sayanaS
tRPC•2y ago
sayana

useQuery first refetch returns undefined

Hello.
So, I'm trying to get an item by ID when the user clicks a button. I've searched around and found a way to do it by using 
useState()
 for the ID, setting 
useQuery
's 
enabled
 to 
false
, and 
refetch()
 whenever I need to get the item.

const [itemId, setItemId] = useState("");
const getItemById = api.items.getById.useQuery(
  { id: itemId },
  { enabled: false },
);

const getItemById = (id: string) => {
  setItemId(id);
  getItemById
    .refetch()
    .then((result) => {
      if (result.data) {
        console.log(result.data);
      }
    })
    .catch((err) => {
      // empty
    });
};

The problem is, the first 
refetch()
 always returns 
undefined
, so the user has to click the button twice to get the item.
I've looked around and the problem seems to be about re-rendering . There's a possible answer, but it uses 
onSuccess
 which will be deprecated soon.
https://stackoverflow.com/questions/75447288/reactquery-returns-undefined-as-the-first-result-then-returns-the-data
Is there a solution to this? Or perhaps a better way to get an item with ID as input on demand?
I'm using Node 18.
Stack Overflow
reactQuery returns undefined as the first result, then returns the ...
So, I'm trying to fetch data -onClick- using reactQuery and to store the response in a variable.
const { data: response, refetch } = useQuery({
queryKey: ['get-response'],
queryFn: async() ...
Solution
If you want to use the value imperatively you might want to use the vanilla client (via useUtils().client) or a mutation instead
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