graphql__egghead_tutorial/index.js

'use strict';

const express = require('express');
const graphqlHTTP = require('express-graphql');
const {
  GraphQLBoolean,
  GraphQLID,
  GraphQLInputObjectType,
  GraphQLInt,
  GraphQLList,
  GraphQLNonNull,
  GraphQLObjectType,
  GraphQLSchema,
  GraphQLString
} = require('graphql');

const {
  globalIdField
} = require('graphql-relay');

const {
  createVideo,
  getVideoById,
  getVideos
} = require('./src/data/index');

const {
  nodeInterface,
  nodeField
} = require("./src/node");

const PORT = process.env.PORT || 3000;

const server = express();

const videoInputType = new GraphQLInputObjectType({
  name: "VideoInput",
  fields: {
    title: {
      type: new GraphQLNonNull(GraphQLString),
      description: 'The title of the video'
    },
    duration: {
      type: new GraphQLNonNull(GraphQLInt),
      description: 'The duration of the video, in seconds'
    },
    released: {
      type: new GraphQLNonNull(GraphQLBoolean),
      description: "Whether or not the video is released"
    }
  }
});

const videoType = new GraphQLObjectType({
  name: 'Video',
  description: 'A video on egghead.io',
  fields: {
    id: globalIdField(),
    title: {
      type: GraphQLString,
      description: 'The title of the video'
    },
    duration: {
      type: GraphQLInt,
      description: 'The duration of the video, in seconds'
    },
    watched: {
      type: GraphQLBoolean,
      description: 'Whether or not the viewer has watched the video'
    }
  },
  interfaces: [nodeInterface]
});
exports.videoType = videoType;

const queryType = new GraphQLObjectType({
  name: 'QueryType',
  description: 'The root query  type',
  fields: {
    node: nodeField,
    video: {
      type: videoType,
      args: {
        id: {
          type: new GraphQLNonNull(GraphQLID),
          description: 'The ID of the video'
        }
      },
      resolve: (_, args) => {
        return getVideoById(args.id);
      }
    },
    videos: {
      type: new GraphQLList(videoType),
      // General form:
      // resolve: () => getVideos()
      // Shortcut:
      resolve: getVideos
    }
  }
});

/* Example mutation use:

mutation M {
 createVideo(video: {
   title: "A new hope",
   duration: 7260,
   released: true
 }) {
   id,
   title
   }
 }
 */

const mutationType = new GraphQLObjectType({
  name: 'Mutation',
  description: "The root Mutation type",
  fields: {
    createVideo: {
      type: videoType,
      args: {
        video: {
          type: new GraphQLNonNull(videoInputType)
        }
      },
      resolve: (_, args) => {
        return createVideo(args.video);
      }
    }
  }
});

const schema = new GraphQLSchema({
  mutation: mutationType,
  query: queryType
  // Also available:
  // subscription: ...
});

server.use('/graphql', graphqlHTTP({
  schema,
  graphiql: true
}));

server.listen(PORT, () => {
  console.log(`Listening on http://localhost:${PORT}`);
});