useMutation

Example

import {useMutation} from 'blitz'
import updateProject from 'app/projects/mutations/updateProject'

function (props) {
  const [updateProjectMutation] = useMutation(updateProject)

  return (
    <Formik
      onSubmit={async values => {
        try {
          const project = await updateProjectMutation(values)
        } catch (error) {
          alert('Error saving project')
        }
      }}>
      {/* ... */}
    </Formik>
  )
}

For more examples and use cases, see the mutation usage documentation.

API

const [
  invoke,
  {
    data,
    error,
    isError,
    isIdle,
    isLoading,
    isPaused,
    isSuccess,
    mutate,
    reset,
    status,
  },
] = useMutation(mutationResolver, {
  mutationKey,
  onError,
  onMutate,
  onSettled,
  onSuccess,
  useErrorBoundary,
})

const promise = invoke(inputArguments, {
  onError,
  onSettled,
  onSuccess,
})

Arguments

• mutationResolver: A Blitz mutation resolver
  • Required
• options
  • Optional

Options

• mutationKey: string
  • Optional
  • A mutation key can be set to inherit defaults set with queryClient.setMutationDefaults or to identify the mutation in the devtools.
• onMutate: (variables: TVariables) => Promise<TContext | void> | TContext | void
  • Optional
  • This function will fire before the mutation function is fired and is passed the same variables the mutation function would receive
  • Useful to perform optimistic updates to a resource in hopes that the mutation succeeds
  • The value returned from this function will be passed to both the onError and onSettled functions in the event of a mutation failure and can be useful for rolling back optimistic updates.
• onSuccess: (data: TData, variables: TVariables, context?: TContext) => Promise<void> | void
  • Optional
  • This function will fire when the mutation is successful and will be passed the mutation's result.
  • If a promise is returned, it will be awaited and resolved before proceeding
• onError: (err: TError, variables: TVariables, context?: TContext) => Promise<void> | void
  • Optional
  • This function will fire if the mutation encounters an error and will be passed the error.
  • If a promise is returned, it will be awaited and resolved before proceeding
• onSettled: (data: TData, error: TError, variables: TVariables, context?: TContext) => Promise<void> | void
  • Optional
  • This function will fire when the mutation is either successfully fetched or encounters an error and be passed either the data or error
  • If a promise is returned, it will be awaited and resolved before proceeding
• retry: boolean | number | (failureCount: number, error: TError) => boolean
  • If false, failed mutations will not retry by default.
  • If true, failed mutations will retry infinitely.
  • If set to an number, e.g. 3, failed mutations will retry until the failed mutations count meets that number.
• retryDelay: number | (retryAttempt: number, error: TError) => number
  • This function receives a retryAttempt integer and the actual Error and returns the delay to apply before the next attempt in milliseconds.
  • A function like attempt => Math.min(attempt > 1 ? 2 ** attempt * 1000 : 1000, 30 * 1000) applies exponential backoff.
  • A function like attempt => attempt * 1000 applies linear backoff.
• useErrorBoundary: boolean
  • Optional
  • Defaults to the global query config's useErrorBoundary value, which is false
  • Set this to true if you want mutation errors to be thrown in the render phase and propagate to the nearest error boundary

Returns

[mutate, mutationExtras]

mutate: (variables: TVariables, { onSuccess, onSettled, onError }) => Promise<TData>

• The mutation function you can call with variables to trigger the mutation and optionally override options passed to useMutation.
• variables: TVariables
  • Optional
  • The variables object to pass to the mutationFn.
• Remaining options extend the same options described above in the useMutation hook.
• If you make multiple requests, onSuccess will fire only after the latest call you've made.

mutationExtras: Object

• status: string
  • Will be:
    • idle initial status prior to the mutation function executing.
    • loading if the mutation is currently executing.
    • error if the last mutation attempt resulted in an error.
    • success if the last mutation attempt was successful.
• isIdle, isLoading, isSuccess, isError: boolean variables derived from status
• data: undefined | unknown
  • Defaults to undefined
  • The last successfully resolved data for the query.
• error: null | TError
  • The error object for the query, if an error was encountered.
• reset: () => void
  • A function to clean the mutation internal state (i.e., it resets the mutation to its initial state).