fetch method

Future<void> fetch({ required Future<T> fetcher(TPageParam?), required TPageParam? getNextPageParam(T lastPage, List<T> allPages), })

Fetches the initial page of data.

Implementation

Future<void> fetch({
  required Future<T> Function(TPageParam?) fetcher,
  required TPageParam? Function(T lastPage, List<T> allPages)
      getNextPageParam,
}) async {
  _fetcher = fetcher;
  _getNextPageParam = getNextPageParam;

  if (_pages.isNotEmpty) return;

  value = value.copyWith(status: QueryStatus.fetching, isFetching: true);

  try {
    final firstPage = await fetcher(null);
    if (_isDisposed) return;
    _pages = [firstPage];

    final nextParam = getNextPageParam(firstPage, _pages);

    value = value.copyWith(
      status: QueryStatus.success,
      data: List.from(_pages),
      isFetching: false,
      dataUpdatedAt: DateTime.now(),
      hasNextPage: nextParam != null,
    );
  } catch (e) {
    if (_isDisposed) return;
    value = value.copyWith(
        status: QueryStatus.error, error: e, isFetching: false);
  }
}