/
features.js
255 lines (228 loc) · 5.07 KB
/
features.js
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const express = require('express')
const bodyParser = require('body-parser')
const {graphqlExpress, graphiqlExpress} = require('apollo-server-express')
const {makeExecutableSchema} = require('graphql-tools')
const {find, filter} = require('lodash')
const {GraphQLScalarType} = require('graphql')
const {Kind} = require('graphql/language')
// 测试数据
const authors = [
{id: 1, firstName: 'Tom', lastName: 'Coleman', state: 'CN'},
{id: 2, firstName: 'Sashko', lastName: 'Stubailo', state: 'CN'},
{id: 3, firstName: 'Mikhail', lastName: 'Novikov', state: 'ENG'}
]
const posts = [
{id: 1, authorId: 1, title: 'Introduction to GraphQL', votes: 2},
{id: 2, authorId: 2, title: 'Welcome to Meteor', votes: 3},
{id: 3, authorId: 2, title: 'Advanced GraphQL', votes: 1},
{id: 4, authorId: 3, title: 'Launchpad is Cool', votes: 7}
]
const notices = [{id: 1, content: '这是 notice', noticeTime: 1524710641}]
const reminds = [{id: 1, content: '这是 remind', endTime: 1524710641}]
// GraphQL schema
const typeDefs = `
scalar Date
enum Country {
CN
ENG
JP
UK
CA
}
"""
消息接口
"""
interface Message {
content: String
}
"""
通知对象
"""
type Notice implements Message {
"""
通知内容
"""
content: String
"""
通知时间
"""
noticeTime: Date
}
"""
提醒对象
"""
type Remind implements Message {
content: String
endTime: Date
}
"""
联合类型 通知 & 提醒
"""
union MessageResult = Notice | Remind
type Author {
"""
流水编号
"""
id: Int!
firstName: String
lastName: String
state(state: Country = CN): String
"""
the list of Posts by this author
"""
posts: [Post]
}
type Post {
id: Int!
title: String
author: Author
votes: Int
}
# 输入类型
input AuthorInput {
firstName: String
lastName: String
state: String
}
# the schema allows the following query:
type Query {
"""
所有文章
"""
posts: [Post]
"""
所有作者
"""
authors: [Author]
author(
"""
作者ID
"""
id: Int!
): Author
searchInterface (text: String!): Message!
searchUnion (text: String!): MessageResult!
}
# this schema allows the following mutation:
type Mutation {
addAuthor (
author: AuthorInput!
): Author
upVotePost (
postId: Int!
): Post
clearVotePost (
postId: Int!
): Post
}
`
// resolvers
const resolvers = {
Query: {
posts: () => posts,
authors: () => authors,
author: (_, {id}) => find(authors, {id}),
searchInterface: (_, {text}) => {
if (text === 'notice') {
return notices[0]
} else {
return reminds[0]
}
},
searchUnion: (_, {text}) => {
if (text === 'notice') {
return notices[0]
} else {
return reminds[0]
}
}
},
Mutation: {
addAuthor: (_, {author}) => {
author.id = authors.length + 1
authors.push(author)
return author
},
upVotePost: (_, {postId}) => {
const post = find(posts, {id: postId})
if (!post) {
throw new Error(`Couldn't find post with id ${postId}`)
}
post.votes += 1
return post
},
clearVotePost: (_, {postId}) => {
const post = find(posts, {id: postId})
if (!post) {
throw new Error(`Couldn't find post with id ${postId}`)
}
post.votes = 0
return post
}
},
Author: {
posts: author => filter(posts, {authorId: author.id})
},
Post: {
author: post => find(authors, {id: post.authorId})
},
Message: {
__resolveType(obj, context, info){
console.log(obj, context, info)
if(obj.noticeTime){
return 'Notice'
}
if(obj.endTime){
return 'Remind'
}
return null
}
},
MessageResult: {
__resolveType(obj, context, info){
console.log(obj, context, info)
if(obj.noticeTime){
return 'Notice'
}
if(obj.endTime){
return 'Remind'
}
return null
}
},
Date: new GraphQLScalarType({
name: 'Date',
description: 'Date custom scalar type',
parseValue(value) {
return new Date(value) // value from the client
},
serialize(value) {
// return new Date(value).getTime()
return new Date(value) // value sent to the client
},
parseLiteral(ast) {
if (ast.kind === Kind.INT) {
return parseInt(ast.value, 10) // ast value is always in string format
}
return null
}
})
}
// Put together a schema
const schema = makeExecutableSchema({
typeDefs,
resolvers
// resolverValidationOptions: {
// requireResolversForResolveType: false
// }
})
// Initialize the app
const app = express()
// The GraphQL endpoint
app.use('/graphql', bodyParser.json(), graphqlExpress({schema}))
// GraphiQL, a visual editor for queries
app.use('/graphiql', graphiqlExpress({endpointURL: '/graphql'}))
// Start the server
app.listen(3000, () => {
console.log('Go to http://localhost:3000/graphiql to run queries!')
})