Ios 如何使用realm swift检索另一个对象列表中的对象？

我有一些领域类如下所示：

class Friends: Object {
    dynamic var name = true
    dynamic var role = true
    dynamic var type = true
    dynamic var owner: Profile?
}

class Profile: Object {
    dynamic var uuid = NSUUID().UUIDString
    dynamic var name = ""
    dynamic var date = NSDate(timeIntervalSinceNow: 1)
    dynamic var section = 0
    dynamic var code = ""
    dynamic var gender = 0
    dynamic var type = ""
    let friends = List<Friends>()

    override static func primaryKey() -> String? {
       return "uuid"
    }
}

class Sub: Profile {
    dynamic var owner: Master?
}

class Master: Object {
    dynamic var type = ""
    dynamic var name = ""
    dynamic var date = ""
    let subs = List<Sub>()
}

---

问题是：如何从“subs”（列表）中检索对象？

检索主对象时，可以像访问任何其他属性一样访问其subs列表：

let subs = profile.subs

这将为您提供一个可以迭代的列表：

for sub in profile.subs {
    // do something with the sub object
}

或者，您可以筛选子对象以查找特定对象：

if let subjectWithId = profile.subs.filter("uuid == '7382a8d83'").first {
    // do something with the subject
}

也可以使用订阅按索引访问元素：

let secondProfile = profile.subs[1]

let secondProfile = profile.subs[1]