使用 Nodejs 向 MongoDb 插入数据

Question

I have couple of objects inside my Mongodb in a collection example of an object is :

_id: xxxxxxxxxxxxxxxxxxxx
abcd:
    efgh: " "

where abcd is an object which contains array of efgh and I want to push data inside the array efgh (which means add data into that particular _id and into efgh when that api is triggered)

I wrote an api for that

app.put('/route/:id', function(req, res, next){
    //console.log(req.params.id)
    console.log(req);
    collection.findByIdAndUpdate({abcd:req.params.id}, req.body.abcd).then(function(collection){
        res.send(collection)
    })
})

but when I tried it in postman it didn't work can u please help me with this.

Answer 1

Your second arguments must use $set and the first argument must match for the id:

collection
  .findByIdAndUpdate(req.params.id, {$set: { abcd: req.body.abcd })
  .then(function(collection) {
    res.send(collection);
  });

Answer 2

If you want yo push inside array, MongoDB provides $push or $addToSet.

collection.findByIdAndUpdate({_id :req.params.id}, {$addToSet: { "abcd.efgh": req.body.abcd.efgh } }).then(function(collection){
    res.send(collection)
});