@Bread09
Bred

Ошибка в пагинации в NodeJS?

В консоле выводить такая ошибка при попытке посмотреть посты user'а (при нажать на кнопку "Назад (посмотреть старые посты user'а)")

[nodemon] starting `node app.js`
Example app listening on port 3000!
Data base connected
(node:7033) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'id' of null
    at /home/bred/Рабочий стол/Папка/Blog/routes/archive.js:83:17
    at processTicksAndRejections (internal/process/task_queues.js:85:5)
(node:7033) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:7033) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
(node:7033) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'id' of null
    at /home/bred/Рабочий стол/Папка/Blog/routes/archive.js:83:17
    at processTicksAndRejections (internal/process/task_queues.js:85:5)
(node:7033) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:7033) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'id' of null
    at /home/bred/Рабочий стол/Папка/Blog/routes/archive.js:83:17
    at processTicksAndRejections (internal/process/task_queues.js:85:5)
(node:7033) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 3)
(node:7033) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'id' of null
    at /home/bred/Рабочий стол/Папка/Blog/routes/archive.js:83:17
    at processTicksAndRejections (internal/process/task_queues.js:85:5)
(node:7033) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 4)


5d51a26fcca25464104849.png
<!-- Pagination { -->
      <div class="pagination m-5">
        <!-- Home -->
        <% if (current == 2) { %>
          <a class="new" href="/">&#9751 Главная</a>
        <% } %>
        <!-- Right -->
        <% if (current > 2) { %>
          <a class="new" href="/archive/<%= Number(current) - 1 %>">&#10096 Вперед</a>
        <% } %>
        <!-- Back -->
        <% if (pages > 0 && current < pages ) { %>
          <a class="old ml-auto" href="/users/<%=_user.login %>/<%= Number(current) + 1 %>">Назад &#10097</a>
        <% } %>
      </div>
<!-- } -->


archive.js

const express = require('express');
const router = express.Router();

const config = require('../config');
const models = require('../models');

function posts(req, res) {
	const userId = req.session.userId;
	const userLogin = req.session.userLogin;
	const perPage = +config.PER_PAGE;
	const page = req.params.page || 1;

	models.Post.find({})
	.skip(perPage * page - perPage)
	.limit(perPage)
	.populate('author')
	.sort({ createdAt: -1 })
	.then(posts => {
		models.Post.countDocuments().then(count => {
			res.render('archive/index', {
				posts,
				current: page,
				pages: Math.ceil(count / perPage),
				user: {
					id: userId,
					login: userLogin
				}
			});
		}).catch(() => {
			throw new Error('Server dead :)')
		});
	}).catch(() => {
			throw new Error('Server dead :)')
		});
}

// Main view
router.get('/', (req, res) => posts(req, res));
router.get('/archive/:page', (req, res) => posts(req, res));

router.get('/posts/:post', (req, res, next) => {
	const url = req.params.post.trim().replace(/ +(?= )/g, '');
	const userId = req.session.userId;
	const userLogin = req.session.userLogin;

	if (!url) {
		const err = new Error('Not Found');
		err.status = 404;
		next(err);
	} else {
		models.Post.findOne({
			url
		}).then(post => {
			if (!post) {
				const err = new Error('Not Found');
				err.status = 404;
				next(err);
			} else {
				res.render('post/post', {
					post,
					user: {
						id: userId,
						login: userLogin
					}
				});
			}
		})
	}
});

//users posts
router.get('/users/:login/:page*?', (req, res) => {
	const userId = req.session.userId;
	const userLogin = req.session.userLogin;
	const perPage = +config.PER_PAGE;
	const page = req.params.page || 1;
	const login = req.params.login;

	models.User.findOne({
		login
	}).then(user => {
		models.Post.find({
			author: user.id
		})
		.skip(perPage * page - perPage)
		.limit(perPage)
		.sort({ createdAt: -1 })
		.then(posts => {
			models.Post.countDocuments({
				author: user.id
			}).then(count => {
				res.render('archive/user', {
					posts,
					_user: user,
					current: page,
					pages: Math.ceil(count / perPage),
					user: {
						id: userId,
						login: userLogin
					}
				});
			}).catch(() => {
				throw new Error('Server dead :)')
			});
		}).catch(() => {
			throw new Error('Server dead :)')
		});
	})

	
});

module.exports = router;
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Решения вопроса 1
@Bread09 Автор вопроса
Bred
models.Post.find({
      author: <b>user</b>
    })
    .skip(perPage * page - perPage)
    .limit(perPage)
    .sort({ createdAt: -1 })
    .then(posts => {
      models.Post.countDocuments({
        author: <b>user</b>
      })
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