like-gold

useMutation onSuccess trying to add new row of data to UI, not working

I am a newbie with this library. Attempting to implement my first useMutation. Everything is working correctly on the backend. Now on the front, I want to reflect the new ingredient that was just added in the table. I read on their site that the usual practice is passing back the newly added entry after adding something, so no extra network calls needed. I am passing the new ingredient back and I can see it in the data. But the ingredients table is not updating. I don't understand react-query enough to understand what variables is or where it is coming from. But I'm thinking one issue or maybe the issue is that the id in variables is blank. Here is my useMutation code:

const { mutateAsync: insertIngredientMutation, isLoading } = useMutation({
    mutationFn: insertIngredient,
    onSuccess: (data, variables) => {
        console.log({ data, variables });
        queryClient.setQueryData(
            ['ingredients', { id: variables.id }],
            data
        );
    }
});

const { mutateAsync: insertIngredientMutation, isLoading } = useMutation({
    mutationFn: insertIngredient,
    onSuccess: (data, variables) => {
        console.log({ data, variables });
        queryClient.setQueryData(
            ['ingredients', { id: variables.id }],
            data
        );
    }
});

11 Replies

like-goldOP•2y ago

This is the page from tanstack that I was following: https://tanstack.com/query/latest/docs/react/guides/updates-from-mutation-responses

Updates from Mutation Responses | TanStack Query Docs

When dealing with mutations that update objects on the server, it's common for the new object to be automatically returned in the response of the mutation. Instead of refetching any queries for that item and wasting a network call for data we already have, we can take advantage of the object returned by the mutation function and update the exis...

conscious-sapphire•2y ago

Pretty sure variables is what you call mutateAysnc(...) with and in that case if you're inserting you probably don't have an id. That id should come from your data result

like-goldOP•2y ago

Oh, so here is where I'm calling the mutateAsync: insertIngredientMutation(editingIngredient).then((r) => console.log(r)); so editingIngredient should have an id?

conscious-sapphire•2y ago

editing would, yeah. But your original code snippet was insertIngredientMutation

like-goldOP•2y ago

I'm renaming that function

conscious-sapphire•2y ago

If you have an id being passed into the mutation then that should work assuming your queryKeys match

like-goldOP•2y ago

aw yep, id is blank in that object too Seems hacky to do this code and on the front end:

const addIngredient = () => {
    setAddingIngredient(true);
    console.log({ ingIDs: ingredients.map((i) => i.id) });
    const ingIDs = ingredients.map((i) => i.id);
    const largestID = Math.max(...ingIDs);
    const nextID = largestID +1;
        ...

const addIngredient = () => {
    setAddingIngredient(true);
    console.log({ ingIDs: ingredients.map((i) => i.id) });
    const ingIDs = ingredients.map((i) => i.id);
    const largestID = Math.max(...ingIDs);
    const nextID = largestID +1;
        ...

I feel like I should be able to add a new ingredient without figuring out the id ahead of time? Am I going about it wrong?

conscious-sapphire•2y ago

Yeah you shouldn't determine the id that's for your server/database to handle

like-goldOP•2y ago

yeah, thats what I was thinking so then how do I get that variables object to have a filled in id?

conscious-sapphire•2y ago

That's really not a react-query question tbh. If you're editing your data should contain ids, if you're inserting your API result should provide that id. If you want to use one mutation for both you could do something like queryClient.setQueryData(['todo', { id: data.id ?? variables.id }], data)

like-goldOP•2y ago

what do you mean for both? I'm only doing one mutation. wondering if I have to do something like this?

queryClient.setQueryData(
    ['ingredients', { id: data.id ?? variables.id }],
        (oldData) => [...oldData, data]);

queryClient.setQueryData(
    ['ingredients', { id: data.id ?? variables.id }],
        (oldData) => [...oldData, data]);

I did verify that this code does do what I want:

onSuccess: (data, variables) => {
    console.log({ data, variables });
    queryClient.invalidateQueries(['ingredients']);

onSuccess: (data, variables) => {
    console.log({ data, variables });
    queryClient.invalidateQueries(['ingredients']);

I guess its my fallback if I can't get the setQueryData to work Finally got it to work with this code:

onSuccess: (data) => {
    queryClient.setQueryData(['ingredients'], (prevData: any) => [
        ...prevData,
        data[0]
    ]);
}

onSuccess: (data) => {
    queryClient.setQueryData(['ingredients'], (prevData: any) => [
        ...prevData,
        data[0]
    ]);
}

Thanks for your help!

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useMutation onSuccess trying to add new row of data to UI, not working

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