15-12-7

比方说：我有一个post对象：
var query = new AV.Query("Post");
query.equalTo('something', something);
query.include('owner');
query.first().then(function(post) {
post.fetchWhenSave(true);
post.set('something', something);
post.save(); //save后, post的owner就没有被include了; 我想在save后owner依然是被include的
});