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如何关注,取消关注时,检验对象的id是否存在?

在后台关注或取消关注时,需要检测对象是否存在。有一个方案,就是先找到where存在的对象,然后,子在callback中再检测对象是否存在,不过这样,可能需要有大量的消耗时间。不利于数据库查询。

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