getRelation<T> method
Retrieves a cached relation value typed as T.
Returns null if the relation hasn't been loaded or is explicitly null.
Example:
final author = post.getRelation<Author>('author');
Implementation
T? getRelation<T>(String name) {
final relations = _relationValues[this];
if (relations == null || !relations.containsKey(name)) {
return null;
}
return relations[name] as T?;
}