UserEntry.kt

@Entity(tableName = "matches",
        foreignKeys = [
            ForeignKey(entity = UserEntry::class,
                    parentColumns = arrayOf("id"),
                    childColumns = arrayOf("id"))
        ])

data class UserEntry(
        @PrimaryKey @ColumnInfo(name = "id") var id: Long? = null,
        @ColumnInfo(name = "name") var name: String? = null,
        var rightEye: EyeEntry? = null,
        var leftEye: EyeEntry? = null
)