toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (contents != null) 'contents': contents!,
if (predefinedRubricGenerationSpec != null)
'predefinedRubricGenerationSpec': predefinedRubricGenerationSpec!,
if (rubricGenerationSpec != null)
'rubricGenerationSpec': rubricGenerationSpec!,
};