How do I push my new item without creating new mongoose item-CodePudding

I want to append or push my new items that I input in the array without creating new mongoose schema..what I mean is that I will only push items without creating new _id...Here is my code..

For mongoose.Schema()

const mainSchema = new Schema({
    likes:{
        type:Number,
        max:100000
    },
    people:[{
        key:{type:String},
        name:{type:String}
    }]
},{
    timestamps:true
})

And for the routes that will post my items..

router.route('/item/1').post((req,res) => {

    const { likes, people } = req.body


    const FirstItem = Main({
        likes,
        // people
    })

    FirstItem.people.push(people)

    FirstItem.save()
        .then(likes => res.json('New User Added'))
        .catch(err => res.status(400).json('Error :'   err))

})

As you see I didn't input new Main({}) in my post because I don't wanna create a new _id..but I want to push my items in my array whenever I create another new items....This is how I write it in postman..

{
    "likes":0,
    "people":[
        {
            "key":"Tes22t",
            "name":"Tit213an"
        }
    ]
}

Now if I changed something after posting this in my POST method. like "key":"testetsee","name":"123123123" it will give me an error like this ... "Error :ValidationError: people.0._id: Cast to ObjectId failed for value \"[ { key: 'Tes22t', name: 'Tit213an' } ]\" (type Array) at path \"_id\""

I think my problem here is pushing the item? or the post? or do I just need to update it?

CodePudding user response：

If you only want push an element into people array of that object, you should use updateOne() instead of save()

So the code will like

router.route('/item/1').post((req,res) => {

    const { likes, people } = req.body

    const model = mongoose.model('collection_name', mainSchema);

    model.updateOne({like}, {$addToSet: { people: {$each: people} }})
        .then(likes => res.json('New User Added'))
        .catch(err => res.status(400).json('Error :'   err))


})