django-celery use django orm can't get query set

[lowmanisbusy]

my task is using the django orm to get the datas, but if the data is new created, task always can't get it(query not exist, the true is it was created successed). but if i call the task in twice, the second time will be ok. I don't known why, may be I am stupid or I leave out something. my english is not so good, I expect you can understand what say.