itchy-amethyst

using return value of useQuery as a queryKey

export const useGetCurrentUser = () => {
  const { data } = useQuery({
    queryFn: () => query(),
    queryKey: ['current_user', 'user', data.id],
  });

  return { user: data as UserResponse };
};

export const useGetCurrentUser = () => {
  const { data } = useQuery({
    queryFn: () => query(),
    queryKey: ['current_user', 'user', data.id],
  });

  return { user: data as UserResponse };
};

This obviously does not work since data is used before its declaration. Is there a way to use data.id as a queryKey? I fetch the user by cookie information, so don't need to use an id, but want to use its id as a queryKey, so that if I fetch a user with useGetUserById function, which accepts an id, then I would hit the cache instead of making a request for the data I already have.

7 Replies

sensitive-blue•10mo ago

You can not self reference query data For current user just use current_user as a key, or me For users that you get by id you can get id from the query params

itchy-amethystOP•10mo ago

That's the current setup I have, but I was thinking if I can add the userId here on the current_user query, I would avoid making a request if I happen to fetch a user, which happens to be the current user, if that makes sense.

sensitive-blue•10mo ago

You can do it like this

export const useGetCurrentUser = () => {
  const queryClient = useQueryClient();

  const { data: user } = useQuery({
    queryFn: () => query(),
    queryKey: ['current_user'],
  });

  if(user?.id) {
    queryClient.setQueryData(['users', user.id], user);
  }

  return { user };
};

export const useGetUserById = (id?: number) => {
  const { data:user } = useQuery({
    queryFn: () => query(),
    queryKey: ['users', id],
    enabled: !!id
  });

  return { user };
};

export const useGetCurrentUser = () => {
  const queryClient = useQueryClient();

  const { data: user } = useQuery({
    queryFn: () => query(),
    queryKey: ['current_user'],
  });

  if(user?.id) {
    queryClient.setQueryData(['users', user.id], user);
  }

  return { user };
};

export const useGetUserById = (id?: number) => {
  const { data:user } = useQuery({
    queryFn: () => query(),
    queryKey: ['users', id],
    enabled: !!id
  });

  return { user };
};

It's overoptimization but here is how you can achieve this. You will have 2 records in the cache, one for a current user, and the second one for a user fetched by id. Technically speaking you should separate those, as those are 2 different concerns.

itchy-amethystOP•10mo ago

Oh, that makes sense. Thanks!

sensitive-blue•10mo ago

you're welcome 🙂

genetic-orange•10mo ago

Use a query Key factory, call the current user key factory with user ID from cookies.

genetic-orange•10mo ago

https://tkdodo.eu/blog/effective-react-query-keys

Effective React Query Keys

Learn how to structure React Query Keys effectively as your App grows

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Programming

using return value of useQuery as a queryKey

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