TanStackT
TanStack•4mo ago•
2 replies
military-pink

How to wait for 'clean' queryCollection

This is related to this scenario here: https://discord.com/channels/719702312431386674/1369767025723052134/1423904416272089089.

I'm creating a row if it does not already exist. If it does exist, the API will return an error, and the desired behaviour is that it refetches to sync with the query state. However, at this point the change gets reverted, triggering the same mutation to run again.

I'm wondering if there's a way to wait for the collection to be 'clean': that is that there was a refetch and no errors occured since.

Here's some code for context:
useEffect(() => {

        // It's important for this logic to be idempotent since React will call this twice
        querySubjects.forEach(async (querySubject) => {
          const matchingSubject = subjectsCollection.get(querySubject.id);
          if (!matchingSubject && subjectsCollection.isReady()) {
            try {
              subjectsCollection
                .insert({
                  name: displayLongOrShort(querySubject.name),
                  subject_id: querySubject.id,
                  hue: Math.floor(Math.random() * 360),
                })
                .isPersisted.promise.catch();
            } catch (error) {
              /* Blanket catch in case the sync happens and there was already such a row */
            }
          }
        });
      }, [querySubjects, subjectsCollection]);

To give some more context, the querySubjects comes from a tanstack query on a different API I don't control.
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