useQuery

Parameters

• document: GraphQL document containing the query. Can also be a Ref or a function that returns the document (which will be reactive).

• variables: (default: null) Variables object. Can also be a Ref, a reactive object or a function that returns the variables object.

• options: (default: null) Options object. Can also be a Ref, a reactive object or a function that returns the options object.

  • clientId: Id of the client that should be used for this query if you have provided multiple clients.

  • context: Context to be passed to link execution chain.

  • debounce: Debounce interval in ms.

  • enabled: A boolean Ref to enable or disable the query.

  • errorPolicy: Customize error behavior. See error handling.

    • none
    • all
    • ignore

  • fetchPolicy: Customize cache behavior.

    • cache-first (default): return result from cache. Only fetch from network if cached result is not available.
    • cache-and-network: return result from cache first (if it exists), then return network result once it's available.
    • cache-only: return result from cache if available, fail otherwise.
    • network-only: return result from network, fail if network call doesn't succeed, save to cache.
    • no-cache: return result from network, fail if network call doesn't succeed, don't save to cache.

  • metadata: Arbitrary metadata stored in the store with this query. Designed for debugging, developer tools, etc.

  • notifyOnNetworkStatusChange: Whether or not updates to the network status should trigger next on the observer of this query.

  • prefetch: (default: true) Enable prefetching on the server during Server-Side Rendering.

  • pollInterval: The time interval (in milliseconds) on which this query should be refetched from the server.

  • returnPartialData: Allow returning incomplete data from the cache when a larger query cannot be fully satisfied by the cache, instead of returning nothing.

  • throttle: Throttle interval in ms.

  • keepPreviousResult: (default: false) Whether or not to keep previous result when the query is fetch again (for example when a variable changes). This can be useful to prevent a flash of empty content.

Return

• result: result data object.

• loading: Boolean Ref, true if the query is in flight.

• error: Error Ref, holding any occuring error.

• variables: Ref holding the variables object.

• refetch(variables?): Execute the query again, optionally with new variables.

• fetchMore(options): Execute a variant of the query to retrieve additional data to be merged with the existing one. Useful for Pagination.

• subscribeToMore(options): Add a subscription to the query, useful to add new data received from the server in real-time. See Subscription.

• onResult(handler): Event hook called when a new result is available. Handler is called with: result (query result) and context which is an object with client (ApolloClient instance).

• onError(handler): Event hook called when an error occurs. Handler is called with: error and context which is an object with client (ApolloClient instance).