SansPapyrus683•6mo ago

is there a better way to do this?

  let query;
  let params;
  switch (getWhat) {
    case "posts":
      query = api.user.userPosts;
      params = { user: uid, what: "posts", cursor: at };
      break;
    case "likes":
      query = api.user.userPosts;
      params = { user: uid, what: "likes", cursor: at };
      break;
    case "following":
      query = api.user.followedPosts;
  }

  //@ts-ignore
  const { data, isPlaceholderData } = query.useQuery(params, {
    //@ts-ignore
    placeholderData: (prevRes) => prevRes ?? initPosts,
  });

  let query;
  let params;
  switch (getWhat) {
    case "posts":
      query = api.user.userPosts;
      params = { user: uid, what: "posts", cursor: at };
      break;
    case "likes":
      query = api.user.userPosts;
      params = { user: uid, what: "likes", cursor: at };
      break;
    case "following":
      query = api.user.followedPosts;
  }

  //@ts-ignore
  const { data, isPlaceholderData } = query.useQuery(params, {
    //@ts-ignore
    placeholderData: (prevRes) => prevRes ?? initPosts,
  });

so i have a component that renders a post list according to varying api calls however, this requires the two ts-ignore at the bottom. is there a way to tell ts that the two api calls result in the exact same type?

1 Reply

WeezyEzo•6mo ago

your implementation is against the laws of hooks. Hooks should not be called conditionally. Instead, you can make use of the enabled option of react query. I think this is the good way of doing what you want.

const { data: posts, isPlaceholderData: isPlaceholderPosts } = api.user.userPosts.useQuery({
  user: uid, what: getWhat as 'posts' | 'likes', cursor: at
}, {
  enabled: getWhat === 'posts' || getWhat === 'likes',
  placeholderData: (prevRes) => prevRest ?? initPosts
})

const { data: following, isPlaceholderData: isPlaceholderFollowing } = api.user.followedPosts.useQuery(undefined, {
  enabled: getWhat === 'following',
  placeholderData: (prevRes) => prevRest ?? initPosts
})

const { data: posts, isPlaceholderData: isPlaceholderPosts } = api.user.userPosts.useQuery({
  user: uid, what: getWhat as 'posts' | 'likes', cursor: at
}, {
  enabled: getWhat === 'posts' || getWhat === 'likes',
  placeholderData: (prevRes) => prevRest ?? initPosts
})

const { data: following, isPlaceholderData: isPlaceholderFollowing } = api.user.followedPosts.useQuery(undefined, {
  enabled: getWhat === 'following',
  placeholderData: (prevRes) => prevRest ?? initPosts
})

If you want to use only one variable for any of the data you can do this:

const data = posts || following
const isPlaceholderData = isPlaceholderPosts || isPlaceholderFollowing

const data = posts || following
const isPlaceholderData = isPlaceholderPosts || isPlaceholderFollowing

This issue is more of react-query related rather than trpc.