Question

class Candidate  {
    String username;
    static HasMany=[applications:Application]
}

class Vote {
   String name;
   Date firstdate;
   Date enddate ;
   static HAsMany=[applications:Application]
}



  class Application {
        Date datedemand;
        Candidate candidate; 
        Vote vote;
   static belongsTo = [candidate:Candidate,vote:Vote]
    }

我想显示投票列表，如果点击投票，则会显示此投票的候选人名单。
我开始了以下尝试，我仍然被阻止：

def candidatsGrpByVte(){
    def results = Application.withCriteria {
    createAlias("vote", "vote")
        projections {
            groupProperty("vote.name") 
        }
    }
}

    def candidatesByVName(def vname){
        def results= Application.createCriteria().list() {
            createAlias("candidate","candidatAlias")
            createAlias("vote","voteAlias")
            eq('voteAlias.name',vname)
            projections {
               property('candidatAlias.username')
            }
        }
        return results;
    }

我想在申请表中看到候选人我如何在视图中显示。
你能给我一个想法吗？

Answer 1

映射看起来很复杂。 Vote与Candidate没有直接关系，您希望每次投票都列出候选人。

Vote与Candidate相关的唯一方式是Application。因此，您必须获取Application的{{1}}并显示Vote的所有Candidate。

Application

//Lazily:- def voteCandidature = [:] Vote.list()?.each{vote-> voteCandidature << [(vote.name) : vote.application?.candidate?.asList()] } //Eagerly:- def candidatesByVote(){ def results = Application.createCriteria().list{ vote{ } candidate{ } } } results.each{application-> def votes = application.vote def candidates = application.candidate //Lost after this //You have bunch of votes and bunch of candidates //but both belong to the same application }实际上是什么意思？您能否详细说明每个使用的域类，主要是Vote和Vote？为什么不为Application使用复数？

Grails：在Controller和View中使用列表

1 个答案: