前言
今天在使用jpa中的级联保存时,发现报
            
            
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          A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance;原因分析
其原因User实体类有个字段
 其关联表为
 其关联表为
            
            
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          @Entity
@Table(name = "sys_user_client_type")
@Data
@FieldNameConstants
public class UserClientType extends FullAuditedEntity {
    private static final long serialVersionUID= -1;
    /**
     * 客户端类型
     */
    @Enumerated(EnumType.STRING)
    private ClientTypeEnum clientType;
    /**
     * 用户
     */
    @ManyToOne(optional = false, targetEntity=User.class)
    @JoinColumn(name = "user_id", referencedColumnName = BaseEntity.Fields.id)
    private User user;
}在使用User更新级联的时候
            
            
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          if (CollectionUtils.isNotEmpty(createOrUpdateUserInput.getUserClientTypes())) {
    List<UserClientType> userClientTypeList = createOrUpdateUserInput.getUserClientTypes().stream()
            .distinct()
            .map(e -> {
                UserClientType userClientType = new UserClientType();
                userClientType.setClientType(e);
                userClientType.setUser(user);
                return userClientType;
            }).collect(Collectors.toList());
    user.setClientTypes(userClientTypeList);
}报错,也就是说,更新该字段时不能使用setClientTypes(),需要使用set类的add或者addAll方法进行更新。
            
            
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          // 设置clientType
List<ClientTypeEnum> clientTypeEnums = createOrUpdateUserInput.getUserClientTypes();
if (clientTypeEnums != null) {
    List<UserClientType> userClientTypes = clientTypeEnums.stream().map(t -> {
        UserClientType clientType = new UserClientType();
        clientType.setClientType(t);
        clientType.setUser(user);
        return clientType;
    }).collect(Collectors.toList());
    user.getClientTypes().clear();
    user.getClientTypes().addAll(userClientTypes);