Lecture 385:- Actions and Routes - Likes

To enable liking posts in our app, we need to define the necessary actions and routes. Here's how we can do that:

1. Create a new likesController.js file in the controllers directory.
2. Define the following actions in the likesController.js file:
   • likePost: This action will be used to like a post. It will create a new like record in the database and associate it with the post and the user who liked it.
   • unlikePost: This action will be used to unlike a post. It will find the like record for the post and the user who liked it, and then delete it from the database.
3. Define the following routes in the routes.js file:
   • POST /likes/:postId/like: This route will call the likePost action when a user likes a post.
   • DELETE /likes/:postId/unlike: This route will call the unlikePost action when a user unlikes a post.

Here's an example implementation of the likesController.js file:

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const Post = require('../models/post'); const Like = require('../models/like'); module.exports.likePost = async function (req, res) {  try {    let post = await Post.findById(req.params.postId);    // Check if the post already has a like from the current user    let existingLike = await Like.findOne({      user: req.user._id,      post: req.params.postId,    });    if (!existingLike) {      // Create a new like record      let newLike = await Like.create({        user: req.user._id,        post: req.params.postId,      });      post.likes.push(newLike);      post.save();    }    return res.json(200, {      message: 'Post liked',    });  } catch (err) {    console.log('Error in liking post', err);    return res.json(500, {      message: 'Internal Server Error',    });  } }; module.exports.unlikePost = async function (req, res) {  try {    let post = await Post.findById(req.params.postId);    // Find the like record for the post and the current user    let existingLike = await Like.findOne({      user: req.user._id,      post: req.params.postId,    });    if (existingLike) {      // Remove the like record      existingLike.remove();      // Remove the like from the post's likes array      post.likes.pull(existingLike._id);      post.save();    }    return res.json(200, {      message: 'Post unliked',    });  } catch (err) {    console.log('Error in unliking post', err);    return res.json(500, {      message: 'Internal Server Error',    });  } };

And here's an example implementation of the routes.js file:

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const express = require('express'); const router = express.Router(); const passport = require('passport'); const likesController = require('../controllers/likesController'); router.post(  '/likes/:postId/like',  passport.authenticate('jwt', { session: false }),  likesController.likePost ); router.delete(  '/likes/:postId/unlike',  passport.authenticate('jwt', { session: false }),  likesController.unlikePost ); module.exports = router;