如何删除 grails 中的 child 域行

Question

我正在将数据保存到我的入门会议 table 以及入门会议详细信息 table，这是入门会议 child table table .但是当我只想删除 child table 记录时，它会出错。我不知道该怎么办。我正在使用 grails 2.1.0。谁能帮我解决这个问题？！！！下面是我的代码：

我的 parent 域 >>>

class AdtEntryMeeting {
    static mapping = {
        table('ADT_ENTRY_MEETING')
        version(false)
        entryMeetingDetails cascade: 'all'
    }
    String meetingVenue
    Date meetingDate = new Date()
    String meetingTime
    long CREATED_BY=0
    Date CREATED_DATE=new Date()
    long UPDATED_BY=0
    Date UPDATED_DATE=new Date()
    static hasMany = [entryMeetingDetails: AdtEntryMeetingDetails]
    static constraints = {
        meetingVenue(nullable: false, blank: false)
        meetingDate(nullable: false)
        meetingTime(nullable: false, blank: false)
        CREATED_BY(nullable:true)
        CREATED_DATE(nullable:true)
        UPDATED_BY(nullable: true)
        UPDATED_DATE(nullable: true)
    }
    String toString(){
        return id
    }
}

我的 child 域 >>>

class AdtEntryMeetingDetails {
    static mapping = {
        table('ADT_ENTRY_MEETING_DETAILS')
        version(false)
    }
    AuditFirm auditPack
    AuditorDtl auditor
    String meetingSubject
    String responsiblePerson
    AdtEntryMeeting entryMeeting
    static constraints = {
        auditPack(nullable: false, blank: false)
        auditor(nullable: false, blank: false)
        meetingSubject(nullable: false, blank: false)
        responsiblePerson(nullable: false, blank: false)
        entryMeeting(nullable: false, blank: false)
    }
    String toString(){
        return auditPack
    }
}

我要删除的操作>>>

if(params[isDelete + detailsCounter] == 'delete'){
                def entryMeetingDetailsDelete = AdtEntryMeetingDetails.get(Long.parseLong(params[entryMeetingDetailsId + detailsCounter]))
                entryMeetingDetailsDelete.delete()
            }else{
                def entryMeetingDetailsEdit = AdtEntryMeetingDetails.get(Long.parseLong(params[entryMeetingDetailsId + detailsCounter]))
                entryMeetingDetailsEdit.properties['auditPack'] = AuditFirm.get(Long.parseLong(params[auditPack + detailsCounter]))
                entryMeetingDetailsEdit.properties['auditor'] = AuditorDtl.get(Long.parseLong(params[auditor + detailsCounter]))
                entryMeetingDetailsEdit.properties['meetingSubject'] = params[meetingSubject + detailsCounter]
                entryMeetingDetailsEdit.properties['responsiblePerson'] = params[responsiblePerson + detailsCounter]
                adtEntryMeetingInstance.addToEntryMeetingDetails(entryMeetingDetailsEdit)
            }

我遇到的错误 >>>

deleted object would be re-saved by cascade (remove deleted object from associations)

Answer 1

您应该先从父项中删除引用，然后再删除子项

例如

def entryMeetingDetailsDelete = AdtEntryMeetingDetails.get(Long.parseLong(params[entryMeetingDetailsId + detailsCounter]))

adtEntryMeetingInstance.removeFromAdtEntryMeetingDetails(entryMeetingDetailsDelete)
 entryMeetingDetailsDelete.delete()

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