mongoose, MonogoDB 연동

이전글 이어서 작성

2022.07.13 - [2022/JavaScript EveryWhere] - express, apollo-server-express, graphql 연동

 

npm install mongoose dotenv

package.json

  "dependencies": {
    "dotenv": "^16.0.1",
    "mongoose": "^6.4.4",
  }

 

db는 몽고디비 아래주소로 설치하거나 도커로 설치하기

1. https://www.mongodb.com/try/download/community

2. 윈도우 도커로 설치

---

 

 

index.js

// .env 파일 내용 불러오기
require('dotenv').config();

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

...

const DB_HOST = process.env.DB_HOST;

...

db.connect(DB_HOST);

 

db.js

const mongoose = require('mongoose')

module.exports = {
    connect: DB_HOST => {
        // Connect to the DB
        mongoose.connect(DB_HOST);
        // Log an error if we fail to connect
        mongoose.connection.on('error', err => {
            console.error(err);
            console.log(
                'MongoDB connection error. Please make sure MongoDB is running.'
            );
            process.exit();
        });
    },

    close: () => {
        mongoose.connection.close();
    }
};
/*
No More Deprecation Warning Options
useNewUrlParser, useUnifiedTopology, useFindAndModify, and useCreateIndex are no longer supported options.
Mongoose 6 always behaves as if useNewUrlParser, useUnifiedTopology, and useCreateIndex are true, and useFindAndModify is false.
Please remove these options from your code.
 */
// https://mongoosejs.com/docs/migrating_to_6.html#no-more-deprecation-warning-options

 

.env

DB_HOST=mongodb://docker:mongopw@localhost:49154

 

---

index.js 전체소스

const express = require('express');
const { ApolloServer, gql } = require('apollo-server-express');
require('dotenv').config();

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

// Run the server on a port specified in our .env file or port 4000
const port = process.env.PORT || 4000;
const DB_HOST = process.env.DB_HOST;

let notes = [
    {
        id: '1',
        content: 'This is a note',
        author: 'Adam Scott'
    },
    {
        id: '2',
        content: 'This is another note',
        author: 'Harlow Everly'
    },
    {
        id: '3',
        content: 'Oh hey look, another note!',
        author: 'Riley Harrison'
    }
];

// 그래프QL 스키마 언어로 스키마를 구성
const typeDefs = gql`
  type Note {
    id: ID
    content: String
    author: String
  }

  type Query {
    hello: String
    notes: [Note]
    note(id: ID): Note
  }

  type Mutation {
    newNote(content: String!): Note
  }
`;

// 스키마 필드를 위한 리졸버 함수 제공
const resolvers = {
    Query: {
        hello: () => 'Hello world!',
        notes: () => notes,
        note: (parent, args) => {
            return notes.find(note => note.id === args.id);
        }
    },
    Mutation: {
        newNote: (parent, args) => {
            let noteValue = {
                id: String(notes.length + 1),
                content: args.content,
                author: 'Adam Scott'
            };
            notes.push(noteValue);
            return noteValue;
        }
    }
};

// 아폴로 서버 설정
const server = new ApolloServer({ typeDefs, resolvers });

const app = express();
db.connect(DB_HOST);
server.start().then(res => {
    // 아폴로 그래프QL 미들웨어를 적용하고 경로를 /api 로 설정
    server.applyMiddleware({ app, path: '/api' });
    app.listen({ port }, () =>
        console.log(
            `GraphQL Server running at http://localhost:${port}${server.graphqlPath}`
        )
    );
})
// https://javascriptsu.wordpress.com/2021/08/02/apollo-error-must-await-server-start/