KeyPath_mapper.swift

struct TableStructMapper<T> {
    let sizeWidthdKeyPath: KeyPath<T, Int>
    let sizeHeightKeyPath: KeyPath<T, Int>
    let materialKeyPath: KeyPath<T, String>
    
    func map(with mapper: T) -> Table {
        return .init(
            size: .init(
                width: mapper[keyPath: sizeWidthdKeyPath],
                height: mapper[keyPath: sizeHeightKeyPath]
            ),
            material: .init(rawValue: mapper[keyPath: materialKeyPath])! // forceunwrap
        )
    }
}

let mapperNetworkModel = TableStructMapper(
    sizeWidthdKeyPath: \TableDTO.width,
    sizeHeightKeyPath: \TableDTO.height,
    materialKeyPath: \TableDTO.material
)

let mappeCoredataModel = TableStructMapper(
    sizeWidthdKeyPath: \TableEntity.width,
    sizeHeightKeyPath: \TableEntity.height,
    materialKeyPath: \TableEntity.material
)