英文:
ModelMapper - failed to convert org.hibernate.collection.internal.PersistentBag to java.util.ArrayList
问题
// ModelMapper配置示例：compile group: 'org.modelmapper', name: 'modelmapper', version: '2.3.8'// 目前我有以下配置：modelMapper = new ModelMapper();modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STANDARD).setFieldMatchingEnabled(true).setFieldAccessLevel(Configuration.AccessLevel.PRIVATE);// 我的实体类：@OneToMany(mappedBy = "employee", cascade = CascadeType.ALL, orphanRemoval = true)private List<Phones> phones = new ArrayList<>();// 我的第二个实体类：@ManyToOne@JoinColumn(name = "employee_id")private Employee employee;// 我想要的DTO类：@Data@Builder@AllArgsConstructor@NoArgsConstructor(force = true)public class EmployeeDTO {@Singularprivate final List<PhoneDTO> phones;}// 我是这样进行映射的：EmployeeDTO.EmployeeDTOBuilder employeeDTOBuilder =ObjectMapperUtils.map(employee, EmployeeDTO.EmployeeDTOBuilder.class);// 我得到了以下错误：1) 转换器 org.modelmapper.internal.converter.MergingCollectionConverter@969b4391 无法将 org.hibernate.collection.internal.PersistentBag 转换为 java.util.ArrayList。
英文:
How should ModelMapper configuration looks like?
compile group: 'org.modelmapper', name: 'modelmapper', version: '2.3.8'
Currently I have:
modelMapper = new ModelMapper();modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STANDARD).setFieldMatchingEnabled(true).setFieldAccessLevel(Configuration.AccessLevel.PRIVATE);
My Entity has
@OneToMany(mappedBy = "employee", cascade = CascadeType.ALL, orphanRemoval = true)private List<Phones> phones = new ArrayList<>();
My second entity:
@ManyToOne@JoinColumn(name = "employee_id")private Employee employee;
My DTO which I want to have:
@Data@Builder@AllArgsConstructor@NoArgsConstructor(force = true)public class EmployeeDTO {@Singularprivate final List<PhoneDTO> phones;}
I am mapping this in this way:
EmployeeDTO.EmployeeDTOBuilder employeeDTOBuilder= ObjectMapperUtils.map(employee, EmployeeDTO.employeeDTOBuilder.class);
I'm getting:
- Converter org.modelmapper.internal.converter.MergingCollectionConverter@969b4391 failed to convert org.hibernate.collection.internal.PersistentBag to java.util.ArrayList.
答案1
得分: 1
深入查看堆栈跟踪：最后的映射问题通常是可操作性更强的内容。
也许 PhoneDTO 无法映射？如果是这样，您需要创建一个转换器，并告诉模型映射器，像这样：
public class PhoneConverter extends AbstractConverter<PhoneEntity, PhoneDto>{private final StrictModelMapper strictModelMapper;@Overridepublic PhoneDto convert(@NonNull final PhoneEntity source){PhoneDto phoneDto = new PhoneDto();strictModelMapper.map(source, phoneDto);return phoneDto;}}
然后将其添加到 modelMapper 中。
英文:
Look a bit deeper in the stack trace: the last mapping problem is often something more actionable.
Maybe the PhoneDTO was not mappable ? If so, you need to create a converter and tell model mapper about it, like so:
public class PhoneConverter extends AbstractConverter<PhoneEntity, PhoneDto>{private final StrictModelMapper strictModelMapper;@Overridepublic PhoneDto convert(@NonNull final PhoneEntity source){PhoneDto phoneDto = new PhoneDto();strictModelMapper.map(source, phoneDto);return phoneDto;}}
and add it to the modelMapper.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论