默认情况下返回toString（）\u id mongo spring boot kotlin

嗨，我是Kottling的新手，我正在使用mongoDB作为数据库进入REST服务 我试图从数据库及其作品中获取信息，但_id显示为对象而不是字符串

回应

[
    {
        "id": {
            "timestamp": 1622599648,
            "date": "2021-06-02T02:07:28.000+00:00"
        },
        "name": "test",
        "description": "test",
        "createdDate": "2021-06-01T21:07:28.385",
        "modifiedDate": "2021-06-01T21:07:28.385"
    },
    {
        "id": {
            "timestamp": 1622600161,
            "date": "2021-06-02T02:16:01.000+00:00"
        },
        "name": "test",
        "description": "test",
        "createdDate": "2021-06-01T21:16:01.669",
        "modifiedDate": "2021-06-01T21:16:01.669"
    }
]

类别：

@Document
data class Patient (
        @Id
        
        val id: ObjectId = ObjectId.get(),
        val name: String,
        val description: String,
        val createdDate: LocalDateTime = LocalDateTime.now(),
        val modifiedDate: LocalDateTime = LocalDateTime.now()
        )

interface PatientRepository : MongoRepository<Patient, String> {
        fun findOneById(id: ObjectId): Patient
        override fun deleteAll()
}

@文档
数据类患者(
@身份证
val id:ObjectId=ObjectId.get（），
val name:String，
val说明：字符串，
val createdDate:LocalDateTime=LocalDateTime.now（），
val modifiedDate:LocalDateTime=LocalDateTime.now（）
)
接口PatientPository:MongorPository{
fun findOneById（id:ObjectId）：患者
覆盖所有
}

---

如何将id转换为字符串？当我检索数据时？

您需要使用序列化程序将ObjectId转换为带有bean的字符串

@Bean
    fun customizer(): Jackson2ObjectMapperBuilderCustomizer? {
        return Jackson2ObjectMapperBuilderCustomizer { builder: Jackson2ObjectMapperBuilder -> builder.serializerByType(ObjectId::class.java, ToStringSerializer()) }
    }

政府的回应是：

[
    {
        "id": "60b6e7e03c52e16a1a1b000c",
        "name": "test",
        "description": "test",
        "createdDate": "2021-06-01T21:07:28.385",
        "modifiedDate": "2021-06-01T21:07:28.385"
    },
    {
        "id": "60b6e9e11194486befd09e8c",
        "name": "test",
        "description": "test",
        "createdDate": "2021-06-01T21:16:01.669",
        "modifiedDate": "2021-06-01T21:16:01.669"
    }
]

---

我不知道科特林是怎么工作的。您提到了spring boot，有时您可能会从@varman那里得到一些想法，谢谢！