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Axios で ApolloServer からデータ取得する

Last updated at Posted at 2022-03-14

簡単な内容だが、備忘録。

Apollo Server とは?

GraphQL サーバーを簡単に作れる技術。
簡単なデータの読み取りと書き込みは、

index.ts
import {ApolloServer} from "apollo-server"
import {IResolvers} from "@graphql-tools/utils"

let hello = [ {text: "Hello world!"} ]

const typeDefs = gql`
  type Hello {
    text: String
  }
  type Query {
    hellos: [Hello!]!
  }
  type Mutation {
    addHello(text: String!): Hello!
  }
`

const resolvers: IResolvers = {
  Query: { 
    hellos: () => {
      return hello
    }
  },
  Mutation: {
    addHello: (root, args) => {
      const h = {text: args.text}
      hello = [...hello, h]
      return h
    }
  }
}

const server = new ApolloServer({
  typeDefs,
  resolvers
})

server.listen().then(({url}) => {
  console.log(`Server ready at ${url}`)
})

みたいな感じで、スキーマとリソルバを定義することで 作れる。

Axios でデータ取得

上のサーバーから、Axios でのデータ取得は、

index.js
import axios from "axios"

// データ取得
const result = axios({
  url: "http://localhost:4000/graphql",
  method: "POST",
  data: {
    query: `
    query {
      hellos {
        text
      }
    }
`
  }
})

result.then((r) => {console.log(r.data.data.hellos)})

Axios でのデータ書き込みは、

index.js
import axios from "axios"

const result = axios({
  url: "http://localhost:4000/graphql",
  method: "POST",
  data: {
    query: `
      mutation addHello($text: String) {
        addHello(text: $text) {
          text
        }
      }
`,
    variables: {text: "hello"}
  }
})

と、query と query の $text に挿入される variables を定義することで、できる。

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