使用Swift过滤Realm对象

尝试使用nspredicate过滤我的Realm数据库时,我总是遇到以下错误：

Property ‘text’ is not a link in object of type ‘getType’

我想过滤我的Realm数据库,只显示其中包含特定文本的项目.这就是我尝试过的：

let realm = try! Realm()
let predicate = nspredicate(format: "typez.text.filter = 'special'")
let filterThis = realm.objects(Publication).filter(predicate)
print(filterThis)

我的模型类的相关部分是：

class Publication: Object,Mappable {
    dynamic var id: Int = 0
    var typez = List<getType>()
    dynamic var url: String?
}

class getType: Object,Mappable {
    dynamic var text: String = ""
}

我通常不直接使用nspredicate,而是在过滤器参数中进行内联谓词闭包.

let realm = try! Realm()
                     //Array of publications             
    let realmObjects = realm.objects(Publication)
    //any publication where .text property == special will be filtered. and filter out empty array
    let filterThis = realmObjects.filter({ $0.getType.filter({ $0.text == "special" } != [] ) })
    print(filterThis)