REACT_FULLSTACK [6] Association in Sequelize

김병훈·2021년 9월 16일

REACT_FULLSTACK

REACT-FULLSTACK

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6/10

In Server folder

I'm going to create another Table which is going to store that comment section

make Comments.js file in models folder (Commnets Table in TutorialDB)
copy Posts.js's code and paste all of this in Commnets.js

The only thing that right now I should add to comments will be just the actual comment body.
and check in DB
there are Comments, and Posts table. and Comments table has only commentbody. Like I coded in VSCode

Posts.js (Server)

make code for associate with Comments tabel

Posts.associate = models => {
    Posts.hasMany(models.Comments, {
      onDelete: 'cascade',
    });
  };

drop the Comments tabel and then refresh VsCode,WorkBench
- associate a comment to a post i am just going to add the id for the post which is id from Post Table

creating routes or endpoints are deal with comments

make a Comments.js in route folder (server)
import Posts.js 's statements at the top

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

const { Comments } = require('../models'); 
// this is used to deal with the DB related to comments

module.exports = router;
// in order to make this router work, 
we need to export this at the bottom
because we need to export the router
containing all the endpoints that I'm going to
create related to this route

index.js (server)

inside of this folder so that in our index.js which is the file that like is the entry point of our server , I have to grab this route over here at the top

and then just apply new Router (Comments)

const commentsRouter = require('./routes/Comments');
app.use('/comments', commentsRouter);

now I have my comments route working in my application

create endpoints (Comments.js) server

./routes/Comments
I want to grab only the comments related to specific id. But not the id for the comments . the id for the post
put some codes

router.get('/:postId', async (req, res) => {
  const postId = req.params.postId;
  const comments = await Comments.findAll({ where: { PostId: postId } });
  res.json(comments);
});

test in Postman

now, it sends an empty array but when I add more comments, it should return every single comments that exist for that specific post

for make comments as post request

send a body containing the text that is going to represent the comment , and also the postId that comment is related to.
grab object that im going to send through the body by saying (const comment = req.body),
accessing the comments model, and im going to create a new comment. await Comments.create(comment);
and at the end i can just return res.json(comment)
this is visual representation that this is working

post request in Postman

it returned my body which is exactly what i wrote

but, to get any confirmation go to comment table and check whether there is new comment or not

there is new comment what i send in Postman

get request after post request

김병훈

블록체인 개발자의 꿈을 위하여

이전 포스트

REACT_FULLSTACK [5] Client,Server - individual page based on id (table PK)

다음 포스트

REACT_FULLSTACK [7] Comment section (Client /React)

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REACT_FULLSTACK [6] Association in Sequelize

REACT-FULLSTACK

In Server folder

I'm going to create another Table which is going to store that comment section

Posts.js (Server)

creating routes or endpoints are deal with comments

index.js (server)

create endpoints (Comments.js) server

test in Postman

for make comments as post request

post request in Postman

get request after post request

REACT_FULLSTACK [5] Client,Server - individual page based on id (table PK)

REACT_FULLSTACK [7] Comment section (Client /React)

31개의 댓글

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