useInfiniteQuery()

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信息

• 你的过程需要接受任意类型的 cursor 输入（string、number 等）才能使用此钩子
• 有关无限查询的更多细节，请阅读 react-query 文档
• 本示例使用 Prisma - 参考其 基于游标的分页文档

示例过程

server/routers/_app.ts
tsx
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,
      };
    }),
});

server/routers/_app.ts
tsx
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,
      };
    }),
});

示例 React 组件

components/MyComponent.tsx
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
    },
  );
  // [...]
}

components/MyComponent.tsx
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
    },
  );
  // [...]
}

辅助函数

getInfiniteData()

该辅助函数从现有无限查询中获取当前缓存的数据

components/MyComponent.tsx
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 });
      // [...]
    },
  });
}

components/MyComponent.tsx
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()

此辅助工具允许更新查询的缓存数据

components/MyComponent.tsx
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'),
          })),
        };
      });
    },
  });
 
  // [...]
}

components/MyComponent.tsx
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'),
          })),
        };
      });
    },
  });
 
  // [...]
}