Question

收到以下致命错误。

致命错误：＆＃39;尝试！＆＃39;表达式意外地引发了错误：错误 Domain = io.realm Code = 1＆＃34;由于以下原因，架构验证失败错误： - Property＆＃39; GearModel.category＆＃39;声明为链接对象属性的来源＆＃39; CategoryRepository.gearList＆＃39;链接到类型＆＃39; CategoryModel＆＃39;＆＃34; UserInfo = {NSLocalizedDescription =由于以下原因导致架构验证失败以下错误： - Property＆＃39; GearModel.category＆＃39;声明为链接对象属性的来源＆＃39; CategoryRepository.gearList＆＃39;链接到类型＆＃39; CategoryModel＆＃39;，错误代码= 1}：

此处的对象模型：Gear Model分配给ONE only Category

import Foundation
import RealmSwift

class GearModel: Object{

    dynamic var gearID = NSUUID().uuidString
    dynamic var name = ""
    dynamic var manufacturer = ""
    dynamic var sortOrder = 0
    dynamic var category: CategoryModel?

    override class func primaryKey() -> String? {return "gearID"}
    }

类别模型：尝试获取已分配类别的所有GearModel项目的列表。

    import Foundation
    import RealmSwift

    class CategoryModel: Object{

        dynamic var categoryID = NSUUID().uuidString
        dynamic var sortOrder = 0
        dynamic var name = ""
        let gearList = LinkingObjects(fromType: GearModel.self, property: "category")

override class func primaryKey() -> String? {return "categoryID"}
    }

类别存储库类：在线上发生致命错误＆＃34;让realm = ....＆＃34;在allCategories（）函数

中

import Foundation
import RealmSwift

class CategoryRepository: CategoryModel{

    class func GetGearItemsForCategory(CategoryID: String) -> Results<GearModel>
    {
        let realm = try! Realm()

        var gearItems = realm.objects(GearModel.self)

        let predicate = NSPredicate(format: "categoryID = %@", CategoryID)
        gearItems = gearItems.filter(predicate)
        return gearItems
    }

    class func GetCountOfGearItems(CategoryID: String) -> Int
    {
        let realm = try! Realm()

        var gearItems = realm.objects(GearModel.self)

        let predicate = NSPredicate(format: "categoryID = %@", CategoryID)
        gearItems = gearItems.filter(predicate)
        return gearItems.count
    }

    class func AddCategory(CategoryID: String, Name: String, SortOrder: Int){

        let realm = try! Realm()

        let category = CategoryModel(name: CategoryID, categoryID: Name, sortOrder: SortOrder)

        try! realm.write {
            realm.add(category)
        }
    }

    class func allCategories() -> Results<CategoryModel> {

        let realm = try! Realm()


        return realm.objects(CategoryModel.self).sorted(byProperty: "SortOrder")
    }

Answer 1

不支持从具有LinkingObjects属性的类继承。

Realm中的Object和List属性不是协变的，这意味着它们只能指向指定的类，而不是该类的子类。这意味着GearModel.category无法链接到CategoryRepository个对象，但CategoryRepository具有继承的gearList属性，该属性尝试列出链接到它的GearModel个对象。

在您的具体情况下，不清楚为什么CategoryRepository继承自CategoryModel。

Realm使用LInkingOjbects在运行时发生致命错误

1 个答案: