java - 如何将 DTO 中的 ID 映射到实体上的类的 ID

Question

我正在尝试从具有 int 产品 ID 的 ProductReviewDTO 映射以链接到在 ProductReview 实体上找到的产品。但是使用 ModelMapper 似乎无法正确映射。导致设置值失败错误消息以及 IllegalArgument 异常，说明在尝试设置值时对象不是声明类的实例。

ProductReview 到 ProductReviewDTO 的第一个映射工作正常。

DTO：

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class ProductReviewDTO {

    private int id;
    private int productId;
}

实体：

@Data
@Entity
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Table(name = "product_reviews")
public class ProductReview {

    @Id
    @SequenceGenerator(name="product_reviews_generator", sequenceName = "product_reviews_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "product_reviews_generator")
    @Column(name = "id", updatable = false, nullable = false)
    private int id;

    @ManyToOne(cascade=CascadeType.DETACH, fetch = FetchType.LAZY)
    @JoinColumn(name = "product_id", nullable=false)
    private Product product;
}

映射：

@NoArgsConstructor
public class ProductReviewMapping implements BaseMapping<ProductReview, ProductReviewDTO> {

    @Override
    public PropertyMap<ProductReview, ProductReviewDTO> MapFromSourceToTarget() {
        return new PropertyMap<ProductReview, ProductReviewDTO>() {
            protected void configure() {
                map().setProductId(source.getProduct().getId());
                map().setUserId(source.getUser().getId());
                map().setRatingId(source.getRating().getId());
            }
        };
    }

    @Override
    public PropertyMap<ProductReviewDTO, ProductReview> MapFromTargetToSource() {
        return new PropertyMap<ProductReviewDTO, ProductReview>() {
            protected void configure() {
                map().setProduct(new Product().builder().id(source.getProductId()).build());
            }
        };
    }
}

Caused by: org.modelmapper.MappingException: ModelMapper mapping errors:

1) Failed to set value '1' on com.pfex.ecom.library.common.entity.Product$ProductBuilder.id()

标签： javamodelmapper