createMutation

const createMutation: <TData, TError, TVariables, TOnMutateResult>(options: UseMutationOptions<TData, TError, TVariables, TOnMutateResult>, queryClient?: Accessor<QueryClient>) => UseMutationResult<TData, TError, TVariables, TOnMutateResult> = useMutation;

const createMutation: <TData, TError, TVariables, TOnMutateResult>(options: UseMutationOptions<TData, TError, TVariables, TOnMutateResult>, queryClient?: Accessor<QueryClient>) => UseMutationResult<TData, TError, TVariables, TOnMutateResult> = useMutation;

Defined in: packages/solid-query/src/index.ts:80

Unlike queries, mutations are typically used to create/update/delete data or perform server side-effects. useMutation is the primitive for that.

Type Parameters

Parameters

options

UseMutationOptions<TData, TError, TVariables, TOnMutateResult>

An accessor returning the UseMutationOptions to use.

queryClient?

Accessor<QueryClient>

An accessor for a custom QueryClient. Otherwise, the one from the nearest context will be used.

Returns

UseMutationResult<TData, TError, TVariables, TOnMutateResult>

mutate/mutateAsync also accept per-call onSuccess/onError/onSettled callbacks as a second argument, useful for triggering call-site side effects (e.g. navigation) without coupling them to the shared mutation definition. Hook-level callbacks (passed to options) fire for every mutation; per-call callbacks fire only for the latest call you've made, and only while the component is still mounted — unmounting before the mutation settles removes the subscription and prevents them from firing.

Examples

tsx

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function TodoItem(props: { id: number }) {
  const queryClient = useQueryClient()

  const deleteTodoMutation = useMutation(() => ({
    mutationFn: deleteTodo,
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['todos'] })
    },
  }))

  return (
    <button onClick={() => deleteTodoMutation.mutate({ id: props.id })} disabled={deleteTodoMutation.isPending}>
      Delete
    </button>
  )
}

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function TodoItem(props: { id: number }) {
  const queryClient = useQueryClient()

  const deleteTodoMutation = useMutation(() => ({
    mutationFn: deleteTodo,
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['todos'] })
    },
  }))

  return (
    <button onClick={() => deleteTodoMutation.mutate({ id: props.id })} disabled={deleteTodoMutation.isPending}>
      Delete
    </button>
  )
}

Rendering the mutation's own state, rather than just firing it off:

tsx

import { Match, Switch } from 'solid-js'
import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodo() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),
  }))

  return (
    <Switch fallback={<button onClick={() => addMutation.mutate('Item')}>Add</button>}>
      <Match when={addMutation.isPending}>Adding todo...</Match>
      <Match when={addMutation.isError}>
        <div>An error occurred: {addMutation.error?.message}</div>
        <button onClick={() => addMutation.mutate('Item')}>Add</button>
      </Match>
    </Switch>
  )
}

import { Match, Switch } from 'solid-js'
import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodo() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),
  }))

  return (
    <Switch fallback={<button onClick={() => addMutation.mutate('Item')}>Add</button>}>
      <Match when={addMutation.isPending}>Adding todo...</Match>
      <Match when={addMutation.isError}>
        <div>An error occurred: {addMutation.error?.message}</div>
        <button onClick={() => addMutation.mutate('Item')}>Add</button>
      </Match>
    </Switch>
  )
}

Optimistic update via onMutate, rolling back on onError:

tsx

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodo() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onMutate: async (newTodo) => {
      await queryClient.cancelQueries({ queryKey: ['todos'] })
      const previousTodos = queryClient.getQueryData<Array<string>>(['todos'])

      queryClient.setQueryData<Array<string>>(['todos'], (old) => [
        ...(old ?? []),
        newTodo,
      ])

      // Passed to `onError` as `onMutateResult` if the mutation fails.
      return { previousTodos }
    },
    onError: (_err, _newTodo, onMutateResult) => {
      queryClient.setQueryData(['todos'], onMutateResult?.previousTodos)
    },
    onSettled: () => {
      queryClient.invalidateQueries({ queryKey: ['todos'] })
    },
  }))

  return (
    <button onClick={() => addMutation.mutate('Item')}>Add</button>
  )
}

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodo() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onMutate: async (newTodo) => {
      await queryClient.cancelQueries({ queryKey: ['todos'] })
      const previousTodos = queryClient.getQueryData<Array<string>>(['todos'])

      queryClient.setQueryData<Array<string>>(['todos'], (old) => [
        ...(old ?? []),
        newTodo,
      ])

      // Passed to `onError` as `onMutateResult` if the mutation fails.
      return { previousTodos }
    },
    onError: (_err, _newTodo, onMutateResult) => {
      queryClient.setQueryData(['todos'], onMutateResult?.previousTodos)
    },
    onSettled: () => {
      queryClient.invalidateQueries({ queryKey: ['todos'] })
    },
  }))

  return (
    <button onClick={() => addMutation.mutate('Item')}>Add</button>
  )
}

Callbacks passed per call to mutate only fire for the last call — mutateAsync gives you a promise per call instead, so you can wait for all of them when they succeed:

tsx

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodos() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),
  }))

  async function handleAddAll(todos: Array<string>) {
    try {
      await Promise.all(todos.map((todo) => addMutation.mutateAsync(todo)))
    } catch (error) {
      console.error('Failed to add todos:', error)
    }
  }

  return (
    <button onClick={() => handleAddAll(['Todo 1', 'Todo 2', 'Todo 3'])}>
      Add all
    </button>
  )
}

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodos() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),
  }))

  async function handleAddAll(todos: Array<string>) {
    try {
      await Promise.all(todos.map((todo) => addMutation.mutateAsync(todo)))
    } catch (error) {
      console.error('Failed to add todos:', error)
    }
  }

  return (
    <button onClick={() => handleAddAll(['Todo 1', 'Todo 2', 'Todo 3'])}>
      Add all
    </button>
  )
}

If some of the mutations above can fail independently of the others, and you want to know which ones did — rather than losing that information the moment the first one rejects — swap Promise.all for Promise.allSettled:

tsx

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodos() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),
  }))

  async function handleAddAll(todos: Array<string>) {
    const addResults = await Promise.allSettled(
      todos.map((todo) => addMutation.mutateAsync(todo)),
    )

    addResults.forEach((addResult, index) => {
      if (addResult.status === 'rejected') {
        console.error(`Failed to add "${todos[index]}":`, addResult.reason)
      }
    })
  }

  return (
    <button onClick={() => handleAddAll(['Todo 1', 'Todo 2', 'Todo 3'])}>
      Add all
    </button>
  )
}

import { useMutation, useQueryClient } from '@tanstack/solid-query'

function AddTodos() {
  const queryClient = useQueryClient()

  const addMutation = useMutation(() => ({
    mutationFn: addTodo,
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),
  }))

  async function handleAddAll(todos: Array<string>) {
    const addResults = await Promise.allSettled(
      todos.map((todo) => addMutation.mutateAsync(todo)),
    )

    addResults.forEach((addResult, index) => {
      if (addResult.status === 'rejected') {
        console.error(`Failed to add "${todos[index]}":`, addResult.reason)
      }
    })
  }

  return (
    <button onClick={() => handleAddAll(['Todo 1', 'Todo 2', 'Todo 3'])}>
      Add all
    </button>
  )
}

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