@MapStruct。源参数中不存在名为“packaging”的属性

Question

我正在用Spring Boot和Hibernate编写一个MVCREST应用程序。我决定使用Mapstruct进行DTO映射。似乎我按照指南做了一切，但发出了一个错误。问题出在哪里，我不明白。论坛和谷歌上的信息很少。

附言。起初，我认为问题出在Lombok上，所以我删除了Lombok并手动分配了getters/setters。然后问题没有解决。我在drine类和drinkdto中都使用了这两个类，我规定了getters/setters。还是无济于事。

饮料：

@Entity
@Table(name = "drink", schema = "public")
public class Drink {

    public Drink() { // Constructor for Hibernate

    }


    // Fields
    //
    private @Id
    @GeneratedValue
    Long id;

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

    @Column(name = "price")
    private float price;

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

    @Column(name = "is_deleted")
    private boolean isDeleted;

    // Relationships
    //
    @ManyToOne
    @JoinColumn(name = "packaging_id")
    private Packaging packaging;

    @ManyToOne
    @JoinColumn(name = "manufacturer_id")
    private Manufacturer manufacturer;

    @ManyToOne
    @JoinColumn(name = "country_id")
    private Countries countries;
}

public class DrinkDTO {

    // Fields
    //
    private String drinkName;

    private float drinkPrice;

    private String drinkAbout;

    private Packaging drinkPackaging;

    private Manufacturer drinkManufacturer;

    private Countries drinkCountries;


    // Getters and Setters
    //
    public String getDrinkName() {
        return drinkName;
    }

    public void setDrinkName(String drinkName) {
        this.drinkName = drinkName;
    }

    public float getDrinkPrice() {
        return drinkPrice;
    }

    public void setDrinkPrice(float drinkPrice) {
        this.drinkPrice = drinkPrice;
    }

    public String getDrinkAbout() {
        return drinkAbout;
    }

    public void setDrinkAbout(String drinkAbout) {
        this.drinkAbout = drinkAbout;
    }

    public Packaging getDrinkPackaging() {
        return drinkPackaging;
    }

    public void setDrinkPackaging(Packaging drinkPackaging) {
        this.drinkPackaging = drinkPackaging;
    }

    public Manufacturer getDrinkManufacturer() {
        return drinkManufacturer;
    }

    public void setDrinkManufacturer(Manufacturer drinkManufacturer) {
        this.drinkManufacturer = drinkManufacturer;
    }

    public Countries getDrinkCountries() {
        return drinkCountries;
    }

    public void setDrinkCountries(Countries drinkCountries) {
        this.drinkCountries = drinkCountries;
    }

    // toSTRING
    @Override
    public String toString() {
        return "DrinkDTO{" +
                "drinkName='" + drinkName + '\'' +
                ", drinkPrice=" + drinkPrice +
                ", drinkAbout='" + drinkAbout + '\'' +
                ", drinkPackaging=" + drinkPackaging +
                ", drinkManufacturer=" + drinkManufacturer +
                ", drinkCountries=" + drinkCountries +
                '}';
    }

@GetMapping("/drinks")
    List<DrinkDTO> getAllDrinks(){
        return DrinkMapper.INSTANCE.drinksToDrinksDTO(customerService.getAllDrinks());
    }

Build.Gradle

// Mapstruct
    implementation 'org.mapstruct:mapstruct:1.3.1.Final'
    annotationProcessor 'org.mapstruct:mapstruct-processor:1.3.1.Final'

DrinkMapper：

@Mapper
public interface DrinkMapper {

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

    @Mapping(source = "name", target = "drinkName")
    @Mapping(source = "price", target = "drinkPrice")
    @Mapping(source = "about", target = "drinkAbout")
    @Mapping(source = "packaging", target = "drinkPackaging")
    @Mapping(source = "manufacturer", target = "drinkManufacturer")
    @Mapping(source = "countries", target = "drinkCountries")
    DrinkDTO drinkToDrinkDTO(Drink drink);

    @Mapping(source = "drinkName", target = "name")
    @Mapping(source = "drinkPrice", target = "price")
    @Mapping(source = "drinkAbout", target = "about")
    @Mapping(source = "drinkPackaging", target = "packaging")
    @Mapping(source = "manufacturer", target = "drinkManufacturer")
    @Mapping(source = "countries", target = "drinkCountries")
    Drink drinkDTOtoDrink(DrinkDTO drinkDTO);

    @Mapping(source = "name", target = "drinkName")
    @Mapping(source = "price", target = "drinkPrice")
    @Mapping(source = "about", target = "drinkAbout")
    @Mapping(source = "packaging", target = "drinkPackaging")
    @Mapping(source = "manufacturer", target = "drinkManufacturer")
    @Mapping(source = "countries", target = "drinkCountries")
    List<DrinkDTO> drinksToDrinksDTO(List<Drink> drinks);
}




Answer 1

该错误来自这样一个事实，即您试图从列表<>对象映射属性，但这些对象不存在。只要Mapstruct知道如何映射列表中的元素，Mapstruct就足够聪明，可以在列表之间生成映射器。

因此，您不需要在列表到列表的映射上指定@mapping注释。Mapstruct将自动使用DrinkToDrinkDto映射方法。

@Mapping(...)
DrinkDTO drinkToDrinkDTO(Drink drink);

List<DrinkDTO> drinksToDrinksDTO(List<Drink> drinks);