moshi 可空列表失败 "required value"

Question

以下作品：

package com.squareup.moshi.problem

import com.squareup.moshi.JsonClass
import com.squareup.moshi.Moshi

@JsonClass(generateAdapter = true)
data class Foo(
        val bar: String?
)

fun main() {
    val adapter=Moshi.Builder().build().adapter<Foo>(Foo::class.java)
    adapter.fromJson("{}")
}

但是当使用列表时它失败了：

package com.squareup.moshi.problem

import com.squareup.moshi.JsonClass
import com.squareup.moshi.Moshi

@JsonClass(generateAdapter = true)
data class Foo(
        val bar: List<String>?
)

fun main() {
    val adapter=Moshi.Builder().build().adapter<Foo>(Foo::class.java)
    adapter.fromJson("{}")
}

与：

Exception in thread "main" com.squareup.moshi.JsonDataException: Required value 'bar' missing at $
        at com.squareup.moshi.internal.Util.missingProperty(Util.java:605)
        at com.squareup.moshi.problem.FooJsonAdapter.fromJson(FooJsonAdapter.kt:44)
        at com.squareup.moshi.problem.FooJsonAdapter.fromJson(FooJsonAdapter.kt:16)
        at com.squareup.moshi.internal.NullSafeJsonAdapter.fromJson(NullSafeJsonAdapter.java:40)
        at com.squareup.moshi.JsonAdapter.fromJson(JsonAdapter.java:43)
        at com.squareup.moshi.problem.MoshiProblemKt.main(MoshiProblem.kt:13)
        at com.squareup.moshi.problem.MoshiProblemKt.main(MoshiProblem.kt)

如何让它适用于列表？这是一个显示问题的回购协议：https://github.com/ligi/moshi_problem

Answer 1

如果柱状图json值为null表示应该是这样

json

{
"bar": null
}

应该是

adapter.fromJson("{"bar":null}")

Answer 2

问题实际上是 moshi 中的这个错误：

https://github.com/square/moshi/issues/990

感谢@cketti 指出我的问题。

moshi 可空列表失败 "required value"

moshi nullable list fails with "required value"

kotlin

moshi