GraphQL + MongoDB 연동하기

1. Graphql-yoga 설치

- yarn add grapql-yoga

2. MongoDB 설치 및 mLab

- yarn add mongoose

- mLab 가입 후 deployment 생성 후 URL 생성

3. 코드 작성

[ index.js ]

import { GraphQLServer } from "graphql-yoga";

import mongoose from "mongoose";

mongoose.Promise = global.Promise;

mongoose.connect(

'mongodb://<dbuser>:<dbpassword>@~~~~', // mLab URL 삽입 dbuser: 아이디, dbpassword: 비밀번호

{useNewUrlParser : true});

mongoose.connection.once('open', () => {

    console.log('MongoDB Connected...');

});

const server = new GraphQLServer({

  typeDefs: "graphql/schema.graphql",

  resolvers

});

server.start(() => console.log("Graphql Server Running"));

[ Movie.js ]

import mongoose from "mongoose";

const Schema = mongoose.Schema;

const movieSchema = new Schema({

  id: String,

  title: String,

  rating: Number,

});

export default mongoose.model('Movie', movieSchema);

[ schema.graphql ]

type Movie {

  id: Int!

  title: String!

  rating: Float

}

type Query {

  movie(title: String!): Movie

}

type Mutation {

  addMovie(title:String!, rating: Float): Boolean!

}

[ resolver.js ]

import Movie from './Movie';

const resolvers = {

  Query: {

    movie: (_, { title }) => {

      return Movie.findOne({title}); // 데이터베이스에서 특정 하나의 데이터 조회

    },

  },

  Mutation: {

    addMovie: async (_, { title, rating }) => {

      let movie = new Movie({

        title,

        rating

      });

      return movie.save(); // 데이터베이스에 저장

    }

  }

};

export default resolvers;

4. 실행

- yarn start 후 localhost:4000 (Playground) 접속

- query 또는 mutation => mLab Collections에 데이터 생성 확인