rel<T extends DataClass> method
Returns the dataset that was stored as a child under the relation name passed as parameter
Implementation
DataSet<T> rel<T extends DataClass>(String relationName, {dynamic parentId, bool clear = true}) {
if (_children[relationName] == null) throw Exception();
var child = _children[relationName] as DataSet<T>;
child.updateRoute(child._initialRoute);
if (parentId != null) {
child.updateRoute(child._route.replaceAll(':parentId', parentId));
}
if (clear) {
child.clearList();
child.clearModel();
child.local = {};
child.localViews = {};
}
return child;
}