Пн goose findById не обновляет запись

Question

Я пытаюсь обновить документ json с помощью findById, но он не работает. Ниже мой код

const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const cors = require('cors');
const mongoose = require('mongoose');
const todoRoutes = express.Router();
const PORT = 4000;

let Todo = require('./todo-model');

app.use(cors());
app.use(bodyParser.json());

mongoose.connect('mongodb://127.0.0.1:27017/todos', { useNewUrlParser: true });
const connection = mongoose.connection;

connection.once('open', function() {
    console.log("MongoDB database connection established successfully");
})

todoRoutes.route('/update/:id').post(function(req, res) {
Todo.findById(req.params.id, function(err, todo) {
    if (!todo)
        res.status(404).send("data is not found");
    else
        todo.todo_description = req.body.todo_description;
        todo.todo_responsible = req.body.todo_responsible;
        todo.todo_priority = req.body.todo_priority;
        todo.todo_completed = req.body.todo_completed;

        todo.save().then(todo => {
            res.json('Todo updated!');
        })
        .catch(err => {
            res.status(400).send("Update not possible");
        });


 });
});


app.use('/todos', todoRoutes);

app.listen(PORT, function() {
    console.log("Server is running on Port: " + PORT);
});

И я использую Почтальон для его проверки:

http://localhost: 4000 / todos / update / 5e8e36f4342fd033e4f50cb6

{"todo_description": "Richard", "todo_responsible": "Чистая комната", "todo_priority": "Средний", "todo_completed": "true"}