Theo's Typesafe Cult•17mo ago

How do I fetch from server side with useMutation?

Hello, I'm trying to do a server side fetch from the mutations that I made in the backend of my t3 app but I'm struggling to understand some things can someone help me please? I'm trying to pass the data from both the queries as props. What would be the most optimal approach to this? This is my code

export const getStaticProps: GetStaticProps = async ({ locale = "en" }) => {

  const sub = api.subscription.getUserPendingSubscriptions.useMutation().data;
  const history = api.changesHistory.getCurrentUserHistoryChanges.useMutation().data;

  return {
    props: {
      ...(await serverSideTranslations(locale)),
      sub,
      history
    },
  };
};

export default function Dashboard({ sub, history}) {
...

export const getStaticProps: GetStaticProps = async ({ locale = "en" }) => {

  const sub = api.subscription.getUserPendingSubscriptions.useMutation().data;
  const history = api.changesHistory.getCurrentUserHistoryChanges.useMutation().data;

  return {
    props: {
      ...(await serverSideTranslations(locale)),
      sub,
      history
    },
  };
};

export default function Dashboard({ sub, history}) {
...

11 Replies

Brendonovich•17mo ago

useMutation and useQuery should only be used inside your components. tRPC provides helpers for fetching data on the server: https://trpc.io/docs/client/nextjs/ssg

Static Site Generation | tRPC

Reference project//github.com/trpc/examples-next-prisma-todomvc

FervoreOP•17mo ago

can you point specifically what component/library/file should I be importing in order to re-use the mutations that I made on the api or am I forced to import prisma and re-do the queries inside getstaticprops?

Brendonovich•17mo ago

it's spelled out for you on that page - use createServerSideHelpers and prefetch in getStaticProps All your mutations and stuff stay the same, you're just using prefetch instead of useQuery Also from the looks of things you're using mutations to fetch data - don't do that getUserPendingSubscriptions and getUserPendingSubscriptions sound like things that should definitely be queries

FervoreOP•17mo ago

Ok so I did the create server side helpers object, it asked me to send context whith session and prisma and I did(I think so) but it still doesn't work, it's not recognizing the methods, what am I missing ?

import { useSession } from "next-auth/react";
import { prisma } from "sellit/server/db";
import { SessionContext, getSession } from "next-auth/react";

export const getStaticProps: GetStaticProps = async ({ locale = "en"}) => {
  const session = await getSession();
  const helpers = createServerSideHelpers({
    router: appRouter,
    ctx: {session, prisma},
  });
//Property 'getUserPendingSubscriptions' does not exist on type //'DecoratedProcedureSSGRecord<CreateRouterInner<RootConfig<...
  const sub = await helpers.subscription.getUserPendingSubscriptions.prefetch({});
//Property 'getCurrentUserHistoryChanges' does not exist on type //'DecoratedProcedureSSGRecord<CreateRouterInner<RootConfig<...
  const history = await helpers.changesHistory.getCurrentUserHistoryChanges.prefetch({});
  

  return {
    props: {
      ...(await serverSideTranslations(locale)),
      sub,
      history
    },
  };
};

import { useSession } from "next-auth/react";
import { prisma } from "sellit/server/db";
import { SessionContext, getSession } from "next-auth/react";

export const getStaticProps: GetStaticProps = async ({ locale = "en"}) => {
  const session = await getSession();
  const helpers = createServerSideHelpers({
    router: appRouter,
    ctx: {session, prisma},
  });
//Property 'getUserPendingSubscriptions' does not exist on type //'DecoratedProcedureSSGRecord<CreateRouterInner<RootConfig<...
  const sub = await helpers.subscription.getUserPendingSubscriptions.prefetch({});
//Property 'getCurrentUserHistoryChanges' does not exist on type //'DecoratedProcedureSSGRecord<CreateRouterInner<RootConfig<...
  const history = await helpers.changesHistory.getCurrentUserHistoryChanges.prefetch({});
  

  return {
    props: {
      ...(await serverSideTranslations(locale)),
      sub,
      history
    },
  };
};

Brendonovich•17mo ago

They aren't available as helpers will only contain queries, which those procedures should almost certainly be changed to

FervoreOP•17mo ago

I previously had them as queries but they would refresh my page everytime the window focused and I couldn't figure out how to remove that also so that's why they were made into mutations so there's no way to do it without changing them to queries?

Brendonovich•17mo ago

The correct move is to change them to queries and fix the refresh-on-focus behaviour at it's cause It's crucial to understand that useQuery and the like arent tRPC things, they're react query things, and react query's default behaviour is to refetch queries when the window is refocused

Brendonovich•17mo ago

You can disable window focus refetching at a per-query level or entirely: https://tanstack.com/query/v4/docs/react/guides/window-focus-refetching

Window Focus Refetching | TanStack Query Docs

If a user leaves your application and returns and the query data is stale, TanStack Query automatically requests fresh data for you in the background. You can disable this globally or per-query using the refetchOnWindowFocus option: Disabling Globally

FervoreOP•17mo ago

I'm guessing this is it? but how do I get the data from the page itself?

export const getServerSideProps: GetServerSideProps = async (context) => {
  const session = await getServerSession(context.req, context.res, authOptions);
  const helpers = createServerSideHelpers({
    router: appRouter,
    ctx: {session, prisma},
    transformer: superjson,
  });
  const sub = await helpers.subscription.getUserPendingSubscriptions.prefetch()
  const history = await helpers.changesHistory.getCurrentUserHistoryChanges.prefetch();

  return {
    props: {
      ...(await serverSideTranslations(context.locale)),
      trpcState: helpers.dehydrate(),
    },
  };
};

export default function Dashboard(props: InferGetServerSidePropsType<typeof getServerSideProps>,) {
  const { t } = useTranslation("common");

export const getServerSideProps: GetServerSideProps = async (context) => {
  const session = await getServerSession(context.req, context.res, authOptions);
  const helpers = createServerSideHelpers({
    router: appRouter,
    ctx: {session, prisma},
    transformer: superjson,
  });
  const sub = await helpers.subscription.getUserPendingSubscriptions.prefetch()
  const history = await helpers.changesHistory.getCurrentUserHistoryChanges.prefetch();

  return {
    props: {
      ...(await serverSideTranslations(context.locale)),
      trpcState: helpers.dehydrate(),
    },
  };
};

export default function Dashboard(props: InferGetServerSidePropsType<typeof getServerSideProps>,) {
  const { t } = useTranslation("common");

I get the data but it's undefined and it shouldn't be

Brendonovich•17mo ago

Just do a regular useQuery, the data should be automatically hydrated + inserted into the query Make sure you've wrapped your default export in pages/_app in withTRPC

FervoreOP•17mo ago

nice now it works, thanks a lot for the help. You're a hero.

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How do I fetch from server side with useMutation?