ios – Deadly error throughout migration so as to add an enum discipline

I am migrating my two SwiftData fashions to a V2 VersionedSchema.

On this migration, I do the next modifications:

• Change two discipline varieties
• Change a Relationship deleteRule
• Add a discipline with a Codable enum for kind

Fashions

V1

    @Mannequin
    class DM1 {
        var a: Date
        var b: Date
        var c: Int
        @Relationship(deleteRule: .cascade) var d = [DM2]()
    }
    
    @Mannequin
    class DM2 {
        var e: String
        var f: Date
        var g: Int
        var h: String
        var i: Bool
    }

V2

    @Mannequin
    class DM1 {
        var a: Date
        var b: Date
        var c: TimeInterval? // modified
        var j: EnumJ // added
        @Relationship(deleteRule: .noAction) var d = [DM2]() // modified
    }
    
    @Mannequin
    class DM2 {
        var e: String
        var f: Date
        var g: TimeInterval // modified
        var h: String
        var i: Bool
    }

Migrations

    static let migrateV1toV2 = MigrationStage.customized(
        fromVersion: SchemaV1.self,
        toVersion: SchemaV2.self,
        willMigrate: { context in
            let previousDM1 = attempt context.fetch(FetchDescriptor<SchemaV1.DM1>())
            let previousDM2 = attempt context.fetch(FetchDescriptor<SchemaV1.DM2>())
            
            for dm2 in previousDm2 {
                let newDm2 = SchemaV2.DM2(
                    e: dm2.e,
                    f: dm2.f,
                    g: TimeInterval(dm2.g),
                    h: dm2.h,
                    i: dm2.i
                )
                context.insert(newDm2)
            }
            
            for dm1 in previousDm1 {
                let newDm1 = SchemaV2.DM1(
                    a: dm1.a,
                    b: dm1.b,
                    j: .aValue,
                    c: TimeInterval(dm1.c)
                )
                context.insert(newDm1)
            }
            
            attempt context.save()
        }, didMigrate: nil)

EnumJ

    enum EnumJ: Codable {
        case aValue
        // Just one case is right here for now
        // This enum is for future options
    }

Configuration

    container = attempt ModelContainer(
        for: DM1.self, DM2.self,
        migrationPlan: MigrationPlan.self
    )

Drawback

When operating the app on a simulator with the database V1, the app crashes with the next error:

Deadly error: Anticipated solely Arrays for Relationships - EnumJ

After clearing the app knowledge, eradicating the necessity for a migration, the app works high quality.
I simply cannot get the migration to work.