我有一个像下面这样的模型

data class BaseModel(
    val title: String,
    val number: Int,
    val items: List<BaseModel>? = null
)

并且该模型被生成为

fun generateModel(): List<BaseModel> {
    val childItem1 = BaseModel("child1", 1)
    val childItem2 = BaseModel("child2", 2)
    val childItem3 = BaseModel("child3", 3)
    val childItem4 = BaseModel("child4", 4)
    val childItem5 = BaseModel("child5", 5)
    val childItem6 = BaseModel("child6", 6)
    val childItem7 = BaseModel("child7", 7)
    val childItem8 = BaseModel("child8", 8)

    val childList1 = arrayListOf(childItem1, childItem2, childItem3)
    val childList2 = arrayListOf(childItem4, childItem5)
    val childList3 = arrayListOf(childItem6, childItem7, childItem8)

    val parentItem1 = BaseModel("parent1", 11, childList1)
    val parentItem2 = BaseModel("parent2", 22, childList2)
    val parentItem3 = BaseModel("parent3", 33, childList3)

    return arrayListOf(parentItem1, parentItem2, parentItem3)
}

如何从该数组中过滤编号为7的BaseModel对象？[ title: "parent3", number: 33, items: [ title: "child7", number: 7, items: null ] ]
我尝试了许多方法使用Map和过滤器，但无法达到的结果。