In what situations the `data` content gets reset?

[manic tinsel]

I'm trying to use Query to handle an analytics dashboard. The query key is made of the url plus query params, the latter contains a start and end property. Every 30 seconds the time filter gets updated to use the latest timestamp.

What happens is that React Query re-triggers the isPending because, after some debugging, I found out that at every call the content of data goes undefined even though there was some stuff before. I've tried to check for some unwanted rerender but everything looks fine.

In your experience, when does the data content gets reset?

[spring hamlet]

I guess the start and end property are part of the queryKey (as they should), so you'll get a new cache entry, where you have no data yet, hence the pending state.

have a look at placeholderData (in v5): https://tanstack.com/query/latest/docs/react/guides/paginated-queries#better-paginated-queries-with-placeholderdata

[manic tinsel]

Ok so if I understand it correctly there is a data content for each different queryKey? Thanks a lot, the example you linked solved the issue.