Error message when opening a SwiftData ModelContainer

I don't see the error something to be concerned because it doesn't bring any real issue, but do you have a reproducible case? If you have and don't mind to share the details (the code snippet, the version of system and Xcode, etc), I'd be interested in taking a closer look.

Best,
——
Ziqiao Chen
 Worldwide Developer Relations.

I am facing the same error in my app.

Here is an example of my code to reproduce it.

ModelContainer:

    var sharedModelContainer: ModelContainer = {
        
        let modelConfiguration = ModelConfiguration(schema: Schema(versionedSchema: CurrentModelSchema.self), isStoredInMemoryOnly: false)

        do {
            let container = try ModelContainer(
                for: Schema(versionedSchema: CurrentModelSchema.self),
                migrationPlan: AppMigrationPlan.self,
                configurations: [modelConfiguration]
            )
            return container
        } catch {
            fatalError("Could not create ModelContainer: \(error)")
        }
    }()

CurrentModelSchema:

/// Current model schema
typealias CurrentModelSchema = ModelSchemaV3

/// Model references
typealias Test1 = CurrentModelSchema.Test1
typealias Test1 = CurrentModelSchema.Test2

The typealiases Test1 and Test2 are @Model-Classes.

AppMigrationPlan:

enum AppMigrationPlan: SchemaMigrationPlan {
    
    static var schemas: [any VersionedSchema.Type] {
        [ModelSchemaV1.self, ModelSchemaV2.self, ModelSchemaV3.self]
    }
    
    static let migrateV1toV2 = MigrationStage.custom(
        fromVersion: ModelSchemaV1.self,
        toVersion: ModelSchemaV2.self,
        willMigrate: nil, // Logic to perform the migration of V1 schema
        didMigrate: { context in
            // Logic to perform the migration of V2 schema
            let tests = try context.fetch(FetchDescriptor<ModelSchemaV2.Test1>())
            // Do the migration operation....
            }
            try context.save()
        }
    )
    
    static let migrateV2toV3 = MigrationStage.lightweight(
        fromVersion: ModelSchemaV2.self,
        toVersion: ModelSchemaV3.self
    )
    
    static var stages: [MigrationStage] {
        // Migration stage that will be performed
        [migrateV1toV2, migrateV2toV3]
    }
}

Please let me know if you need more details to reproduce it.

Thanks for your info, @Ghostwalk. I reproduced the error – As the message says, it is triggered because SwiftData needs to access the version checksum before the model is loaded to the Core Data stack. I am pretty sure that has no harm on apps. Meanwhile, I don't see anything apps can do to eliminate it, and so would suggest that you file a feedback report to hopefully get attentions from the SwiftData team – If you do so, please your report ID here for folks to track. Thanks.

Best,
——
Ziqiao Chen
 Worldwide Developer Relations.

I filed a bug FB15592048 for it.