mongodb - mongoose 的 findByIdAndUpdate() 不能执行？

Question

Student.findByIdAndUpdate(helper_id,{$push: {"favour": favour}});

为什么我使用上面的代码，该函数不能被执行，使用下面的代码却能执行？

Student.findByIdAndUpdate(helper_id,{$push: {"favour": favour}}).exec()

但是为什么我直接使用 Student.find() 和 Student.findOne(), 不需要 .exec() 也能执行？

Answer 1

Please refer to Mongoose’s documentation

1. findOneAndUpdate([query], [doc], [options], [callback])

It will only be executed if callback is passed.

2. exec is the way of writing promise, replacing callback, and has the same effect as using callback.

For reference.

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