Mysql 使用JPA在Spring中使用removeAll更新对象集

我有一个提案对象，它有一组投票。一个用户拥有一定数量的投票权（比如说，100票将分配给不同的提案）。提案有一个atribute类型，允许用户投票支持它。在研究中，提案可以修改，但不能表决。获得批准后，可以对其进行投票，但当该属性更改为“开发”时，必须从数据库中清除所有投票，并且已将其100票用于已批准提案的用户可以将其取回并投票给另一个提案

我可以创建一个提案，我的控制器可以向提案中添加一个投票，这些投票将显示在数据库中。问题来了，当我改变阿曲布他类型的发展。此时，我可以从DB获取提案，将其发送到proposal.deleteVote（）方法，移除所有投票，以（null）投票返回提案，但当我将提案保存在数据库中时，它不会更新。从集合中删除的投票记录仍然存在

@Entity
@Table(name="proposal")
public class Proposal {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name="id")
private Long id;

@Column(name="functionality")
private String functionality;

@ManyToOne
@JoinColumn(name="siteuserid")
private SiteUser siteUser;

@ManyToOne              
@JoinColumn(name = "statusupdateid")
private StatusUpdate statusUpdate;

@OneToMany(mappedBy="proposal", cascade=CascadeType.ALL)
private Set<Vote> votes;

@Column(name="releasedate")
@DateTimeFormat(pattern="yyyy/MM/dd")
private Date release;

@Column(name="proposal_type")
@Enumerated(EnumType.STRING)
private ProposalType proposalType;

@Transient
private int proposalVotes;

public Proposal() {
}

// CONSTRUCTORS GETTER AND SETTERS

public Set<Vote> getVotes() {
    return votes;
}

public void setVotes(Set<Vote> votes) {
    this.votes = votes;
}

public void addVote(Vote vote){
    votes.add(vote);
}

public Proposal deleteVote(Proposal proposal){

    HashSet <Vote> thevotes = new HashSet<Vote>();

    thevotes.removeAll(proposal.getVotes());

    return proposal;    
}

public int getProposalVotes() {
    return proposalVotes;
}

public void setProposalVotes(int proposalVotes) {
    this.proposalVotes = proposalVotes;
}

proposalService在这里。提案未经表决即通过（空） 但它不会在数据库中更新（没有给出错误）。我不知道为什么会这样

    public void createProposal(Proposal proposal){
    System.out.println("!!!! ProposalService + createProposal .... " +proposal);
    proposalDao.save(proposal);
}

投票实体在这里：

package com.caveofprogramming.model.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="votes")
public class Vote {

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="id")
private Long id;

@ManyToOne
@JoinColumn(name="siteuserid")
private SiteUser siteUser;

@ManyToOne                     
private Proposal proposal;

@Column(name="points")
private int numberOfPoints;

public Vote() {
}

public Vote(Long id, SiteUser siteUser, Proposal proposal, int numberOfPoints) {
    this.id = id;
    this.siteUser = siteUser;
    this.proposal = proposal;
    this.numberOfPoints = numberOfPoints;
}

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public SiteUser getSiteUser() {
    return siteUser;
}

public void setSiteUser(SiteUser siteUser) {
    this.siteUser = siteUser;
}

public Proposal getProposal() {
    return proposal;
}

public void setProposal(Proposal proposal) {
    this.proposal = proposal;
}

public int getNumberOfPoints() {
    return numberOfPoints;
}

public void setNumberOfPoints(int numberOfPoints) {
    this.numberOfPoints = numberOfPoints;
}

@Override
public String toString() {
    return "Vote [id=" + id + ", numberOfPoints=" + numberOfPoints + "]";
}

---

}

你能分享你的完全控制者方法和投票实体吗？@Amer Qarabsa完成，但另一个编辑被拒绝。你现在能看到吗？看看你的公共删除投票（提案）方法。这没有任何意义。它创建一个新的空哈希集，然后从这个空哈希集中删除内容。更不用说它是一种提案方法，它将另一个提案作为参数，并返回该提案。。。调用方已经知道了，因为它只是将其作为参数。即使它确实从提案的投票中删除了投票，它也不会修改协会的所有者方（即将投票提案设置为空），因此JPA不会在意。

package com.caveofprogramming.model.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="votes")
public class Vote {

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="id")
private Long id;

@ManyToOne
@JoinColumn(name="siteuserid")
private SiteUser siteUser;

@ManyToOne                     
private Proposal proposal;

@Column(name="points")
private int numberOfPoints;

public Vote() {
}

public Vote(Long id, SiteUser siteUser, Proposal proposal, int numberOfPoints) {
    this.id = id;
    this.siteUser = siteUser;
    this.proposal = proposal;
    this.numberOfPoints = numberOfPoints;
}

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public SiteUser getSiteUser() {
    return siteUser;
}

public void setSiteUser(SiteUser siteUser) {
    this.siteUser = siteUser;
}

public Proposal getProposal() {
    return proposal;
}

public void setProposal(Proposal proposal) {
    this.proposal = proposal;
}

public int getNumberOfPoints() {
    return numberOfPoints;
}

public void setNumberOfPoints(int numberOfPoints) {
    this.numberOfPoints = numberOfPoints;
}

@Override
public String toString() {
    return "Vote [id=" + id + ", numberOfPoints=" + numberOfPoints + "]";
}