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我正在开发一个 Django 博客,我需要能够安排帖子在以后发布。Celery 非常适合最初安排帖子,但是当用户尝试更新帖子以使其重新安排或无限期取消时,我遇到了问题。

这是我正在尝试做的事情:

def save(self, **kwargs):
    ''' 
    Saves an event. If the event is currently scheduled to publish, 
    sets a celery task to publish the event at the selected time.  
    If there is an existing scheduled task,cancel it and reschedule it 
    if necessary.
    ''' 
    import celery
    this_task_id = 'publish-post-%s' % self.id 
    celery.task.control.revoke(task_id=this_task_id)

    if self.status == self.STATUS_SCHEDULED:
        from blog import tasks
        tasks.publish_post.apply_async(args=[self.id], eta=self.date_published,
                task_id=this_task_id) 
    else:
        self.date_published = datetime.now()

    super(Post, self).save(**kwargs)

问题是,一旦 Celery 任务 ID 被列为已撤销,即使我尝试重新安排它,它仍会保持撤销状态。这似乎是一项足够常见的任务,应该有一个简单的解决方案。

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1 回答 1

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我不知道您的 tasks.py 文件是什么样的,但我认为它类似于以下内容:

from celery.decorators import task

@task
def publish_post(post_id):
    ''' Sets the status of a post to Published '''
    from blog.models import Post

    Post.objects.filter(pk=post_id).update(status=Post.STATUS_PUBLISHED)

您应该在任务中编辑过滤器以确保当前状态为 STATUS_SCHEDULED 并且 date_published 中的时间已过。例如:

from celery.decorators import task

@task
def publish_post(post_id):
    ''' Sets the status of a post to Published '''
    from blog.models import Post
    from datetime import datetime

    Post.objects.filter(
        pk=post_id,
        date_published__lte=datetime.now(),
        status=Post.STATUS_SCHEDULED
    ).update(status=Post.STATUS_PUBLISHED)

这样,用户可以来回更改状态,更改时间,并且如果任务在 date_published 列之后运行,则任务只会更改要发布的状态。无需跟踪 ID 或撤销任务。

于 2010-12-22T16:11:23.033 回答