copy method
Returns a copy of this
EntityReference instance.
Implementation
@override
EntityReferenceList<T> copy({bool withEntity = true}) {
var cp = EntityReferenceList<T>._(
_type,
_typeName,
_ids?.toList(),
withEntity ? _entities?.toList() : null,
null,
_entityHandler,
_entityProvider,
_entityHandlerProvider,
_entitiesFetcher,
_entityCache,
false);
if (withEntity) cp._entitiesTime = _entitiesTime;
return cp;
}