RLM_ERR_SCHEMA_VALIDATION_FAILED：Realm数组关联EmbeddedRealmObject验证失败求助

我定义了几个简单的RealmObject类，代码如下：

class Patient : RealmObject {
@PrimaryKey
var _id: ObjectId = ObjectId()
var firstName: String = ""
var lastName: String = ""
var visits: RealmList<PelletInsertionVisit> = realmListOf()
var lastFourOfSSN: String = ""
}

class PelletInsertionVisit : RealmObject {
@PrimaryKey
var _id: ObjectId = ObjectId()
var visitDate = LocalDateTime.now().toEpochSecond(ZoneOffset.UTC)
var pelletsUsed: RealmList<Pellet> = realmListOf()
}

class Pellet: EmbeddedRealmObject {
var size = PelletSize.ZERO.value
var lotNumber: String = "UNKNOWN"
}

执行以下代码时，调用Realm.open()抛出异常：

fun openPatientRealm() : Realm {
val configuration = RealmConfiguration.create(schema = setOf(Patient::class))
Logger.d("About to open Realm Configuration: $configuration")

try {
    val realm = Realm.open(configuration)  //EXCEPTION HERE

    Logger.d("Realm opened: : ${realm.toString()}")

    return realm
}
catch (ex: Exception) {
    Logger.e("Exception caught: " + ex.message)
    Logger.e("Stack trace: " + ex.stackTraceToString())
}

throw Exception("Realm Could Not be Opened")
}

异常信息：

[RLM_ERR_SCHEMA_VALIDATION_FAILED]: Schema validation failed due to the following errors:

• Property 'PelletInsertionVisit.pelletsUsed' of type 'array' has unknown object type 'Pellet'

我按照文档使用EmbeddedRealmObject，但仍出现该问题，请问哪里操作错误？

问题出在Realm配置的schema集合里——你只添加了Patient::class，但Realm无法自动递归识别嵌套的嵌入式对象Pellet。即便Pellet是EmbeddedRealmObject，当它被包含在RealmList中时，必须显式将其加入配置的schema中。

修改配置代码，把所有涉及到的Realm对象（包括嵌入式对象）都加入schema集合：

val configuration = RealmConfiguration.create(
    schema = setOf(Patient::class, PelletInsertionVisit::class, Pellet::class)
)

这样Realm就能识别到Pellet类型，解决schema验证失败的问题。

内容的提问来源于stack exchange，提问作者user443654