在Kotlin中向POJO添加额外的属性

时间:2018-11-15 13:48:42

标签: kotlin retrofit pojo data-class

我通过翻新从API调用中获取以下模型:

data class User(
    @Expose val id: Int
    @Expose var username: String,
    @Expose var phoneNum: String?,
    @Expose var email: String?,
    @Expose var payments: List<PaymentMethod>
)

出于与this SO答案相关的原因,我需要添加一个额外的属性。

额外的参数将是数据类PaymentsMethods:

data class PaymentsMethods(
    val paymentMethods: List<PaymentMethod>
)

创建属性值时如何将其添加到User类?

这是我到目前为止尝试过的:

// add an attribute (with a default value) that won't be filled by the parser.
data class User(
    @Expose val id: Int
    @Expose var username: String,
    @Expose var phoneNum: String?,
    @Expose var email: String?,
    @Expose var payments: List<PaymentMethod>,
    @Expose var paymentsObject: PaymentMethods = PaymentMethods(payments)
)

// create variable and set the value on init
data class User(
    @Expose val id: Int
    @Expose var username: String,
    @Expose var phoneNum: String?,
    @Expose var email: String?,
    @Expose var payments: List<PaymentMethod>
){
init {
    var paymentsObject: PaymentMethods = PaymentMethods(payments)
    }
 }

它们都不起作用。任何建议将不胜感激。

1 个答案:

答案 0 :(得分:0)

我希望这是您需要的:

data class User(
    @Expose val id: Int,
    @Expose var username: String,
    @Expose var phoneNum: String?,
    @Expose var email: String?
) {
    @Expose var payments: List<PaymentMethod> by Delegates.observable(listOf()) { 
        prop, oldValue, newValue ->
        paymentsObject = PaymentMethods(newValue)
    }
    lateinit var paymentsObject: PaymentMethods
}