grails - 无法获得级联保存，无法在嵌入式类引用上删除以正常工作

Question

我创建了两个简单的Grails V3域类，其中位置是这样嵌入父级场所中的属性类型的

import java.time.LocalDate

class Venue {

    String name
    LocalDate dateCreated
    LocalDate lastVisited
    LocalDate lastUpdated
    GeoAddress location

    static hasOne = [location:GeoAddress]

    static embedded =['location']

    static constraints = {
        lastVisited nullable:true
        location    nullable:true
    }
    static mapping = {
        location cascade: "all-delete-orphan", lazy:false  //eager fetch strategy

    }
}


class   GeoAddress {

    String addressLine1
    String addressLine2
    String addressLine3
    String town
    String county
    String country = "UK"
    String postcode

    static belongsTo = Venue

    static constraints = {
        addressLine1 nullable:true
        addressLine2 nullable:true
        addressLine3 nullable:true
        town         nullable:true
        county       nullable:true
        country      nullable:true
        postcode     nullable:true
    }
}

但是，当我编写一个集成测试时，我发现位置的级联创建不起作用(在传递到 field 之前，我必须保存该位置不再是临时的。

另外，当我在启用了flush:true的场所运行删除并查询地址时，我仍然获得返回的嵌入式地址-我认为使用flush:true会看到我的GeoAddress级联删除，但是我的测试失败了正如我期望的那样，在使用GeoAddress.get(loc.id)时不会得到null

@Integration
@Rollback
class VenueIntegrationSpec extends Specification {
  void "test venue with an address" () {
        when: "create a venue and an address using transitive save on embedded "
            GeoAddress address = new GeoAddress (addressLine1: "myhouse", town: "Ipswich", county: "suffolk", postcode : "IP4 2TH")
            address.save()  //have to save first - else Venue save fails

            Venue v = new Venue (name: "bistro", location: address)
            def result = v.save()

        then: "retrieve venue and check its location loaded eagerly "
            Venue lookupVenue = Venue.get(v.id)
            GeoAddress loc = lookupVenue.location
            loc.postcode == "IP4 2TH"
            loc.town == "Ipswich"

        when: " we delete the venue, it deletes the embedded location (Address)"
            v.delete (flush:true)
            GeoAddress lookupLoc = GeoAddress.get (loc.id)

        then: "address should disppear"
            lookupLoc == null
    }

我以为我已经正确设置了，但是显然没有。为什么我对Venue.save()和delete()的级联操作不能级联到我的嵌入式位置(GeoAddress)条目？

Answer 1

如果我正确理解
cascade: "all-delete-orphan"
仅当您有hasMany=[something:Something]时才需要

在您的情况下，如果我要创建这样的关系，则hasOne或GeoAddress location可能是更好的设置。我知道两者之间会有细微的差异。

无论如何，您都在进行理论上的测试。我认为您需要捕获错误才能开始弄清楚为什么它没有将预期的行为串联起来。所以要么

if (!v.delete(flush:true) { 
  println "---  ${v.errors}" 
}

或包起来

try catch block

。我对hasMany关系有一个类似的问题，这是由于底层hasMany表关系本身的设置而导致与其他表共享记录。技巧是仅从对象本身中删除条目:
lookupVenue .removeFromLocation(loc)
正如我所说的，这是一个hasMany关系