graphql-patika-odev-1

index.js

const { ApolloServer, gql } = require("apollo-server");
const { events, locations, participants, users } = require("./data");

const typeDefs = gql`
  type event {
    id: ID!
    title: String!
    desc: String!
    date: String!
    from: String!
    to: String!
    location_id: Int!
    user_id: Int!
    participants: [participant!]!
  }

  type location {
    id: ID!
    name: String!
    desc: String!
    lat: Float!
    lng: Float!
    event: event
  }

  type user {
    id: ID!
    username: String!
    email: String!
    participants: [participant!]!
    event: event
  }

  type participant {
    id: ID!
    user_id: ID!
    event_id: ID!
  }

  type Query {
    users: [user!]!
    user(id: ID!): user

    events: [event!]!
    event(id: ID!): event

    locations: [location!]!
    location(id: ID!): location

    participants: [participant!]!
    participant(id: ID!): participant
  }
`;

const resolvers = {
  Query: {
    users: () => users,
    user: (parent, args) => users.find((user) => user.id == args.id),

    events: () => events,
    event: (parent, args) => events.find((event) => event.id == args.id),

    locations: () => locations,
    location: (parent, args) =>
      locations.find((location) => location.id == args.id),

    participants: () => participants,
    participant: (parent, args) =>
      participants.find((participant) => participant.id == args.id),
  },

  event: {
    participants: (parent, args) =>
      participants.filter((participant) => participant.user_id === parent.id),
  },

  user: {
    participants: (parent, args) =>
      participants.filter((participant) => participant.user_id === parent.id),
    event: (parent, args) => events.find((event) => event.id === parent.id),
  },

  location: {
    event: (parent, args) => events.find((event) => event.id === parent.id),
  },
};

const server = new ApolloServer({ typeDefs, resolvers });
server.listen().then(({ url }) => {
  console.log(`Server ready at ${url}`);
});