芹菜结果错误"args必须是列表或元组"

Question

我正在运行一个Django网站并且刚刚让Celery运行,但是我遇到了令人困惑的错误.以下是代码的结构.

在tests.py中:

from tasks import *
from celery.result import AsyncResult

project = Project.objects.create()
# initalize various sub-objects of the project

c = function.delay(project.id)
r = AsyncResult(c.id).ready()
f = AsyncResult(c.id).failed()
# wait until the task is done  
while not r and not f:
    r = AsyncResult(c.id).ready()
    f = AsyncResult(c.id).failed()

self.assertEqual() #will fail because task fails

在tasks.py中:

from __future__ import absolute_import
from celery import shared_task

@shared_task
def function(project_id)
    #a bunch of calculations followed by a save of the project
    project = Project.objects.get(project=project_id)

    for part in project.part_set.all():
        partFunction(part.id)
        p = Part.objects.get(id=part.id)
        # add to various variables in project from variables in p
    project.save()

在mainapp/settings.py中:

BROKER_URL = "amqp://ipaddress"
CELERY_RESULT_BACKEND='amqp'
CELERY_ACCEPT_CONTENT = ['json','pickle','msgpack','yaml']
CELERY_IGNORE_RESULT = False

celery调试控制台日志必须通过list/tuple:

[INFO/MainProcess] Received task: myapp.tasks.function[id]
[ERROR/MainProcess] Task myapp.tasks.function[id]
    raised unexpected: ValueError('task args must be a list or tuple',)
Traceback:
   File "/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task
       R = retval = fun(*args, **kwargs)
   File "/python2.7/site-packages/celery/app/trace.py", line 437, in __protected_call__
       return self.run(*args, **kwargs)
   File "/myapp/tasks.py", line 28, in function
       p = Part.objects.get(id=part.id)
   File "/python2.7/site-packages/celery/app/task.py", line 555, in apply_async
       **dict(self._get_exec_options(), **options)
   File "/python2.7/site-packages/celery/app/base.py", line 351, in send_task
       reply_to=reply_to or self.oid, **options
   File "celery/app/amqp.py", line 252, in publish_task
       raise ValueError('task args must be a list or tuple')
ValueError: task args must be a list or tuple

我得到的错误如上所述AsyncResult(c.id).result: task args must be a list or tuple.这应该是一个简单的解决方案,但事实并非如此.当我把它变成这样的列表时:

inline = [project.id]
c = function.delay(inline)

然后它改变了主意并告诉我 AsyncResult(c.id).result: int() argument must be a string or a number, not 'list'

你可以想象我对可能出现的问题非常困惑.

---

编辑

tasks.py

@shared_task
def function(app):
    @app.task(name='myapp.function', bind=True)
    def function(project_id):

tests.py

c = function.s(project.id).delay()

function.app打印

Answer 1

您在任务中的代码中收到错误,它在回溯中显示:

File "/myapp/tasks.py", line 28, in function
   p = Part.objects.get(id=part.id)

你的代码似乎是正确的,但从追溯看起来,芹菜有一个旧版本的任务腌制.非常重要的是,每当你改变内部的任何东西时你都会重新启动芹菜task.py(即使你改变了其他文件,但我不这么认为).这可能是你问题的原因,它让我陷入困境几次.

此外,没有理由part单独从数据库中提取数据库,p = Part.objects.get(id=part.id)因为在迭代查询集时已经获得了当前的部分实例for part in project.part_set.all():.这只是一个建议,你可能有更多的代码需要这一步.

作为旁注,如果它是您项目中的任务而不是某些可重用应用程序的一部分,只需使用常规@task装饰器,芹菜会找到它,但请确保您Celery正确配置应用程序,这是我的另一个帖子可以指导您完成:Celery/Django Single Tasks多次运行

因此,只要您正确配置了所有内容,就像以前一样使用它:

@task #or @shared_task
def function(project_id)
    #a bunch of calculations followed by a save of the project
    project = Project.objects.get(project=project_id)
    ....

然后叫它:

result = function.delay(project.id)

要么:

result = function.apply_async(args=(project.id,))

显然我也建议不用芹菜直接调用它来测试任务function(project.id),但我相信你知道的.