Mongoose findByIdAndUpdate method not incrementing document value-CodePudding

I am trying to update the like count of job posts in my application using the $inc operator and the findByIdAndUpdate method from Mongoose. The correct document is being retrieved and returned but the like count for the job post never moves up from 0 and no updates are performed in the database collection.

Below is the code I am currently using to perform the update.

Jobs.findByIdAndUpdate(req.params._id , { $inc: {likes: 1}} , {new: true})
.then((ret) => {
    res.send(ret)
})

Job schema

const mongoose = require('mongoose');

let JobSchema = mongoose.Schema({
    student_name: {
        type: String,
        required: true
    },
    subject: {
        type: String,
        required: true
    },
    grade: {
        type: Number,
        required: true
    },
    area: {
        type: String,
        required: true
    },
    desc: {
        type: String,
        required: true
    },
    accepted: {
        type: Boolean,
        required: true,
        default: false
    },
    tutor_name: {
        type: String,
        required: false
    },
} , {collection: 'jobs'});

let Job = mongoose.model('Job' , JobSchema);
module.exports = Job;

Any insight into what is preventing the update from performing would be greatly appreciated

I have tried using two queries, one to retrieve the current likes of a post and another to manually update the doc with the incremented value. I have tried nesting the queries using .then() statements and have also tried the updateOne() and findOneAndUpdate() methods as alternatives. I have tried experimenting with the $set and $inc operators in my queries to see if either of them perform the changes, but neither do.

I am expecting the incremented 'likes' value to be reflected in the database and for the updated job document to be returned and echoed back to the console.

CodePudding user response：

Your schema is missing a likes field, which means Mongoose will remove it from queries/updates (since it doesn't match the schema). Make sure to add it:

likes: {
  type: Number,
  default: 0
}

CodePudding user response：

Can you try something like this (adding [] around update):

Jobs.findByIdAndUpdate(req.params._id , [{ $inc: {likes: 1}}] , {new: true})
.then((ret) => {
    res.send(ret)
})

EDITED:

Jobs.findByIdAndUpdate(req.params._id , [{ $set: {likes: "$likes" 1}}] , {new: true})
.then((ret) => {
    res.send(ret)
})