kabece

func (r *queryResolver) ChatRoom(ctx context.Context, id string) (*model.ChatRoom, error) {
  if t, ok := r.ChatRooms[id]; ok {
    return &t, nil
  }
  return nil, errors.New("chat room not found")
}

kabece

srv := handler.NewDefaultServer(generated.NewExecutableSchema(graph.NewResolver()))

kabece

func (r *chatRoomResolver) MessagesConnection(ctx context.Context, 
  obj *model.ChatRoom, first *int, after *string) (*model.MessagesConnection, error) {
    panic(fmt.Errorf("not implemented"))
}

func (r *queryResolver) ChatRoom(ctx context.Context, id string) (*model.ChatRoom, error) {
  panic(fmt.Errorf("not implemented"))
}

kabece

package model

type ChatRoom struct {
  ID string
  Name string
}

kabece

package model

type ChatRoom struct {
  ID string `json:"id"`
  MessagesConnection *MessagesConnection `json:"messagesConnection"`
}

type Message struct {
  ID string  `json:"id"`
  Text *string `json:"text"`

kabece

type Message {  
  id: ID!
  text: String
}

type ChatRoom {
  id: ID!
  name: String
  messagesConnection: # this is what we're going to implement
}

kabece

import { relayStylePagination } from '@apollo/client/utilities'

const client = new ApolloClient({
  uri: 'http://localhost:4000/query',
  cache: new InMemoryCache({
    typePolicies: {
      ChatRoom: {
        fields: {
          messagesConnection: relayStylePagination(),
        },

kabece

query {
  chatRoom(id: 1) {
    id
    name
    messagesConnection(first: 10) {
      edges {
        node {
          id
          text
        }

kabece

func (r *chatRoomResolver) MessagesConnection(ctx context.Context, obj *model.ChatRoom, 
  first *int, after *string) (*model.MessagesConnection, error) {
    
  // The cursor is base64 encoded by convention, so we need to decode it first
  var decodedCursor string
  if after != nil {
    b, err := base64.StdEncoding.DecodeString(*after)
    if err != nil {
      return nil, err
    }

kabece

package graph

import (
  "fmt"
  "math/rand"
  "strconv"
  "time"

  "github.com/kabece/gqlgen-chatroom/graph/generated"
  "github.com/kabece/gqlgen-chatroom/graph/model"