Will it fetch multiple time in this example ?

I have an endpoint that sends me a big object (ex: all posts + all messages). I'd like to fetch only once and compute only once derivated data.
I'm thinking of creating multiple hooks:

const useAllPostsAndCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll
)

const useAllPostIdsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.map(p => p.id))}
)

const useAllCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.flatMap(p => p.comment)}
)

const useAllPostsAndCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll
)

const useAllPostIdsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.map(p => p.id))}
)

const useAllCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.flatMap(p => p.comment)}
)

Will it fetch multiple time or recompute the select function multiple times ?

TanStack•4y ago•

7 replies

living-lavender

Will it fetch multiple time in this example ?

I have an endpoint that sends me a big object (ex: all posts + all messages). I'd like to fetch only once and compute only once derivated data.
I'm thinking of creating multiple hooks:

const useAllPostsAndCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll
)

const useAllPostIdsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.map(p => p.id))}
)

const useAllCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.flatMap(p => p.comment)}
)

const useAllPostsAndCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll
)

const useAllPostIdsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.map(p => p.id))}
)

const useAllCommentsQuery = () => useQuery(
  ["posts"],
  fetchAll,
  {select: posts => posts.flatMap(p => p.comment)}
)

Will it fetch multiple time or recompute the select function multiple times ?

Will it fetch multiple time in this example ?

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