使用MapStruct将Dto转换为实体会出错

Question

我试图使用MapStruct创建一个“PersondTo”类到“PersonEntity”的映射器

package com.example.car;

import java.util.ArrayList;
import java.util.List;

public class PersonEntity {
    private String name;
    private List<CarEntity> cars;

    public PersonEntity() {
        cars = new ArrayList<>();
    }

    public boolean addCar(CarEntity carEntitiy) {
        return cars.add(carEntitiy);
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<CarEntity> getCars() {
        return cars;
    }

    public void setCars(List<CarEntity> carEntities) {
        this.cars = carEntities;
    }
}

package com.example.car;

public class CarEntity {
    private String model;

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }
}

package com.example.car;

import java.util.ArrayList;
import java.util.List;

public class PersonDto {
    private String name;
    private List<CarDto> cars;

    public PersonDto() {
        cars = new ArrayList<>();
    }

    public boolean addCar(CarDto carDto) {
        return cars.add(carDto);
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<CarDto> getCars() {
        return cars;
    }

    public void setCars(List<CarDto> carDtos) {
        this.cars = carDtos;
    }
}

package com.example.car;

public class CarDto {
    private String model;

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }
}

package com.example.car;

import org.mapstruct.CollectionMappingStrategy;
import org.mapstruct.Mapper;
import org.mapstruct.factory.Mappers;

@Mapper(collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED)
public interface PersonMapper {

    PersonMapper INSTANCE = Mappers.getMapper(PersonMapper.class);

    PersonEntity personDtoToPersonEntity(PersonDto personDto);
}

无法将属性“java.util.List Cars”映射到“com.example.car.CarEntity Cars”。考虑声明/实现一个映射方法：“com.example.car.carEntity map（java.util.List value）”。

如果我从Person类中删除“加法器”方法，它工作得很好。但是我真的想使用加法器方法（用于JPA实体、父子关系）。

我不知道为什么MapStruct不将PersonEntity中的cars属性解释为List。它将该属性解释为一个简单的CarEntity，而不是CarEntity的列表。

Answer 1

您也应该考虑映射类的“havs-a”属性
只包含CarEntity carDtoToCarEntity（CarDto CarDto)
这里是代码片段:

@Mapper(collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED)
public interface PersonMapper {
    PersonMapper INSTANCE = Mappers.getMapper(PersonMapper.class);
    CarEntity carDtoToCarEntity(CarDto carDto); 
    PersonEntity personDtoToPersonEntity(PersonDto personDto);

}

如果您仍然被困，请告诉我。