Question about useQuery definition
Hello,
Can someone explain to me what "The last successfully resolved data for the query" means? I read it on the docs about
useQuery data property: https://tanstack.com/query/v4/docs/framework/react/reference/useQuery#:~:text=The%20last%20successfully%20resolved%20data%20for%20the%20query.useQuery | TanStack Query React Docs
const {
data,
4 Replies
optimistic-gold•15mo ago
Do you have a more specific question? Are you asking for an example of a time that the last request would have an error, so the phrase "successfully resolved" part matters?
inland-turquoiseOP•15mo ago
For example, if I call my custom hook that calls
useQuery that is related to myKey queryKey on screen A and then I call the same custom hook on screen B and need to use the values that data returns, it means that data will store the data already stored when I called the custom hook on screen A?optimistic-gold•15mo ago
I think you're asking if mounting a new component on screen B that subscribes to the same query key will cause the query to be refetched if the query key was already subscribed to on screen A by another useQuery? Am I understanding right?
By default the mounting of a new component that uses (your custom hook that calls) useQuery for the same query key wil result in that data being fetched again. Whether this data is refetched depends on
staleTime, but if you don't set it then the default is zero and every time a new useQuery() for the same query key mounts a new request will be sent. Once that request finishes successfully, every location where that query key is used will be updated.inland-turquoiseOP•15mo ago
I understand, thanks
And in this example: on screen A I call my custom hook that calls
useQuery associated with myKey queryKey and on screen B I set a variable const myData = queryClient.getQueryData(myKey). That means that myData will store the data fetched on screen A?