108 lines
3.0 KiB
Markdown
108 lines
3.0 KiB
Markdown
---
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id: useMutationState
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title: useMutationState
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---
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```ts
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function useMutationState<TResult, TMutation>(options, queryClient?): TResult[];
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```
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Defined in: [packages/preact-query/src/useMutationState.ts:157](https://github.com/TanStack/query/blob/main/packages/preact-query/src/useMutationState.ts#L157)
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`useMutationState` is a hook that gives you access to all mutations in the `MutationCache`. You can pass
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`filters` ([MutationFilters](../interfaces/MutationFilters.md)) to narrow down your mutations, and `select` to transform the mutation
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state.
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## Type Parameters
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### TResult
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`TResult` = [`MutationState`](../interfaces/MutationState.md)\<`unknown`, `Error`, `unknown`, `unknown`\>
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### TMutation
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`TMutation` *extends* [`Mutation`](../classes/Mutation.md)\<`any`, `any`, `any`, `any`\> = `MutationTypeFromResult`\<`TResult`\>
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## Parameters
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### options
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`MutationStateOptions`\<`TResult`, `TMutation`\> = `{}`
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The `filters` to narrow down matched mutations, and an optional `select` to transform the
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mutation state.
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### queryClient?
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[`QueryClient`](../classes/QueryClient.md)
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Use this to use a custom `QueryClient`. Otherwise, the one from the nearest context will
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be used.
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## Returns
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`TResult`[]
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Will be an Array of whatever `select` returns for each matching mutation.
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## Examples
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Get all variables of all running mutations:
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```tsx
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import { useMutationState } from '@tanstack/preact-query'
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function PendingPosts() {
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const pendingVariables = useMutationState({
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filters: { status: 'pending' },
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select: (mutation) => mutation.state.variables,
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})
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return <>{pendingVariables.length} posts saving...</>
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}
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```
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Get all data for specific mutations via the `mutationKey`:
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```tsx
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import { useMutation, useMutationState } from '@tanstack/preact-query'
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const mutationKey = ['posts']
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function Posts() {
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// Some mutation that we want to get the state for
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const mutation = useMutation({
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mutationKey,
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mutationFn: createPosts,
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})
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const savedPosts = useMutationState({
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// this mutation key needs to match the mutation key of the given mutation (see above)
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filters: { mutationKey, status: 'success' },
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select: (mutation) => mutation.state.data,
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})
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return (
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<button onClick={() => mutation.mutate(['New Post'])}>
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Create post ({savedPosts.length} saved so far)
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</button>
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)
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}
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```
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Access the latest successful mutation data via the `mutationKey`. Each invocation of `mutate` adds a new
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entry to the mutation cache for `gcTime` milliseconds — with the `status: 'success'` filter below, check the
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last item that `useMutationState` returns to get the latest successful invocation:
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```tsx
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import { useMutationState } from '@tanstack/preact-query'
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function LatestPost() {
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const savedPosts = useMutationState({
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filters: { mutationKey: ['posts'], status: 'success' },
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select: (mutation) => mutation.state.data,
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})
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const latestSavedPost = savedPosts[savedPosts.length - 1]
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return <>{latestSavedPost ? 'Saved' : 'Nothing saved yet'}</>
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}
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```
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