ModelMapper - 在具有该属性的关系的实体中映射 DTO 的属性 [英] ModelMapper - Map a DTO's property inside an Entity that has a Relationship that has this property

问题描述

早上好

我正在使用 ModelMapper 将 DTO 映射到实体，反之亦然，对此我有一个问题.

I am using the ModelMapper to map the DTOs to the Entities and vice versa and related to this I have one question.

1) 当我从 SonController 获取 SonDTO 时，我需要将长的 MotherId 映射到实体 Son，但在那里我有实体 Mother Mother 建立关系，并且内部具有 id.那么我如何将这个 SonDTO MotherId 映射到实体 Mother Mother，反之亦然?

1) When I'm getting SonDTO from SonController, I need to map the long motherId to Entity Son, but there I have the Entity Mother mother making the relationship and that has the id internally. So how do I map this SonDTO motherId into the Entity Mother mother and vice versa?

在类下面:

class SonDTO {
    long id;
    String name;
    int age;
    long motherId;
}

class MotherDTO{
    long id;
    String name;
    int age;
    List<Long> sonsId;
    List<String> sonsName;
}

@Entity
class Mother{

   @Id
   @GeneratedValue(strategy=GenerationType.IDENTITY)
   private Long id;

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

   @Column(name = "age")
   private int age;

   @OneToMany(mappedBy = "mother", cascade = CascadeType.ALL, fetch = FetchType.LAZY, orphanRemoval = true)
   List<Son> sons;

}

@Entity
class Son{

   @Id
   @GeneratedValue(strategy=GenerationType.IDENTITY)
   private Long id;

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

   @Column(name = "age")
   private int age;

   @ManyToOne(fetch = FetchType.LAZY)
   @JoinColumn(name = "mother_id")
   private Mother mother;
}

推荐答案

您可以为实体使用 PropertyMap 并将其添加到 ModelMapper.

You can use a PropertyMap for your entity and add it to the ModelMapper.

PropertyMap<Mother, MotherDTO> motherMap = new PropertyMap<Mother, MotherDTO>() {
     protected void configure() {
         map().setSonsId(source.getSons()...//here is your choice of coding
         // you can either use streams or simple for loops to transform the
         // entity into a List<Long> 
         );
         //other attributes here
     }
};

最终:

modelMapper.addMappings(motherMap);

您不必为 SonDTO 对象创建映射，因为 modelMapper 正在查看您的属性名称并使用默认匹配策略和 SonDTO属性名称足以不使用其他策略并匹配正确的源 (Son) 属性.

You don't have to create a mapping for the SonDTO object because the modelMapper is looking through your attributes' name and uses a default matching strategy and SonDTO's attributes name are just enough to not use another strategies and match the correct source (Son) attributes.

链接:

1) 匹配过程(非常重要):这里

2) 匹配策略(非常重要):这里

3) 示例(重要):此处.(请注意这里的属性命名.)

3) Example (important) : here. (Please pay attention here at the attribute naming.)

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