TanStackT
TanStack•2y ago
brilliant-lime

Mutation context in offline mode

Hi, does anyone know if it is possible to access a mutation context without it being resolved yet (offline mode).

I'm creating temporaries ids on my onMutate callbacks that i then put on my query context (offline mode) and i'd like to access it even though onSuccess / onError / onSetteled have being called as I'm offline.

This is how my mutatinon function looks like, it is made to handle offline mode
const mutation = useMutation({
        mutationFn: (inventory: Inventory) => createInventory(org_slug, inventory),
        onMutate: async (inventory: Inventory) => {
            //optimistic insert with temp_id
            const temp_id = await optimisticInsertList(queryClient, ['orgs', org_slug, 'inventories'], inventory)

            return { temp_id };
        },
        onSettled: () => {
            queryClient.invalidateQueries({ queryKey: ['orgs', org_slug, 'inventories'] });
        },
        onSuccess: async (data, variables, { temp_id }) => {
            // update state with new id
            await AsyncStorage.setItem(temp_id, data.id.toString());
            console.log('temp_id was set to', temp_id, 'and the new id is', data.id);
            optimisticUpdateList(queryClient, ['orgs', org_slug, 'inventories'], data, temp_id);
        },
        mutationKey: ['orgs', org_slug, 'inventories'],
    })


What I would like is to be abble to call mutation.mutate and get the temp_id.

Anyone has an idea of how this could be achieved ?
Thanks !
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