让用户可以自行对某些字段进行完全的自定义操作

class Student: HandyJSON {
var id: String?
var name: String?
var age: Int?
var grade: Grade = .One
var height: Int?
var gender: Gender?
var className: String?
var teacher: Teacher = Teacher()
var subjects: [Subject]?
var seat: String?

required init() {}
// 父类不实现此方法,子类也不会调用
// func mapping(mapper: HelpingMapper) {
//// mapper <<<
//// self.descriptionValue <-- "description"
// // mapper.specify(property: &Ï, name: "description")
// }
}

class MissionDetailModel: Student {
var attachments: [String]?
var deadLine: String?
var descriptionValue: String?
var hunter: String?
var walletId: String?
var actionTypes: [String]?

required init() {
super.init()
}

override func mapping(mapper: HelpingMapper) {
super.mapping(mapper: mapper)
mapper <<<
self.descriptionValue <-- "description"
// mapper.specify(property: &Ï, name: "description")
}

}

Start with the Student and MissionDetailModel examples in the issue and inspect the HelpingMapper mapping API and inheritance behavior. Reproduce whether MissionDetailModel.mapping can customize descriptionValue while retaining inherited mappings; done means a supported, test-covered way for a field to use fully custom mapping behavior.

Written by the indexing model from the issue text.