Grails removeFrom()问题
在我的申请者域类中,我有以下内容:Grails removeFrom()问题,grails,gorm,Grails,Gorm,在我的申请者域类中,我有以下内容: static hasMany = [recommendationFiles:ApplicantFile] static mapping = {recommendationFiles joinTable: [name:"LETTER_FILES", key: "APPLICANT_ID", column: "LETTER_ID"]} def applicant = Applicant.findByENumber(session.user.eNumber
static hasMany = [recommendationFiles:ApplicantFile]
static mapping = {recommendationFiles joinTable: [name:"LETTER_FILES", key: "APPLICANT_ID", column: "LETTER_ID"]}
def applicant = Applicant.findByENumber(session.user.eNumber)
def applicantFiles = applicant.recommendationFiles
println applicantFiles
applicantFiles.each {
applicant.removeFromRecommendationFiles(it)
}
applicant.save(flush:true)
当我执行以下操作时:
static hasMany = [recommendationFiles:ApplicantFile]
static mapping = {recommendationFiles joinTable: [name:"LETTER_FILES", key: "APPLICANT_ID", column: "LETTER_ID"]}
def applicant = Applicant.findByENumber(session.user.eNumber)
def applicantFiles = applicant.recommendationFiles
println applicantFiles
applicantFiles.each {
applicant.removeFromRecommendationFiles(it)
}
applicant.save(flush:true)
我认为这是一个错误,对我来说毫无意义:
| Error 2015-04-08 10:41:59,570 [http-bio-8080-exec-10] ERROR errors.GrailsExceptionResolver - ConcurrentModificationException occurred when processi
ng request: [POST] /scholarshipsystem/specialized/index - parameters:
_action_reUpload: Re-Upload
Stacktrace follows:
Message: null
Line | Method
->> 793 | nextEntry in java.util.HashMap$HashIterator
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 828 | next in java.util.HashMap$KeyIterator
| 106 | reUpload in scholarshipSystem.SpecializedController$$EP9HMKbd
| 195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter
| 63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
| 895 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 918 | run . . . in ''
^ 662 | run in java.lang.Thread
有几种方法可以实现这一点。一种方法是将列表转换为数组并对其进行迭代
def list = applicantFiles.toArray()
list.each {
applicant.removeFromRecommendationFiles(it)
}
另一种方式,如果你只是删除整个集合将是
applicant.recommendationFiles*.delete()
applicant.recommendationFiles.clear()
您正在从您正在迭代的同一个列表中删除,我如何才能在不迭代它们并对每个列表执行removeFrom的情况下删除它们?第二种方法正是我需要做的。非常感谢你!