isFetching method

bool isFetching({
  1. ZenQueryFilter? filter,
  2. Object? queryKey,
  3. String? tag,
  4. bool predicate(
    1. ZenQuery query
    )?,
})

Returns whether queries are currently fetching.

Can optionally be filtered by:

  • filter: Matches queries using a ZenQueryFilter.
  • queryKey: Checks if the specific query matching the key is currently fetching.
  • tag: Checks if any query with the given tag is currently fetching.
  • predicate: Checks if any query matching the custom predicate is currently fetching.

If no filters are provided, returns whether ANY query in the application is currently fetching (ZenQuery.anyFetching).

Implementation

bool isFetching({
  ZenQueryFilter? filter,
  Object? queryKey,
  String? tag,
  bool Function(ZenQuery query)? predicate,
}) {
  if (filter != null) {
    return _queries.values.any((q) => filter.matches(q) && q.isFetching);
  }

  if (queryKey != null) {
    final normalizedKey = QueryKey.normalize(queryKey);
    final query = _queries[normalizedKey];
    return query != null && !query.isDisposed && query.isFetching;
  }

  if (tag != null) {
    final queries = getQueriesByTag(tag);
    return queries.any((q) => q.isFetching);
  }

  if (predicate != null) {
    return _queries.values
        .where((q) => !q.isDisposed)
        .any((q) => predicate(q) && q.isFetching);
  }

  return ZenQuery.anyFetching;
}