[英]Make a field optional in Kotlinx serialization
Here is my pojo class这是我的 pojo 课
@Serializable
data class Response(
@SerialName("message") val message: String?,
@SerialName("parameters") val parameters: Map<String, String>?
)
And this is Json, I was trying to decode from:这是 Json,我试图从以下内容解码:
{
"message": "Some text"
}
Here, the field parameters
is optional.此处,字段parameters
是可选的。 When I try to decode like当我尝试解码时
Json.decodeFromString<Response>(response)
I am getting the following exception:我收到以下异常:
kotlinx.serialization.MissingFieldException: Field 'parameters' is required for type with serial name 'Response', but it was missing kotlinx.serialization.MissingFieldException:序列名称为“Response”的类型需要字段“parameters”,但缺少字段
I was looking forward to set the field parameters
to null
, if the field is missing in the Json
我期待将字段parameters
设置为null
,如果该字段在Json
丢失
You need to specify a default value for your parameters
property like this:您需要为parameters
属性指定一个默认值,如下所示:
@Serializable
data class Response(
@SerialName("message") val message: String?,
@SerialName("parameters") val parameters: Map<String, String>? = null
)
You can read more about this here: https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/basic-serialization.md#optional-properties您可以在此处阅读更多相关信息: https : //github.com/Kotlin/kotlinx.serialization/blob/master/docs/basic-serialization.md#optional-properties
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