toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (defaultGradeDenominator != null)
'defaultGradeDenominator': defaultGradeDenominator!,
if (id != null) 'id': id!,
if (name != null) 'name': name!,
if (weight != null) 'weight': weight!,
};