채널 관련해서 2가지 에러가 발생했는데 원인을 못찾겠습니다..

Question

1. 로그인을 성공하면, 회원에 대한 정보도 정상적으로 가져오고 화면은 정상적으로 나오지만,
useSWR을 통해 체널 데이터를 못가져오는 것 같습니다.

2. 채널 만들기를 하면 500 에러가 발생합니다.

query: SELECT DISTINCT `distinctAlias`.`Users_id` AS `ids_Users_id` FROM (SELECT `Users`.`id` AS `Users_id`, `Users`.`email` AS `Users_email`, `Users`.`nickname` AS `U
sers_nickname`, `Users__Users_Workspaces`.`id` AS `Users__Users_Workspaces_id`, `Users__Users_Workspaces`.`name` AS `Users__Users_Workspaces_name`, `Users__Users_Works
paces`.`url` AS `Users__Users_Workspaces_url`, `Users__Users_Workspaces`.`createdAt` AS `Users__Users_Workspaces_createdAt`, `Users__Users_Workspaces`.`updatedAt` AS `
Users__Users_Workspaces_updatedAt`, `Users__Users_Workspaces`.`deletedAt` AS `Users__Users_Workspaces_deletedAt`, `Users__Users_Workspaces`.`OwnerId` AS `Users__Users_
Workspaces_OwnerId` FROM `users` `Users` LEFT JOIN `workspacemembers` `Users_Users__Users_Workspaces` ON `Users_Users__Users_Workspaces`.`UserId`=`Users`.`id` LEFT JOI
N `workspaces` `Users__Users_Workspaces` ON `Users__Users_Workspaces`.`id`=`Users_Users__Users_Workspaces`.`WorkspaceId` AND (`Users__Users_Workspaces`.`deletedAt` IS 
NULL) WHERE ( (`Users`.`id` = ?) ) AND ( `Users`.`deletedAt` IS NULL )) `distinctAlias` ORDER BY `Users_id` ASC LIMIT 1 -- PARAMETERS: [5]
query: SELECT `Users`.`id` AS `Users_id`, `Users`.`email` AS `Users_email`, `Users`.`nickname` AS `Users_nickname`, `Users__Users_Workspaces`.`id` AS `Users__Users_Wor
kspaces_id`, `Users__Users_Workspaces`.`name` AS `Users__Users_Workspaces_name`, `Users__Users_Workspaces`.`url` AS `Users__Users_Workspaces_url`, `Users__Users_Worksp
aces`.`createdAt` AS `Users__Users_Workspaces_createdAt`, `Users__Users_Workspaces`.`updatedAt` AS `Users__Users_Workspaces_updatedAt`, `Users__Users_Workspaces`.`dele
tedAt` AS `Users__Users_Workspaces_deletedAt`, `Users__Users_Workspaces`.`OwnerId` AS `Users__Users_Workspaces_OwnerId` FROM `users` `Users` LEFT JOIN `workspacemember
s` `Users_Users__Users_Workspaces` ON `Users_Users__Users_Workspaces`.`UserId`=`Users`.`id` LEFT JOIN `workspaces` `Users__Users_Workspaces` ON `Users__Users_Workspace
s`.`id`=`Users_Users__Users_Workspaces`.`WorkspaceId` AND (`Users__Users_Workspaces`.`deletedAt` IS NULL) WHERE ( (`Users`.`id` = ?) ) AND ( `Users`.`deletedAt` IS NUL
L ) AND ( `Users`.`id` IN (5) ) -- PARAMETERS: [5]
user Users {
  id: 5,
  email: 'qqq123@naver.com',
  nickname: 'Quit',
  Workspaces: [
    Workspaces {
      id: 1,
      name: 'Sleact',
      url: 'select',
      createdAt: 2022-08-20T04:04:09.828Z,
      updatedAt: 2022-08-20T04:04:09.828Z,
      deletedAt: null,
      OwnerId: null
    }
  ]
}
query: SELECT `Workspaces`.`id` AS `Workspaces_id`, `Workspaces`.`name` AS `Workspaces_name`, `Workspaces`.`url` AS `Workspaces_url`, `Workspaces`.`createdAt` AS `Work
spaces_createdAt`, `Workspaces`.`updatedAt` AS `Workspaces_updatedAt`, `Workspaces`.`deletedAt` AS `Workspaces_deletedAt`, `Workspaces`.`OwnerId` AS `Workspaces_OwnerI
d` FROM `workspaces` `Workspaces` WHERE ( (`Workspaces`.`url` = ?) ) AND ( `Workspaces`.`deletedAt` IS NULL ) LIMIT 1 -- PARAMETERS: ["sleact"]
[Nest] 19948  - 2022. 08. 20. 오후 1:33:12   ERROR [ExceptionsHandler] Cannot read properties of null (reading 'id')
TypeError: Cannot read properties of null (reading 'id')
    at ChannelsService.createWorkspaceChannels (C:\Users\kwa13\IdeaProjects\sleact\back\dist\main.js:2034:41)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async C:\Users\kwa13\IdeaProjects\sleact\back\node_modules\@nestjs\core\router\router-execution-context.js:46:28
    at async C:\Users\kwa13\IdeaProjects\sleact\back\node_modules\@nestjs\core\router\router-proxy.js:9:17
[Nest] 19948  - 2022. 08. 20. 오후 1:33:12     LOG [HTTP] POST /api/workspaces/sleact/channels 500 52 - Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (K
HTML, like Gecko) Chrome/104.0.0.0 Safari/537.36 ::ffff:127.0.0.1

------------------------------------------------------------------------------------------------------------------------

DB 관련 스크린샷

- 채널

- 워크스페이스

-------------------------------------------------------------------------------------------

백엔드 관련 코드

- channels.controller.ts

@Controller('api/workspaces/:url/channels')
export class ChannelsController {
  constructor(private readonly channelsService: ChannelsService) {}

  @ApiOperation({ summary: '채널 생성하기' })
  @Post()
  async createChannel(
    @Param('url') url: string,
    @Body() body: CreateChannelDto,
    @User() user: Users,
  ) {
    return this.channelsService.createWorkspaceChannels(
      url,
      body.name,
      user.id,
    );
  }

- channels.service.ts

  async getWorkspaceChannels(url: string, myId: number) {
    return this.channelsRepository
      .createQueryBuilder('channels')
      .innerJoinAndSelect(
        'channels.ChannelMembers',
        'channelMembers',
        'channelMembers.userId = :myId',
        { myId },
      )
      .innerJoinAndSelect(
        'channels.Workspace',
        'workspace',
        'workspace.url = :url',
        { url },
      )
      .getMany();
  }

-----------------------------------------------------------------------------------------------------------------------

프론트엔드 관련 코드

- Workspace/index.tsx

const Workspace = () => {
  const [showUserMenu, setShowUserMenu] = useState(false);
  const [showCreateWorkspaceModal, setShowCreateWorkspaceModal] = useState(false);
  const [showWorkspaceModal, setShowWorkspaceModal] = useState(false);
  const [showCreateChannelModal, setShowCreateChannelModal] = useState(false);

  const [newWorkspace, onChangeNewWorkspace, setNewWorkspace] = useInput('');
  const [newUrl, onChangeNewUrl, setNewUrl] = useInput('');

  const { workspace } = useParams();

  const { data: userData, error, mutate } = useSWR<IUser | false>('/api/users', fetcher);
  const { data: channelData } = useSWR<IChannel[]>(userData ? `/api/workspaces/${workspace}/channels` : null, fetcher);

  const onLogout = useCallback(() => {
    axios
      .post('/api/users/logout', null, {
        withCredentials: true,
      })
      .then(() => {
        mutate();
      });
  }, []);

  const onClickUserProfile = useCallback(() => {
    setShowUserMenu((prev) => !prev);
  }, []);

  const onCloseUserProfile = useCallback((e: any) => {
    e.stopPropagation();
    setShowUserMenu(false);
  }, []);

  const onClickCreateWorkspace = useCallback(() => {
    setShowCreateWorkspaceModal(true);
  }, []);

  const onCloseModal = useCallback(() => {
    setShowCreateWorkspaceModal(false);
    setShowCreateChannelModal(false);
  }, []);

  const onCreateWorkspace = useCallback(
    (e: any) => {
      e.preventDefault();
      if (!newWorkspace || !newWorkspace.trim()) return;
      if (!newUrl || !newUrl.trim()) return;
      axios
        .post(
          '/api/workspaces',
          {
            name: newWorkspace,
            url: newUrl,
          },
          {
            withCredentials: true,
          },
        )
        .then(() => {
          mutate();
          setShowCreateWorkspaceModal(false);
          setNewWorkspace('');
          setNewUrl('');
        })
        .catch((error) => {
          console.dir(error);
          toast.error(error.response?.data, { position: 'bottom-center' });
        });
    },
    [newWorkspace, newUrl],
  );

  const toggleWorkspaceModal = useCallback(() => {
    setShowWorkspaceModal((prev) => !prev);
  }, []);

  const onClickAddChannel = useCallback(() => {
    setShowCreateChannelModal(true);
  }, []);

  if (!userData) {
    return <Navigate replace to="/login" />;
  }

  return (
    <div>
      <Header>
        <RightMenu>
          <span onClick={onClickUserProfile}>
            <ProfileImg src={gravatar.url(userData.email, { s: '28px', d: 'retro' })} alt={userData.nickname} />
            {showUserMenu && (
              <Menu style={{ right: 0, top: 38 }} show={showUserMenu} onCloseModal={onCloseUserProfile}>
                <ProfileModal>
                  <img src={gravatar.url(userData.email, { s: '36px', d: 'retro' })} alt={userData.nickname} />
                  <div>
                    <span id="profile-name">{userData.nickname}</span>
                    <span id="profile-active">Active</span>
                  </div>
                </ProfileModal>
                <LogOutButton onClick={onLogout}>로그아웃</LogOutButton>
              </Menu>
            )}
          </span>
        </RightMenu>
      </Header>
      <WorkspaceWrapper>
        <Workspaces>
          {userData?.Workspaces.map((ws) => {
            return (
              <Link key={ws.id} to={`/workspace/sleact/channel/일반`}>
                <WorkspaceButton>{ws.name.slice(0, 1).toUpperCase()}</WorkspaceButton>
              </Link>
            );
          })}
          <AddButton onClick={onClickCreateWorkspace}>+</AddButton>;
        </Workspaces>
        <Channels>
          <WorkspaceName onClick={toggleWorkspaceModal}>WorkspaceName</WorkspaceName>
          <MenuScroll>
            <Menu show={showWorkspaceModal} onCloseModal={toggleWorkspaceModal} style={{ top: 95, left: 80 }}>
              <WorkspaceModal>
                <h2>Sleact</h2>
                <button onClick={onClickAddChannel}>채널 만들기</button>
                <button onClick={onLogout}>로그아웃</button>
              </WorkspaceModal>
            </Menu>
            {channelData?.map((v) => (
              <div>{v.name}</div>
            ))}
          </MenuScroll>
        </Channels>
        <Chats>
          <Routes>
            <Route path="/channel/:channel" element={<Channel />} />
            <Route path="/dm/:id" element={<DM />} />
          </Routes>
        </Chats>
      </WorkspaceWrapper>
      <Modal show={showCreateWorkspaceModal} onCloseModal={onCloseModal}>
        <form onSubmit={onCreateWorkspace}>
          <Label id="workspace-label">
            <span>워크스페이스 이름</span>
            <Input id="workspace" value={newWorkspace} onChange={onChangeNewWorkspace} />
          </Label>

          <Label id="workspace-url-label">
            <span>워크스페이스 url</span>
            <Input id="workspace" value={newUrl} onChange={onChangeNewUrl} />
          </Label>
          <Button type="submit">생성하기</Button>
        </form>
      </Modal>

      <CreateChannelModal
        show={showCreateChannelModal}
        onCloseModal={onCloseModal}
        setShowCreateChannelModal={setShowCreateChannelModal}
      />
    </div>
  );
};

export default Workspace;

- CreateChannelModal/index.tsx

interface Props {
  show: boolean;
  onCloseModal: () => void;
  setShowCreateChannelModal: (flag: boolean) => void;
}

const CreateChannelModal: VFC<Props> = ({ show, onCloseModal, setShowCreateChannelModal }) => {
  const [newChannel, onChangeNewChannel, setNewChannel] = useInput('');
  const { workspace, channel } = useParams();

  const onCreateChannel = useCallback(
    (e: any) => {
      e.preventDefault();
      axios
        .post(
          `/api/workspaces/${workspace}/channels`,
          {
            name: newChannel,
          },
          { withCredentials: true },
        )
        .then(() => {
          setShowCreateChannelModal(false);
          setNewChannel('');
        })
        .catch((error) => {
          console.dir(error);
          toast.error(error.response?.data, { position: 'bottom-center' });
        });
    },
    [newChannel],
  );

  return (
    <Modal show={show} onCloseModal={onCloseModal}>
      <form onSubmit={onCreateChannel}>
        <Label id="channel-label">
          <span>채널</span>
          <Input id="channel" value={newChannel} onChange={onChangeNewChannel} />
        </Label>
        <Button type="submit">생성하기</Button>
      </form>
    </Modal>
  );
};

export default CreateChannelModal;

스스로 해결해보려고 많은 시간을 들여봤지만, 도저히 모르겠네요..

{showUserMenu && (

{userData.nickname} Active

로그아웃 )}

{userData?.Workspaces.map((ws) => { return ( {ws.name.slice(0, 1).toUpperCase()} ); })} +; WorkspaceName

Sleact

{channelData?.map((v) => (

{v.name}

))} } /> } />

); }; export default Workspace; - CreateChannelModal/index.tsx interface Props { show: boolean; onCloseModal: () => void; setShowCreateChannelModal: (flag: boolean) => void; } const CreateChannelModal: VFC = ({ show, onCloseModal, setShowCreateChannelModal }) => { const [newChannel, onChangeNewChannel, setNewChannel] = useInput(''); const { workspace, channel } = useParams(); const onCreateChannel = useCallback( (e: any) => { e.preventDefault(); axios .post( `/api/workspaces/${workspace}/channels`, { name: newChannel, }, { withCredentials: true }, ) .then(() => { setShowCreateChannelModal(false); setNewChannel(''); }) .catch((error) => { console.dir(error); toast.error(error.response?.data, { position: 'bottom-center' }); }); }, [newChannel], ); return ( ); }; export default CreateChannelModal; 스스로 해결해보려고 많은 시간을 들여봤지만, 도저히 모르겠네요..

Answer

ChannelsService.createWorkspaceChannels (C:\Users\kwa13\IdeaProjects\sleact\back\dist\main.js:2034:41
여기에 에러가 있다고 나와있는데 여기 확인해보셨나요?
x.id에서 x가 null이니 x가 뭔지 확인하셔야합니다.

ym Kim

채널 관련해서 2가지 에러가 발생했는데 원인을 못찾겠습니다..

이 글과 비슷한 Q&A

카카오 주소 검색 기능 401 에러

instantiator 질문

dispatch가 null인 경우 에러를 발생시키도록 하는 패턴을 실무에서도 사용할 수 있나요?

캐싱관련 질문있습니다.