Grails 2.4.2:嵌套事务中奇怪的级联保存行为

时间:2014-07-08 09:06:13

标签: grails groovy gorm

我有一些奇怪的行为,我的对象图中的保存级别不正确。也许它与嵌套事务有关,但可能没有。

以下是我的3个域类:

Station.groovy

class Station {

  /** Dependency injected {@link de.hutapp.tapandknow.system.SettingsService}.*/
  def settingsService

  static hasMany = [localizedStations: LocalizedStation, 
    stationIdentifiers: AbstractStationIdentifier]

}

LocalizedStation.groovy

class LocalizedStation {

  /** Delete-cascade from the {@link Station} parent. */
  static belongsTo = [station : Station]

  /** An image that represents the LocalizedStation. */
  MediaFile headerImage

  /** The articles inside this LocalizedStation .*/
  List<Article> articles

  static hasMany = [articles: Article]

  static mapping = {
      headerImage cascade: 'all'
      articles cascade: 'all-delete-orphan'
  }
}

MediaFile.groovy

class MediaFile {

  /* some basic properties here*/

  static constraints = {
      name blank: false
      originalFilename blank: false
      description blank: false
  }

  def beforeDelete() {
      // delete the associated file
      new File(getFileLocation()).delete()
  }
}

因此对象图是Station-&gt; LocalizedStation-&gt; MediaFile

我使用以下服务方法保存/更新对象:

StationService.groovy

@Transactional
class StationService {

def mediaFileService

/**
 * Creates a new {@link Station} and saves it.
 * @return The newly created {@link Station} instance.
 */
Station createStation(LocalizedStation localizedStationInstance, InputStream headerImage, String originalFilename) {

    localizedStationInstance = updateLocalizedStation(localizedStationInstance, headerImage, originalFilename)

    Station stationInstance = new Station()
    stationInstance.addToLocalizedStations(localizedStationInstance)
    stationInstance.save()
    stationInstance.localizedStations[0].headerImage.save() // TODO: check why this is necessary

    return stationInstance
}

LocalizedStation updateLocalizedStation(LocalizedStation localizedStationInstance, InputStream headerSource, String originalFilename) {

    if (headerSource) {
        MediaFile headerFile = mediaFileService.createMediaFile(headerSource, originalFilename, "foobar") // TODO: add description
        localizedStationInstance.headerImage = headerFile
    }

    localizedStationInstance.save()
    return localizedStationInstance

}
}

MediaFileService.groovy

@Transactional
class MediaFileService {

MediaFile createMediaFile(InputStream input, String originalFilename, String description) {

    MediaFile mediaFileInstance = new MediaFile(
            name: originalFilename,
            description: description)

    mediaFileInstance.save(flush: true) // flush for id
    mediaFileInstance.storeMediaFile(input, originalFilename)
    mediaFileInstance.save()

    return mediaFileInstance
}
}

如您所见,如果我调用stationService.createStation(),我必须手动保存挂在LocalizedStation上的MediaFile。只有在我调用createStation()时才会发生这种情况,而createStation()本身调用的是updateLocalizedStation()。 然后,除非我在createStation()中明确保存,否则不会保留MediaFile。

如果我直接调用updateLocalizedStation(),一切都按预期工作。

有任何想法或建议吗?


更新:

如果我将@Transactional(propagation = Propagation.REQUIRES_NEW)添加到createMediaFile()方法,这个问题就会消失。

据我了解文档,这会创建一个新事务。但这不是我想要的,我想要一个涵盖所有方法的交易。

0 个答案:

没有答案