in service/src/main/java/org/apache/fineract/cn/group/internal/command/handler/GroupAggregate.java [282:291]
public String updateMembers(final UpdateMembersCommand updateMembersCommand) {
this.groupRepository.findByIdentifier(updateMembersCommand.identifier())
.ifPresent(groupEntity -> {
groupEntity.setMembers(StringUtils.collectionToCommaDelimitedString(updateMembersCommand.customerIdentifiers()));
groupEntity.setLastModifiedBy(UserContextHolder.checkedGetUser());
groupEntity.setLastModifiedOn(LocalDateTime.now(Clock.systemUTC()));
this.groupRepository.save(groupEntity);
});
return updateMembersCommand.identifier();
}