Hey, I have a small Problem with TanStackQuery. Th...

# javascript

[Hildebrandt Tobias]

Hey, I have a small Problem with TanStackQuery.
The options that expect functions don't work.

useQuery<Array<DocumentationElementDto>?, Error, Array<DocumentationElementDto>, QueryKey>(
    options = UseQueryOptions(
        queryKey = DOCUMENTATION_QUERY_KEY.plus(subCategory),
        queryFn = QueryFunction { 
            secureApi(DocumentationEndpoints
                .getDocumentationElement
                .copy(optionalQueryParams = pairListOf("category" to subCategory))
        )},
        refetchOnMount = { _ -> false },
        refetchOnWindowFocus = { _ -> false },
        refetchOnReconnect = { _ -> false },
        refetchInterval = 0,
        refetchIntervalInBackground = false,
    )
)

In this case

refetchOnMount = { _ -> false },
refetchOnWindowFocus = { _ -> false },
refetchOnReconnect = { _ -> false },

doesn't work, but these two:

refetchInterval = 0,
refetchIntervalInBackground = false,

behave as expected.
I also tried useCallback { _ -> false } , but it isn't accepted by the compiler.

[turansky]

// file constant
val NO_REFETCH = { _: Any? -> false } 


refetchOnMount = NO_REFETCH,
refetchOnWindowFocus = NO_REFETCH,
refetchOnReconnect = NO_REFETCH

?

[Hildebrandt Tobias]

I'll try that shortly, but I think I also tested that.

[turansky]

If it doesn't work - probably it's TanStack Query issue.

[Hildebrandt Tobias]

Hm, sadly it didn't work, when I switch tabs it executes the query again, and it's also not in the debug view:

[Hildebrandt Tobias]

Ok, turns out the very first thing { _ -> false} works. It just doesn't show up in the debugger.
Other fields had filled functions depicted with this: { }
I had two useQuery with the same key and I wrongly assumed that with these options the according
observer wouldn't update when the underlying QueryKey updates.
So one observer had the options and the other didn't, but the one that didn't still got the update pushed when the observer with refetch still enabled triggered the refetch.
Sorry, that behaviour was kind of unexpected for me.