toJson method
Returns the information stored in this object in a way the it could be
encoded via jsonEncode()
.
Implementation
@override
Map<String, dynamic> toJson() {
final Map<String, dynamic> newJson = <String, dynamic>{};
newJson[DirectoryKeys.attribute] = attribute;
if (value != null) newJson[DirectoryKeys.value] = value;
return newJson;
}