findContactsWithFirstName method
Implementation
Set<int> findContactsWithFirstName(String queryString) {
final herdersMatch = all
.where((c) => c.firstName.clean.contains(queryString.clean))
.toList();
final herdersMatchIds = Set.of(<int>{});
for (final herder in herdersMatch) {
herdersMatchIds.add(herder.id);
}
return herdersMatchIds;
}