T

TanStack•3y ago•

21 replies

exclusive-coral

setQueryData and structuralSharing

Hey! I have a question about structural sharing behavior when calling setQueryDatasetQueryData manually.
I have a query which I want to be updated only manually by setQueryDatasetQueryData, so I set staleTimestaleTime and cacheTimecacheTime to InfinityInfinity.
I also set structuralSharingstructuralSharing to

false

false

, so my component always react to

data

data

changes after manual setQueryDatasetQueryData call, even if updated data is exactly the same as previous one.

The thing is that it doesn't. If new data is new object (made by spread operator), but is deeply equal to old data,

data

data

property returned from this query still has the same reference and it doesn't trigger useEffect(..., [data])useEffect(..., [data]).
I also tried to use structuralSharingstructuralSharing as the function, so I check if it's called properly. But it never gets called.
However, if I change any property inside my data when calling setQueryDatasetQueryData,

data

data

from query has new reference and all works as expected.

I really would like to understand how setQueryDatasetQueryData and structuralSharingstructuralSharing works together under the hood. I have pretty big object under this query key and I would like to make sure then structural sharing is really disabled and replaceEqualDeepreplaceEqualDeep never gets called for this query.

And btw thanks for this incredible library