This is my save operation, but the output order of the print statements isB: undefined A: correct content
router.post('/reply', (req, res, next) => {
let topic_id = req.body.topic_id,
content = req.body.content
let replyEntity = new replyModel({
author: req._id,
topic: topic_id,
content
})
replyEntity.save((err, _new_reply) => {
if (err) {
return res.json({
status: -1
})
}
console.log('A: '+_new_reply)
return _new_reply
})
.then((reply) => {
console.log('B: '+reply)
return res.json({
status: 0
})
})
})
Why?then
The contents of the operation will be executed first and should not wait for me.save promise
Did you just go back and do it?
I have already specifiedmongoose.Promise = Promise;
I hope someone can help me solve it.
You’re confused,
replyEntity.save((err, _new_reply) => { if (err) { return res.json({ status: -1 }) } console.log('A: '+_new_reply) return _new_reply }) .then((reply) => { console.log('B: '+reply) return res.json({ status: 0 }) }) })
You got callback and promise together