Codable CoreData 模型因“发送到实例的无法识别的选择器”而崩溃

Question

所以，我正在尝试使我的模型 classes 符合 NSManagedObject（对于 CoreData 持久性）和 Codable（对于 JSON serialization/deserialization）。现在，我的 JSON 解码器在因错误

崩溃之前大约完成了反序列化的一半

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Land setGun:]: unrecognized selector sent to instance 0x60400028f780'

我一直在遵循此处找到的两个模型协议的一致性指南并且我意识到抛出错误是因为（如果要相信错误的话）Land class没有 'setGun' 方法。让我感到困惑的是

A) 我在解码 Land class JSON 时没有发生错误（它可以毫无问题地处理），最后一个断点实际上是在 Sea class 的 JSON 解码器。

B) The Land class 确实有一个 'setGun' 方法（我在 class 中声明了一个占位符方法只是为了更加确定它是否与自动生成的 CoreData 代码）。

我的土地 class 代码如下：

import Foundation
import CoreData
@objc(Land)
class Land : NSManagedObject, Equipment {
var type = EquipmentType.LAND

enum CodingKeys: String, CodingKey {
    case id
    case name
    case desc = "description"
    case groupIconUrl
    case individualIconUrl
    case photoUrl
    case primaryWeapon
    case secondaryWeapon
    case atgm
    case armor
    case speed
    case auto
    case weight
}

required convenience init(from decoder: Decoder) throws {
    guard let context = decoder.userInfo[CodingUserInfoKey.context!] as? NSManagedObjectContext else { fatalError() }
    guard let entity = NSEntityDescription.entity(forEntityName: "Land", in: context) else { fatalError() }
    self.init(entity: entity, insertInto: context)
    let container = try! decoder.container(keyedBy: CodingKeys.self)
    self.id = try container.decode(Int64.self, forKey: .id)
    self.name = try container.decodeIfPresent(String.self, forKey: .name)
    self.desc = try container.decodeIfPresent(String.self, forKey: .desc)
    self.groupIconUrl = try container.decodeIfPresent(String.self, forKey: .groupIconUrl)
    self.individualIconUrl = try container.decodeIfPresent(String.self, forKey: .individualIconUrl)
    self.photoUrl = try container.decodeIfPresent(String.self, forKey: .photoUrl)
    self.primaryWeapon = try container.decodeIfPresent(Gun.self, forKey: .primaryWeapon)
    self.secondaryWeapon = try container.decodeIfPresent(Gun.self, forKey: .secondaryWeapon)
    self.atgm = try container.decodeIfPresent(Gun.self, forKey: .atgm)
    self.armor = try container.decode(Int64.self, forKey: .armor)
    self.speed = try container.decode(Int64.self, forKey: .speed)
    self.auto = try container.decode(Int64.self, forKey: .auto)
    self.weight = try container.decode(Int64.self, forKey: .weight)
}
public func encode(to encoder: Encoder) throws {
    var container = encoder.container(keyedBy: CodingKeys.self)
    try container.encode(id, forKey: .id)
    try container.encode(name, forKey: .name)
    try container.encode(desc, forKey: .desc)
    try container.encode(groupIconUrl, forKey: .groupIconUrl)
    try container.encode(individualIconUrl, forKey: .individualIconUrl)
    try container.encode(photoUrl, forKey: .photoUrl)
    try container.encode(primaryWeapon, forKey: .primaryWeapon)
    try container.encode(secondaryWeapon, forKey: .secondaryWeapon)
    try container.encode(atgm, forKey: .atgm)
    try container.encode(armor, forKey: .armor)
    try container.encode(speed, forKey: .speed)
    try container.encode(auto, forKey: .auto)
    try container.encode(weight, forKey: .weight)
}
public func setGun(gun: Gun){}
}

我的CoreData数据模型也被截屏如下：

最后，如果所有这些还不足以诊断出问题所在，您可以自由克隆存储库并从以下 public github 存储库本地运行它: https://github.com/jamesjmtaylor/weg-ios

Answer 1

您在 Air.swift 文件中这一行的问题我真的不知道为什么不在Air file Decoder

解码Gun

self.gun = try container.decodeIfPresent(Gun.self, forKey: .gun)
self.agm = try container.decodeIfPresent(Gun.self, forKey: .agm)
self.aam = try container.decodeIfPresent(Gun.self, forKey: .aam)
self.asm = try container.decodeIfPresent(Gun.self, forKey: .asm)

Codable CoreData 模型因“发送到实例的无法识别的选择器”而崩溃

Codable CoreData models crash with `Unrecognized selector sent to instance`

swift

core-data

unrecognized-selector

codable