默认查询函数

如果你出于任何原因想在整个应用程序中共享同一个查询函数，并仅使用查询键来标识它应该获取什么，你可以通过为 TanStack Query 提供一个 默认查询函数 来实现。

tsx

// Define a default query function that will receive the query key
const defaultQueryFn = async ({ queryKey }) => {
  const { data } = await axios.get(
    `https://jsonplaceholder.typicode.com${queryKey[0]}`,
  )
  return data
}

// provide the default query function to your app with defaultOptions
const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      queryFn: defaultQueryFn,
    },
  },
})

function App() {
  return (
    <QueryClientProvider client={queryClient}>
      <YourApp />
    </QueryClientProvider>
  )
}

// All you have to do now is pass a key!
function Posts() {
  const { status, data, error, isFetching } = useQuery(() => { queryKey: ['/posts'] })

  // ...
}

// You can even leave out the queryFn and just go straight into options
function Post({ postId }) {
  const { status, data, error, isFetching } = useQuery(() => {
    queryKey: [`/posts/${postId}`],
    enabled: !!postId,
  })

  // ...
}

// Define a default query function that will receive the query key
const defaultQueryFn = async ({ queryKey }) => {
  const { data } = await axios.get(
    `https://jsonplaceholder.typicode.com${queryKey[0]}`,
  )
  return data
}

// provide the default query function to your app with defaultOptions
const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      queryFn: defaultQueryFn,
    },
  },
})

function App() {
  return (
    <QueryClientProvider client={queryClient}>
      <YourApp />
    </QueryClientProvider>
  )
}

// All you have to do now is pass a key!
function Posts() {
  const { status, data, error, isFetching } = useQuery(() => { queryKey: ['/posts'] })

  // ...
}

// You can even leave out the queryFn and just go straight into options
function Post({ postId }) {
  const { status, data, error, isFetching } = useQuery(() => {
    queryKey: [`/posts/${postId}`],
    enabled: !!postId,
  })

  // ...
}

如果您想覆盖默认的 queryFn，您只需像往常一样提供自己的查询函数即可。

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