codestates / codestates/UDONDAM

[๐Ÿ”งError_log] ์ด์„ ์˜ / 2021-12-01~2

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> ํ•ด๊ฒฐ๋œ ์—๋Ÿฌ๋ผ๋ฉด ๋ผ๋ฒจ์— 'Complete' ๋ฅผ ๋‹ฌ์•„์ฃผ์„ธ์š”.
> ๋ฏธํ•ด๊ฒฐ๋œ ์—๋Ÿฌ๋ผ๋ฉด ๋ผ๋ฒจ์„ 'In progress' ๋กœ ๋ณ€๊ฒฝํ•ด์ฃผ์„ธ์š”.

### ์–ด๋–ค ์—๋Ÿฌ์ธ๊ฐ€์š”?
1. ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ํ…Œ์ด๋ธ”์„ ๊ตฌ์„ฑํ•˜๊ธฐ ์œ„ํ•ด ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜์„ ํ•  ๋•Œ ์—๋Ÿฌ๊ฐ€ ๋œธ. ํ…Œ์ด๋ธ”์ด ์ƒ์„ฑ๋˜๋‹ค๊ฐ€ ์ค‘๋‹จ๋จ.
2. ๋”๋ฏธ๋ฐ์ดํ„ฐ๋ฅผ ์ƒ์„ฑํ•˜๋Š” seeders๋„ ์œ„์™€ ๋น„์Šทํ•œ ์—๋Ÿฌ๊ฐ€ ๋‚˜์˜ด
3. npm startํ•  ๋•Œ ์—๋Ÿฌ๊ฐ€ ๋œจ๋ฉฐ ์‹คํ–‰์ด ์•ˆ ๋จ. = crashed

### ์—๋Ÿฌ ๋ฉ”์‹œ์ง€

1~2.
```bash
npx sequelize db:migrate

Sequelize CLI [Node: 16.13.0, CLI: 6.3.0, ORM: 6.12.0-alpha.1]

Loaded configuration file "config/config.js".
Using environment "development".
== 20211130050146-create-comment: migrating =======
== 20211130050146-create-comment: migrated (1.135s)

== 20211130050220-create-like: migrating =======
== 20211130050220-create-like: migrated (0.942s)

== 20211130050308-create-user: migrating =======
== 20211130050308-create-user: migrated (1.331s)

== 20211130141634-create-post: migrating =======
node:internal/process/promises:246
triggerUncaughtException(err, true /* fromPromise */);
^
```

3.
```bash
โžœ server (Dev) โœ— npm start

> server@1.0.0 start
> nodemon index.js

[nodemon] 2.0.15
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
node:internal/modules/cjs/loader:936
throw err;
^

Error: Cannot find module './models/index.js'
Require stack:
- /Users/l_siri/Downloads/codestates SEB 33/Final Project/UDONDAM/server/controllers/user.js
- /Users/l_siri/Downloads/codestates SEB 33/Final Project/UDONDAM/server/roters/user.js
- /Users/l_siri/Downloads/codestates SEB 33/Final Project/UDONDAM/server/index.js
```

### ์—๋Ÿฌ ํ•ธ๋“ค๋ง ๋ฐฉ๋ฒ•

1. ๋งˆ์ด๊ทธ๋ ˆ์ด์…˜์˜ ํŒŒ์ผ๋“ค์˜ ์ˆœ์„œ์™€ create column์„ ์ž˜ ๋ด์•ผ ํ•œ๋‹ค. ์™ธ๋ถ€ํ‚ค๋Š” ์›์กฐ๊ฐ€ ๋˜๋Š” ํ…Œ์ด๋ธ”์—์„œ ์ง์ ‘ .then์œผ๋กœ ๋งŒ๋“ค์–ด์ค˜์•ผ ํ•˜๋Š”๋ฐ, ๊ทธ ์ˆœ์„œ๋ฅผ ๋”ฐ์ ธ์•ผ ํ•œ๋‹ค.
- ์˜ˆ์‹œ๋กœ userํ…Œ์ด๋ธ”๊ณผ postํ…Œ์ด๋ธ”์ด 1:n ๊ด€๊ณ„๋ผ๊ณ  ํ•ด๋ณด์ž. ๋˜ํ•œ user์˜ id๋กœ post์˜ userId๊ฐ€ ์—ฐ๊ฒฐ๋˜์–ด์•ผ ํ•œ๋‹ค. ๊ทธ๋Ÿฌ๋ฉด post migrationsํŒŒ์ผ์—๋Š” ๊ธฐ๋ณธ์ ์œผ๋กœ userId๋ฅผ ์ƒ์„ฑํ•˜๋ฉด ์•ˆ ๋œ๋‹ค. ๋Œ€์‹  .then๋ฌธ์œผ๋กœ post์— userId๋ฅผ user.id ๋ ˆํผ๋Ÿฐ์Šค๋กœ ์ถ”๊ฐ€ํ•ด์•ผ ํ•œ๋‹ค.
- ๋˜ํ•œ ํŒŒ์ผ ์ˆœ์„œ์˜ ๊ฒฝ์šฐ, ๋‹ค๋Œ€๋‹ค ๊ด€๊ณ„๋กœ ์ธํ•ด ์‹ ๊ฒฝ ์จ์•ผ ํ•œ๋‹ค. ์˜ˆ์‹œ๋กœ post ํ…Œ์ด๋ธ”์ด tag ํ…Œ์ด๋ธ”๋กœ ์—ฐ๋™๋˜๊ธฐ ์œ„ํ•ด post_tag ํ…Œ์ด๋ธ”์„ ๊ฑฐ์ณ๊ฐ€์•ผ ํ•œ๋‹ค๊ณ  ์ƒ๊ฐํ•ด ๋ณด์ž. ๋˜ํ•œ post:post_tag, post_tag:tag ๊ฐ€ 1:n, n:1์ด์–ด์„œ post์™€ tag๊ฐ€ ๋‹ค๋Œ€๋‹ค ๊ด€๊ณ„์ด๋‹ค. ์ด๋Ÿฌ๋ฉด post๋Š” post_tag์— postId๋ฅผ .then์œผ๋กœ ๋‚ ๋ ค์ค˜์•ผ ํ•˜๊ณ , tag๋Š” post_tag์— .then์œผ๋กœ tagId๋ฅผ ๋‚ ๋ ค์ค˜์•ผ ํ•œ๋‹ค. ๊ทธ๋ ‡๋‹ค๋ฉด post_tag ํ…Œ์ด๋ธ”์ด ๋จผ์ € ์ƒ์„ฑ๋˜์–ด์•ผ ํ•˜๊ณ , ๊ทธ๋‹ค์Œ post, tag ํ…Œ์ด๋ธ”์„ ์ƒ์„ฑํ•ด์„œ post_tag์— ์ปฌ๋Ÿผ์„ ์ถ”๊ฐ€์‹œ์ผœ์ค˜์•ผ ํ•œ๋‹ค.
>
2. seed๋„ table์˜ ๊ด€๊ณ„๋ฅผ ์ƒ๊ฐํ•˜๋ฉฐ ์งœ์•ผ ํ•œ๋‹ค. user๋ฅผ ๋จผ์ € ์งœ๊ณ , ๊ทธ๋‹ค์Œ post๋ฅผ ์งœ์•ผ๋งŒ userId๊ฐ€ ์—ฐ๊ฒฐ๋  ๊ณณ์„ ๋ฐ”๋กœ ์žก๊ฒŒ ๋œ๋‹ค. ๋งŒ์•ฝ post๋ฅผ ๋จผ์ € ์งœ๊ฒŒ ๋œ๋‹ค๋ฉด userId ๋”๋ฏธ๋ฐ์ดํ„ฐ๊ฐ€ ์™ธ๋ž˜ํ‚ค์ž„์—๋„ ์—ฐ๊ฒฐ๋  userํ…Œ์ด๋ธ”์˜ ์ปฌ๋Ÿผ์ด ์—†์–ด์„œ ์—๋Ÿฌ๊ฐ€ ๋‚˜๊ฒŒ ๋  ๊ฒƒ์ด๋‹ค.
>
>
3. index.js๊ฐ€ ๋ฌธ์ œ๋ผ๊ณค ํ•˜๋‚˜, ์ด๊ฑด ๊ทธ๋‹ค์Œ๋„ ์ž˜ ๋ด์•ผ ํ•œ๋‹ค. module์„ ๋ชป ์ฐพ๋Š”๋‹จ๋‹ค. ๊ทธ๋‹ค์Œ controllers/user.js๋ฅผ ์–ธ๊ธ‰ํ•œ๋‹ค.
๊ทธ๋ž˜์„œ user.js ํŒŒ์ผ์„ ๋ณด๋ฉด ์ฒซ ๋ฒˆ์งธ ์ค„์— ๋‹ค์Œ๊ณผ ๊ฐ™์€ ์ฝ”๋“œ๊ฐ€ ๋ฌธ์ œ๊ฐ€ ๋จ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค.

```js
const {user} = require("./models/index.js");
```
์ฆ‰ ๊ฐ€์ ธ์˜ค์ง€ ๋ชปํ•˜๋Š” ๊ฒƒ์ด๋‹ค. ์ € ์ค„์„ ์ฃผ์„ ํ˜น์€ ์•„์˜ˆ ์—†์• ๋ฒ„๋ฆฌ๋ฉด ๋ฌธ์ œ์—†์ด npm start๊ฐ€ ์ž‘๋™๋œ๋‹ค.
์ด๋Š” ๊ฐ™์€ ๋ฐฑ์—”๋“œ ํŒ€์›๋ถ„์ด ๊นœ๋นกํ•œ ์ฝ”๋“œ๋กœ, ์‹ค์ œ๋กœ ์™œ ๋„ฃ์œผ์…จ๋Š”์ง€๋Š” ์ถ”๊ฐ€๋กœ ํ™•์ธํ•ด๋ด์•ผ ํ•œ๋‹ค. ๋‹ค๋งŒ ๋น„์Šทํ•œ ์˜ค๋ฅ˜ ๋ฌธ๊ตฌ๊ฐ€ ๋œจ๋ฉด ๋Œ€์ฒ˜ํ•  ์ˆ˜ ์žˆ์„ ๊ฒƒ ๊ฐ™๋‹ค.

### ์—๋Ÿฌ ํ•ธ๋“ค๋ง์„ ์œ„ํ•ด ์ฐธ๊ณ ํ•œ ๋ ˆํผ๋Ÿฐ์Šค ๋งํฌ

[๋งํฌ](https://victorydntmd.tistory.com/27)

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