如何在 Realm 中列出 LinkingObjects 属性？

Question

我需要列出一个对象的 LinkingObjects 类型的所有属性。

class Dogs: Object {
    dynamic var name: String = ""
    dynamic var age: Int = 0
    dynamic var owner: Persons?
}


class Cats: Object {
    dynamic var name: String = ""
    dynamic var age: Int = 0
    dynamic var owner: Persons?
}


class Persons: Object {
    dynamic var name: String = ""
    dynamic var address: String = ""

    let dogs = LinkingObjects(fromType: Dogs.self, property: "owner")
    let cats = LinkingObjects(fromType: Cats.self, property: "owner")
}

ObjectSchema 正确返回架构：

let person = Persons()
let schema = person.objectSchema
print(schema)

结果：

Persons {
 name {
    type = string;
    objectClassName = (null);
    linkOriginPropertyName = (null);
    indexed = NO;
    isPrimary = NO;
    optional = NO;
 }
 address {
    type = string;
    objectClassName = (null);
    linkOriginPropertyName = (null);
    indexed = NO;
    isPrimary = NO;
    optional = NO;
 }
 dogs {
    type = linking objects;
    objectClassName = Dogs;
    linkOriginPropertyName = owner;
    indexed = NO;
    isPrimary = NO;
    optional = NO;
 }
 cats {
    type = linking objects;
    objectClassName = Cats;
    linkOriginPropertyName = owner;
    indexed = NO;
    isPrimary = NO;
    optional = NO;
 }
}

但是，objectSchema.properties 不返回 LinkingObjects 属性。

let properties = schema.properties
print(properties)

返回：

[name {
    type = string;
    objectClassName = (null);
    linkOriginPropertyName = (null);
    indexed = NO;
    isPrimary = NO;
    optional = NO;
}, address {
    type = string;
    objectClassName = (null);
    linkOriginPropertyName = (null);
    indexed = NO;
    isPrimary = NO;
    optional = NO;
}]

狗和猫的属性在哪里？

谢谢。

Answer 1

我找到了解决方案：

let computedProperties = Persons.sharedSchema()?.computedProperties

Answer 2

该LinkingObjects性能列在computedProperties财产RLMObjectSchema ，这是目前尚未公开或者存在的类的斯威夫特版本。 虽然给定 obj-c 类的实例（通过.valueForKey("computedProperties") ）可以访问私有属性，但这不适用于 Swift 并且没有任何好的方法可以访问使用 Realm Swift 时的 obj-c RLMObjectSchema 。

有一个现有的功能请求来公开 this 。