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index.js
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index.js
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const express = require('express');
const graphqlHTTP = require('express-graphql');
const { buildSchema } = require('graphql');
const { getAllPosts, getPost } = require('./post');
const { getCommentsByPostId, createComment } = require('./comment');
const app = express();
const schema = buildSchema(`
type Query {
posts: [Post]
post(id: Int): Post
}
type Mutation {
commentOnPost(body: String, postId: Int): MutationResponse
}
type Comment {
id: Int
authorId: Int
body: String
createdAt: Int
postId: Int
}
type Post {
id: Int
title: String
body: String
authorId: Int
createdAt: Int
comments: [Comment]
}
enum ResultCode {
SUCCESS, FAILURE
}
type MutationResponse {
code: ResultCode
message: String
}
`);
const root = {
posts: async (args) => {
return await getAllPosts();
},
post: async ({id}) => {
const post = await getPost(id);
return {...post, comments: await getCommentsByPostId(id)}
},
commentOnPost: async ({body, postId}) => {
await createComment({
authorId: 123, // should come from request/session/token
body,
postId
})
return {
code: 'SUCCESS'
}
}
}
app.use('/graphql', graphqlHTTP({
schema: schema,
graphiql: true,
rootValue: root
}));
app.listen(4000);