使用celery更新Django模型字段时避免使用递归save()

Question

我重写模型的save()方法来调用Celery的异步任务.该任务还保存了模型,因此我最终得到了重复调用Celery任务的递归情况.这是代码:

模型的保存方法:

def save(self, *args, **kwargs):
    super(Route, self).save(*args, **kwargs)
    from .tasks import get_elevation_data
    get_elevation_data.delay(self)

get_elevation_data任务:

from celery.decorators import task

@task()
def get_elevation_data(route):
    ...
    route.elevation_data = results
    route.save()

我怎样才能避免这种递归？

Answer 1

添加一个关键字参数,告诉save不要递归:

 def save(self, elevation_data=True, *args, **kwargs):
   super(Route, self).save(*args, **kwargs)
   if elevation_data:
     from .tasks import get_elevation_data
     get_elevation_data.delay(self)

然后:

 from celery.decorators import task

 @task()
 def get_elevation_data(route):
     ...
     route.elevation_data = results
     route.save(elevation_data=False)