Firestore-如何在Kotlin中排除数据类对象的字段 [英] Firestore - how to exclude fields of data class objects in Kotlin

问题描述

Firestore在这里说明了如何使用简单的类将它们直接用于firestore:

Firestore here explains, how I can use simple classes to directly use them with firestore: https://firebase.google.com/docs/firestore/manage-data/add-data

如何将字段标记为已排除?

How can I mark a field as excluded?

data class Parent(var name: String? = null) {
    // don't save this field directly
    var questions: ArrayList<String> = ArrayList()
}

推荐答案

由于Kotlin为字段创建了隐式的getter和setter，因此您需要使用

Since Kotlin creates implicit getters and setters for fields, you need to annotate the setter with @Exclude to tell Firestore not to use them. Kotlin's syntax for this is as follows:

data class Parent(var name: String? = null) {
    // questions will not be serialized in either direction.
    var questions: ArrayList<Child> = ArrayList()
        @Exclude get
}

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