Koha::Biblio::ItemGroup - Koha ItemGroup Object class
$item_group->store;
Overloaded store method that takes care of creation date handling.
my $items = $item_group->items;
Returns all the items linked to the item group.
$item_group->add_item({ item_id => $item_id });
This method returns the mapping for representing a Koha::Biblio::ItemGroup object on the API.