# useInfiniteQuery()

> 

> [!WARNING] Deprecated
> The classic React Query integration (`@trpc/react-query`) only gets bug fixes, and will be removed in the next major version of tRPC. New projects should use the [TanStack React Query integration](https://trpc.io/docs/client/tanstack-react-query.md) (`@trpc/tanstack-react-query`). To move an existing project, follow the [migration guide](https://trpc.io/docs/client/tanstack-react-query/migrating.md).


> [!NOTE] Info
>
> - Your procedure needs to accept a `cursor` input of any type (`string`, `number`, etc) to expose this hook.
> - For more details on infinite queries read the [react-query docs](https://tanstack.com/query/v5/docs/framework/react/reference/useInfiniteQuery)
> - In this example we're using Prisma - see their docs on [cursor-based pagination](https://www.prisma.io/docs/concepts/components/prisma-client/pagination#cursor-based-pagination)


## Example Procedure

```tsx title="server/routers/_app.ts"
import { initTRPC } from '@trpc/server';
import { z } from 'zod';

export const t = initTRPC.create();

export const appRouter = t.router({
  infinitePosts: t.procedure
    .input(
      z.object({
        limit: z.number().min(1).max(100).nullish(),
        cursor: z.number().nullish(), // <-- "cursor" needs to exist, but can be any type
        direction: z.enum(['forward', 'backward']), // optional, useful for bi-directional query
      }),
    )
    .query(async (opts) => {
      const { input } = opts;
      const limit = input.limit ?? 50;
      const { cursor } = input;
      const items = await prisma.post.findMany({
        take: limit + 1, // get an extra item at the end which we'll use as next cursor
        where: {
          title: {
            contains: 'Prisma' /* Optional filter */,
          },
        },
        cursor: cursor ? { myCursor: cursor } : undefined,
        orderBy: {
          myCursor: 'asc',
        },
      });
      let nextCursor: typeof cursor | undefined = undefined;
      if (items.length > limit) {
        const nextItem = items.pop();
        nextCursor = nextItem!.myCursor;
      }

      return {
        items,
        nextCursor,
      };
    }),
});
```

## Example React Component

```tsx title="components/MyComponent.tsx"
import { trpc } from '../utils/trpc';

export function MyComponent() {
  const myQuery = trpc.infinitePosts.useInfiniteQuery(
    {
      limit: 10,
    },
    {
      getNextPageParam: (lastPage) => lastPage.nextCursor,
      // initialCursor: 1, // <-- optional you can pass an initialCursor
    },
  );
  // [...]
}
```

## Helpers

### `getInfiniteData()`

This helper gets the currently cached data from an existing infinite query

```tsx title="components/MyComponent.tsx"
import { trpc } from '../utils/trpc';

export function MyComponent() {
  const utils = trpc.useUtils();

  const myMutation = trpc.infinitePosts.add.useMutation({
    async onMutate(opts) {
      await utils.infinitePosts.list.cancel();
      const allPosts = utils.infinitePosts.list.getInfiniteData({ limit: 10 });
      // [...]
    },
  });
}
```

### `setInfiniteData()`

This helper allows you to update a query's cached data

```tsx title="components/MyComponent.tsx"
import { trpc } from '../utils/trpc';

export function MyComponent() {
  const utils = trpc.useUtils();

  const myMutation = trpc.infinitePosts.delete.useMutation({
    async onMutate(opts) {
      await utils.infinitePosts.list.cancel();

      utils.infinitePosts.list.setInfiniteData({ limit: 10 }, (data) => {
        if (!data) {
          return {
            pages: [],
            pageParams: [],
          };
        }

        return {
          ...data,
          pages: data.pages.map((page) => ({
            ...page,
            items: page.items.filter((item) => item.status === 'published'),
          })),
        };
      });
    },
  });

  // [...]
}
```