javascript Criando变异e解析器graphql
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import { GraphQLServer } from 'graphql-yoga'
import uuidv4 from 'uuid/v4'
// Scalar types - String, Boolean, Int, Float, ID
// Demo user data
const users = [{
id: '1',
name: 'Andrew',
email: 'andrew@example.com',
age: 27
}, {
id: '2',
name: 'Sarah',
email: 'sarah@example.com'
}, {
id: '3',
name: 'Mike',
email: 'mike@example.com'
}]
const posts = [{
id: '10',
title: 'GraphQL 101',
body: 'This is how to use GraphQL...',
published: true,
author: '1'
}, {
id: '11',
title: 'GraphQL 201',
body: 'This is an advanced GraphQL post...',
published: false,
author: '1'
}, {
id: '12',
title: 'Programming Music',
body: '',
published: false,
author: '2'
}]
const comments = [{
id: '102',
text: 'This worked well for me. Thanks!',
author: '3',
post: '10'
}, {
id: '103',
text: 'Glad you enjoyed it.',
author: '1',
post: '10'
}, {
id: '104',
text: 'This did no work.',
author: '2',
post: '11'
}, {
id: '105',
text: 'Nevermind. I got it to work.',
author: '1',
post: '11'
}]
// Type definitions (schema)
const typeDefs = `
type Query {
users(query: String): [User!]!
posts(query: String): [Post!]!
comments: [Comment!]!
me: User!
post: Post!
}
type Mutation {
createUser(name: String!, email: String!, age: Int): User!
}
type User {
id: ID!
name: String!
email: String!
age: Int
posts: [Post!]!
comments: [Comment!]!
}
type Post {
id: ID!
title: String!
body: String!
published: Boolean!
author: User!
comments: [Comment!]!
}
type Comment {
id: ID!
text: String!
author: User!
post: Post!
}
`
// Resolvers
const resolvers = {
Query: {
users(parent, args, ctx, info) {
if (!args.query) {
return users
}
return users.filter((user) => {
return user.name.toLowerCase().includes(args.query.toLowerCase())
})
},
posts(parent, args, ctx, info) {
if (!args.query) {
return posts
}
return posts.filter((post) => {
const isTitleMatch = post.title.toLowerCase().includes(args.query.toLowerCase())
const isBodyMatch = post.body.toLowerCase().includes(args.query.toLowerCase())
return isTitleMatch || isBodyMatch
})
},
comments(parent, args, ctx, info) {
return comments
},
me() {
return {
id: '123098',
name: 'Mike',
email: 'mike@example.com'
}
},
post() {
return {
id: '092',
title: 'GraphQL 101',
body: '',
published: false
}
}
},
Mutation: {
createUser(parent, args, ctx, info) {
const emailTaken = users.some((user) => user.email === args.email)
if (emailTaken) {
throw new Error('Email taken')
}
const user = {
id: uuidv4(),
name: args.name,
email: args.email,
age: args.age
}
users.push(user)
return user
}
},
Post: {
author(parent, args, ctx, info) {
return users.find((user) => {
return user.id === parent.author
})
},
comments(parent, args, ctx, info) {
return comments.filter((comment) => {
return comment.post === parent.id
})
}
},
Comment: {
author(parent, args, ctx, info) {
return users.find((user) => {
return user.id === parent.author
})
},
post(parent, args, ctx, info) {
return posts.find((post) => {
return post.id === parent.post
})
}
},
User: {
posts(parent, args, ctx, info) {
return posts.filter((post) => {
return post.author === parent.id
})
},
comments(parent, args, ctx, info) {
return comments.filter((comment) => {
return comment.author === parent.id
})
}
}
}
const server = new GraphQLServer({
typeDefs,
resolvers
})
server.start(() => {
console.log('The server is up!')
})
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