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index.js
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index.js
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'use strict';
const express = require('express');
const graphql = require("express-graphql");
const {
GraphQLID,
GraphQLList,
GraphQLNonNull,
GraphQLObjectType,
GraphQLSchema,
GraphQLString
} = require('graphql');
const users = [
{ id: '1', name: 'Maxim' },
{ id: '2', name: 'Alex' }
];
const notes = [
{ id: '1', name: 'Books', text: 'Books to read' },
{ id: '2', name: 'Music', text: 'Music to listen' }
];
const comments = [
{ noteId: '1', userId: '1', text: 'Круто!' },
{ noteId: '1', userId: '2', text: 'А мне не очень понравилось' }
];
const server = express();
const UserType = new GraphQLObjectType({
name: 'User',
fields: {
id: { type: GraphQLID },
name: { type: GraphQLString }
}
});
const CommentType = new GraphQLObjectType({
name: 'Comment',
fields: {
text: { type: GraphQLString },
author: {
type: UserType,
resolve: parentValue =>
users.find(user => user.id === parentValue.userId)
}
}
});
const NoteType = new GraphQLObjectType({
name: 'Note',
fields: {
id: { type: GraphQLID },
name: { type: GraphQLString },
text: { type: GraphQLString },
comments: {
type: new GraphQLList(CommentType),
args: {
userId: { type: GraphQLID }
},
resolve: (parentValue, { userId }) =>
comments.filter(comment =>
comment.noteId === parentValue.id && (!userId || userId === comment.userId)
)
}
}
});
const QueryType = new GraphQLObjectType({
name: 'Query',
fields: {
notes: {
type: new GraphQLList(NoteType),
resolve: () => notes
},
note: {
type: NoteType,
args: {
name: { type: new GraphQLNonNull(GraphQLString) }
},
resolve: (parentValue, { name }) =>
notes.find(note => note.name === name)
}
}
});
const MutationType = new GraphQLObjectType({
name: 'Mutation',
fields: {
createNote: {
type: NoteType,
args: {
name: { type: new GraphQLNonNull(GraphQLString) },
text: { type: new GraphQLNonNull(GraphQLString) }
},
resolve: (parentValue, { name, text }) => {
const note = { id: Math.random(), name, text };
notes.push(note);
return note;
}
}
}
});
const schema = new GraphQLSchema({
query: QueryType,
mutation: MutationType
});
server.use('/graphql', graphql({ schema, graphiql: true }));
server.listen(3000, () =>
console.log('Listening on http://localhost:3000/graphql')
);