v28•2mo ago

Correct way to fetch trpc data on SSR and CSR

Hello, I am currently using trpc in my nextjs app router project and I am wondering what the best way of using trpc is with a mixture of SSR and CSR. The issue I'm having is that because I'm fetching the data on the server, it also fetches on the client which menas I'm making a request needlessly, and I'm not sure what the best way of dealing with this is. I have a page which is SSR rendered, so I fetch the data which will be used by the page:

"use server"

export default async function Applications({ params }: Props) {
  const { guildId } = await params;
  const applications = await api.application.getAll({ guildId });

  return (
    <HydrateClient>
      <h1>Applications {guildId}</h1>
      <Test applications={applications} />
    </HydrateClient>
  );
}

"use server"

export default async function Applications({ params }: Props) {
  const { guildId } = await params;
  const applications = await api.application.getAll({ guildId });

  return (
    <HydrateClient>
      <h1>Applications {guildId}</h1>
      <Test applications={applications} />
    </HydrateClient>
  );
}

"use client"

export const Test = ({ applications, guildId }: TestProps) => {
  const { data, refetch } = api.application.getAll.useQuery(
    {
      guildId: guildId,
    }
  );
  const [apps, setApps] = useState(applications);

  useEffect(() => {
    if (data) {
      setApps(data);
    }
  }, [data, applications]);

  return (
    <div>
      <h1>Test</h1>
      {apps.map((application) => (
        <div key={application.id}>{application.name}</div>
      ))}
      <Button
        onClick={async () => {
          await refetch();
        }}
      >
        refetch
      </Button>
    </div>
  );
};

"use client"

export const Test = ({ applications, guildId }: TestProps) => {
  const { data, refetch } = api.application.getAll.useQuery(
    {
      guildId: guildId,
    }
  );
  const [apps, setApps] = useState(applications);

  useEffect(() => {
    if (data) {
      setApps(data);
    }
  }, [data, applications]);

  return (
    <div>
      <h1>Test</h1>
      {apps.map((application) => (
        <div key={application.id}>{application.name}</div>
      ))}
      <Button
        onClick={async () => {
          await refetch();
        }}
      >
        refetch
      </Button>
    </div>
  );
};

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