实体的元数据未定义

Question

我正在尝试将两个实体与 n:m 关系、乐队和事件联系起来。当一个事件被移除时，乐队应该保留。但是，作为活动的一部分，乐队可能不会被移除。

附加的测试用例失败并显示以下日志：

    2020-03-02 21:54:32.583 [Test worker] DEBUG c.j.t.dnq.database.ConstraintsUtil - Cannot check links cardinality for entity XdEvent: id = 0-0. Entity metadata for its type [XdEvent] is undefined
    2020-03-02 21:54:32.583 [Test worker] DEBUG c.j.t.dnq.database.ConstraintsUtil - Cannot check links cardinality for entity XdBand: id = 1-0. Entity metadata for its type [XdBand] is undefined

问题似乎是缺少实体元数据，但我找不到任何相关文档或类似问题。有人知道解决方法吗？

实体

class XdBand(entity: Entity) : XdEntity(entity) {
    companion object : XdNaturalEntityType<XdBand>()

    var name by xdRequiredStringProp(unique = true)
    var image by xdBlobProp()
    val events: XdMutableQuery<XdEvent> by xdLink0_N(XdEvent::bands, onDelete = OnDeletePolicy.FAIL)
}

class XdEvent(entity: Entity) : XdEntity(entity) {
    companion object : XdNaturalEntityType<XdEvent>()

    var date by xdRequiredDateTimeProp()
    /**
     * Milliseconds since midnight
     */
    var startTime by xdIntProp()
    /**
     * Milliseconds since midnight
     */
    var endTime by xdIntProp()
    val bands : XdMutableQuery<XdBand> by xdLink1_N(XdBand::events, onDelete = OnDeletePolicy.CLEAR)
}

测试用例

@Test(expected = ConstraintsValidationException::class)
fun testCannotRemoveBandWithEvent() {
    val bandName = "Some Band"
    Database.store.transactional {
        val event = XdEvent.new {
            date = LocalDate.now().toDateTime(LocalTime.MIDNIGHT)
            startTime = 0
            endTime = 0
        }
        XdBand.new {
            name = bandName
            events.add(event)
        }
    }

    Database.store.transactional {
        XdBand.all().first().delete()
    }
}

Answer 1

您需要在 XdModel 中注册此类型，然后传播此类型以存储：

        XdModel.registerNodes(XdBand, XdEvent)
        initMetaData(XdModel.hierarchy, store)

您可以使用 XdModel#scanPackages 或 XdModel#scanJavaClasspath 方法来查找所有可用类型，而不是 XdModel#registerNodes 方法。

实体的元数据未定义

Metadata for entity is undefined

xodus

xodus-dnq

实体

测试用例