toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (locations != null) 'locations': locations!,
if (numberOfItems != null) 'numberOfItems': numberOfItems!,
if (postalCodeGroupNames != null)
'postalCodeGroupNames': postalCodeGroupNames!,
if (prices != null) 'prices': prices!,
if (weights != null) 'weights': weights!,
};