android - CapturedTypeConstructor(*) 不是 RealmModel 的子类型

Question

我有以下方法可以为 Realm 对象获取新 key 。我希望能够将类作为参数传递:

private fun getNextKeyForObject(myClass: Class<*>): Int {
    mRealm?.let {
        val maxId = it.where(myClass).max("id")
        if (maxId != null) {
            return it.where(myClass).max("id").toInt() + 1
        }
    }
    return 0
}

我收到以下错误:

Type parameter bound for E in fun <E : RealmModel!> where(clazz: Class<E!>!): RealmQuery<E!>!
 is not satisfied: inferred type CapturedTypeConstructor(*) is not a subtype of RealmModel!

Answer 1

您需要指定一个通用上限(参见https://kotlinlang.org/docs/reference/generics.html#upper-bounds):

private fun <T : RealmModel> getNextKeyForObject(myClass: Class<T>): Int {