrderCreateForm(request.POST)

                if form.is_valid():
                    order = form.save(commit=False)
                    if cart.promo_code:
                        order.promo_code = cart.promo_code
                        order.discount = cart.promo_code.discount
                    order.save()

                    for item in cart:
                        OrderItem.objects.create(order=order,
                                                 book=item['book'],
                                                 price=item['price'],
                                                 quantity=item['quantity'])
                    # clear the cart
                    cart.clear()
                    print("clean cart")
                    # set the order in the session
                    request.session['order_id'] = order.id
                    print("id  - check")
                    # launch asynchronous task
                    order_created.delay(order.id) # here I stuck
                    print("clean cart")
                    # redirect for payment
                    return redirect(reverse('payment:process'))
            else:
                form = OrderCreateForm()
            return render(request,
                          'orders/order/create.html',
                          {'cart': cart, 'form': form})

字符串

tasks.py

from celery import task
from django.core.mail import send_mail
from .models import Order

@task
def order_created(order_id):
    """
    Task to send an e-mail notification when an order is 
    successfully created.
    """
    order = Order.objects.get(id=order_id)
    subject = 'Order nr. {}'.format(order.id)
    message = 'Dear {},\n\nYou have successfully placed an order.\
                  Your order id is {}.'.format(order.first_name,
                                               order.id)
    mail_sent = send_mail(subject,
                          message,
                          '[email protected]',
                          [order.email])
    return mail_sent

型
我用的是celery==4.2.0Django==2.0.7 Ubuntu 18.04

已删除：在celery.py中添加了这两行代码。冻结消失了，订单页面现在重定向我进行进一步的付款流程。但任务order_created仍然没有运行。

app.conf.broker_url = 'redis://localhost:6379/1'
    # app.conf.broker_transport_options = {'visibility_timeout': 3600}  # 1 hour.
    app.config_from_object('django.conf:settings', namespace='CELERY')

型

$redis-monitor

输出如下：

OK
1531137225.134559 [1 127.0.0.1:48116] "ZREVRANGE" "book:1:purchased_with" "0" "-1"
1531137240.820217 [1 127.0.0.1:48130] "LPUSH" "celery" "{\"body\": \"W1szMV0sIHt9LCB7ImNhbGxiYWNrcyI6IG51bGwsICJlcnJiYWNrcyI6IG51bGwsICJjaGFpbiI6IG51bGwsICJjaG9yZCI6IG51bGx9XQ==\", \"content-encoding\": \"utf-8\", \"content-type\": \"application/json\", \"headers\": {\"lang\": \"py\", \"task\": \"orders.tasks.order_created\", \"id\": \"172d5ec0-9b53-4766-bc04-470631a3a8e4\", \"shadow\": null, \"eta\": null, \"expires\": null, \"group\": null, \"retries\": 0, \"timelimit\": [null, null], \"root_id\": \"172d5ec0-9b53-4766-bc04-470631a3a8e4\", \"parent_id\": null, \"argsrepr\": \"(31,)\", \"kwargsrepr\": \"{}\", \"origin\": \"gen24500@archeski-Inspiron-5558\"}, \"properties\": {\"correlation_id\": \"172d5ec0-9b53-4766-bc04-470631a3a8e4\", \"reply_to\": \"b8b0c8bb-1931-3be2-a044-d588d95c2fe9\", \"delivery_mode\": 2, \"delivery_info\": {\"exchange\": \"\", \"routing_key\": \"celery\"}, \"priority\": 0, \"body_encoding\": \"base64\", \"delivery_tag\": \"249e3deb-489b-4e0b-bde7-54160d3ccaaf\"}}"
1531137464.423873 [0 127.0.0.1:48192] "SELECT" "1"
1531137464.424085 [1 127.0.0.1:48192] "ZREVRANGE" "book:1:purchased_with" "0" "-1"
1531137479.993181 [0 127.0.0.1:48198] "SELECT" "1"
1531137479.993295 [1 127.0.0.1:48198] "PING"
1531137479.994161 [0 127.0.0.1:48200] "SELECT" "1"
1531137479.994260 [1 127.0.0.1:48200] "MULTI"
1531137479.994279 [1 127.0.0.1:48200] "LLEN" "celery"
1531137479.994286 [1 127.0.0.1:48200] "LLEN" "celery\x06\x163"
1531137479.994291 [1 127.0.0.1:48200] "LLEN" "celery\x06\x166"
1531137479.994295 [1 127.0.0.1:48200] "LLEN" "celery\x06\x169"
1531137479.994299 [1 127.0.0.1:48200] "EXEC"
1531137479.994618 [1 127.0.0.1:48200] "SADD" "_kombu.binding.celery" "celery\x06\x16\x06\x16celery"
1531137479.994977 [1 127.0.0.1:48200] "LPUSH" "celery" "{\"body\": \"W1szMl0sIHt9LCB7ImNhbGxiYWNrcyI6IG51bGwsICJlcnJiYWNrcyI6IG51bGwsICJjaGFpbiI6IG51bGwsICJjaG9yZCI6IG51bGx9XQ==\", \"content-encoding\": \"utf-8\", \"content-type\": \"application/json\", \"headers\": {\"lang\": \"py\", \"task\": \"orders.tasks.order_created\", \"id\": \"0fbcecc4-293d-472b-8308-46cb2d9ff345\", \"shadow\": null, \"eta\": null, \"expires\": null, \"group\": null, \"retries\": 0, \"timelimit\": [null, null], \"root_id\": \"0fbcecc4-293d-472b-8308-46cb2d9ff345\", \"parent_id\": null, \"argsrepr\": \"(32,)\", \"kwargsrepr\": \"{}\", \"origin\": \"gen24983@archeski-Inspiron-5558\"}, \"properties\": {\"correlation_id\": \"0fbcecc4-293d-472b-8308-46cb2d9ff345\", \"reply_to\": \"f046e6b8-dd2b-30a4-86a5-0de752377bc7\", \"delivery_mode\": 2, \"delivery_info\": {\"exchange\": \"\", \"routing_key\": \"celery\"}, \"priority\": 0, \"body_encoding\": \"base64\", \"delivery_tag\": \"088bae10-976e-4143-8c28-9ed2e254f2d5\"}}"
1531137480.232213 [1 127.0.0.1:48200] "LPUSH" "celery" "{\"body\": \"W1szM10sIHt9LCB7ImNhbGxiYWNrcyI6IG51bGwsICJlcnJiYWNrcyI6IG51bGwsICJjaGFpbiI6IG51bGwsICJjaG9yZCI6IG51bGx9XQ==\", \"content-encoding\": \"utf-8\", \"content-type\": \"application/json\", \"headers\": {\"lang\": \"py\", \"task\": \"orders.tasks.order_created\", \"id\": \"5aa54a37-95da-43c9-b59e-e6797b7cdd2f\", \"shadow\": null, \"eta\": null, \"expires\": null, \"group\": null, \"retries\": 0, \"timelimit\": [null, null], \"root_id\": \"5aa54a37-95da-43c9-b59e-e6797b7cdd2f\", \"parent_id\": null, \"argsrepr\": \"(33,)\", \"kwargsrepr\": \"{}\", \"origin\": \"gen24983@archeski-Inspiron-5558\"}, \"properties\": {\"correlation_id\": \"5aa54a37-95da-43c9-b59e-e6797b7cdd2f\", \"reply_to\": \"f046e6b8-dd2b-30a4-86a5-0de752377bc7\", \"delivery_mode\": 2, \"delivery_info\": {\"exchange\": \"\", \"routing_key\": \"celery\"}, \"priority\": 0, \"body_encoding\": \"base64\", \"delivery_tag\": \"f78cd769-d7fa-43de-aee9-f7bc5a2c78ac\"}}"

型