How to use aggregrate in mongodb to $match _id

Question

Document:

{
    \"_id\" : ObjectId(\"560c24b853b558856ef193a3\"),
    \"name\" : \"Karl Morrison\",
    \"pic\" : \"\",
    \"language\" : ObjectId(\"560c24b         


        

Answer 1

Try this

const User = require('User')
const mongoose = require("mongoose");


User.aggregate([
  {
    $match: { _id: new mongoose.Types.ObjectId('560c24b853b558856ef193a3') }
  }
])

Answer 2

use toString() method

const User = mongoose.model('User')
User.aggregate([
  {
    $match: { _id: user_id.toString()  }
  }
]

Answer 3

const ObjectId = mongoose.Types.ObjectId;
const User = mongoose.model('User')

User.aggregate([
  {
    $match: { _id: ObjectId('560c24b853b558856ef193a3') }
  }
])