toMap method
Implementation
Map<String, dynamic> toMap() {
return {
if (maxValuesPerFacet != null) 'maxValuesPerFacet': maxValuesPerFacet,
if (sortFacetValuesBy != null)
'sortFacetValuesBy':
sortFacetValuesBy?.map((key, value) => MapEntry(key, value.value)),
};
}