usePreloadedQuery.md

id	title
use-preloaded-query	usePreloadedQuery

sample project with nextjs and SSR

loadQuery

• input parameters

same as useQuery + environment

• output parameters
  • next: ( environment: IEnvironment, gqlQuery: GraphQLTaggedNode, variables?: TOperationType['variables'], options?: QueryOptions, ) => Promise<void>: fetches data. A promise returns to allow the await in case of SSR
  • dispose: () => void: cancel the subscription and dispose of the fetch
  • subscribe: (callback: (value: any) => any) => () => void: used by the usePreloadedQuery
  • getValue: (environment?: IEnvironment) => RenderProps<TOperationType> | Promise<any>: used by the usePreloadedQuery

import {graphql, loadQuery} from 'relay-hooks';
import {environment} from ''./environment';

const query = graphql`
  query AppQuery($id: ID!) {
    user(id: $id) {
      name
    }
  }
`;

const prefetch = loadQuery();
prefetch.next(
  environment,
  query,
  {id: '4'},
  {fetchPolicy: 'store-or-network'},
);
// pass prefetch to usePreloadedQuery()

loadLazyQuery

is the same as loadQuery but must be used with suspense

usePreloadedQuery

• input parameters

  • loadQuery | loadLazyQuery

• output parameters

  • same as useQuery

function Component(props) {
  data = usePreloadedQuery(props.prefetched);
  return data;
}