1

I’m using your Sync library for my Kotlin Multiplatform project for Android and iOS. I’ve been able to authenticate and create the user/collection before. Suddenly when I try to configure the realm, before signing in and interacting with the database, I get this error without any detailed information. It’s not the first time to work with Mongodb Device sync SDK, but this time I don’t see anything strange in the project logs, nor on the logs on MongoDB Atlas? Strange…

java.lang.IllegalStateException: [RLM_ERR_SCHEMA_VALIDATION_FAILED]: Schema validation failed due to the following errors:

Stacktrace:

System.out              com.stevdza_san.codingquizzie        I  	at io.realm.kotlin.internal.ConfigurationImpl$openRealm$2.invoke(ConfigurationImpl.kt:115)
System.out              com.stevdza_san.codingquizzie        I  	at io.realm.kotlin.internal.ConfigurationImpl$openRealm$2.invoke(ConfigurationImpl.kt:114)
System.out              com.stevdza_san.codingquizzie        I  	at io.realm.kotlin.internal.ConfigurationImpl.openRealm$suspendImpl(ConfigurationImpl.kt:114)
System.out              com.stevdza_san.codingquizzie        I  	at io.realm.kotlin.internal.ConfigurationImpl.openRealm(Unknown Source:0)
System.out              com.stevdza_san.codingquizzie        I  	at io.realm.kotlin.mongodb.internal.SyncConfigurationImpl.openRealm(SyncConfigurationImpl.kt:138)
2

I’ve found the reason. Here’s my structure:

open class Quiz: RealmObject {
   ...
   var _id: ObjectId = ObjectId()
   var questions: RealmList<QuizQuestion> = realmListOf()
}

open class QuizQuestion: EmbeddedRealmObject {
   ...
   var codeExample: CodeExample = CodeExample()
}

open class CodeExample: EmbeddedRealmObject {
   ...
}

To fix the issue, I had to add codeExample as nullable type, with a null as a default value. Then the error disappeared. Hope it helps someone. :slight_smile:

open class QuizQuestion: EmbeddedRealmObject {
   ...
   var codeExample: CodeExample? = null
}
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