Realm中具有延迟属性的复合键 [英] Compound key in Realm with lazy property

问题描述

我发现在Swift中将Realm与复合主键结合使用的绝佳解决方案: https://github.com/realm/realm-cocoa/issues/1192

I found this great solution for using Realm with compound primary key in Swift: https://github.com/realm/realm-cocoa/issues/1192

public final class Card: Object {
  public dynamic var id = 0 {
      didSet {
          compoundKey = compoundKeyValue()
      }
  }
  public dynamic var type = "" {
      didSet {
          compoundKey = compoundKeyValue()
      }
  }
  public dynamic lazy var compoundKey: String = self.compoundKeyValue()
  public override static func primaryKey() -> String? {
      return "compoundKey"
  }

  private func compoundKeyValue() -> String {
      return "\(id)-\(type)"
  }
}

但是我发现Realm不支持惰性属性，在我的情况下，我收到此错误:

But I discovered that Realm does not support lazy properties, in my case I receive this error:

exception NSException *名称:"RLMException"-原因:在Realm Swift对象类上不允许使用懒惰的托管属性'compoundKey'.要么将该属性添加到被忽略的属性列表中，要么使其成为非惰性的. 0x00007f8a05108060

exception NSException * name: "RLMException" - reason: "Lazy managed property 'compoundKey' is not allowed on a Realm Swift object class. Either add the property to the ignored properties list or make it non-lazy." 0x00007f8a05108060

是否还有可能拥有不带惰性属性的复合密钥?

Is it still possible to have compound key without lazy property?

推荐答案

您找到的解决方案已过时.我会在那儿留下笔记.我建议删除lazy修饰符并将compoundKey初始化为空字符串.

The solution you found is outdated. I'll leave a note about that there. I'd suggest removing the lazy modifier and initializing compoundKey to an empty string.

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