java的mapstruct 1.3.1在双向DTO映射列表忽略属性

268

约翰学生：

我与循环依赖问题MapStruct挣扎。我一直有一个计算器错误由于循环依赖。为了避免它，我只需要排除列表的属性。我发现这一点：https://github.com/mapstruct/mapstruct/issues/933我深深的看了在互联网上，我一直感到惊讶，我找不到任何充分为例展示与MapStruct双向DTO映射（除使用@Context CycleAvoidingMappingContext，不工作对我来说）。

[编辑]：我发现了一个workarround感谢MapStruct聊天，我把它添加到 EditorMapper

这里是我的情况下，非常常见的我想：我有2个DTO的引用对方：

public class BookDTO {

    private Long id;

    private String title;

        //... other properties

    //@JsonManagedReference --> not necessary anymore
    private EditorDTO editor;
}

public class EditorDTO {

    private Long id;
    private String name;

        //...other properties

    //@JsonBackReference --> not necessary anymore
    private List< BookDTO > bookList;
}

我需要MapStruct能够在编辑器中的书目排除属性编辑器，然后避免无限循环。这是我目前拥有的映射器：

@Mapper
public interface BookMapper {

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

    @Mapping( target = "editor.bookList", ignore = true)
    BookDTO toDTO( BookEntity bookEntity );

    @Named( "NoEditor" )
    @Mapping(target = "editor", ignore = true)
    BookDTO toDTONoEditor( BookEntity bookEntity );

    List<BookDTO> toDTOList( List<BookEntity> bookEntityList );

    @Named( "NoEditor" )
    @IterableMapping(qualifiedByName="NoEditor")
    List<BookDTO> toDTOListNoEditor( List<BookEntity> bookEntityList );

    @Mapping( target = "editor.bookList", ignore = true)
    BookEntity toEntity( BookDTO bookDTO );

    List<BookEntity> toEntityList( List<BookDTO> bookDTOList );
}

@Mapper(uses = BookMapper.class)
public interface EditorMapper {

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

    @Named( "NoEditor" )
    @Mapping(target = "bookList", qualifiedByName = "NoEditor")
    EditorDTO toDTO( EditorEntity editorEntity );

    @Named( "NoEditor" )
    @IterableMapping(qualifiedByName="NoEditor")
    List<EditorDTO> toDTOList( List< EditorEntity > editorEntityList );

    EditorEntity toEntity( EditorDTO editorDTO );

    List<EditorEntity> toEntityList( List< EditorDTO > editorDTOList );
}

[编辑]：现在的作品，但它不是100％干净（请参阅下面我发布更多细节的答案）

我也试过这种方法在映射器，但它并没有对我的PB任何影响。

BookDTO toDTO( BookEntity bookEntity, @Context CycleAvoidingMappingContext context );

有谁知道我做错了吗？非常感谢！:)

约翰学生：

[编辑]：我也添加了解决方案双向多对多映射感谢https://gitter.im/mapstruct/mapstruct-users#，我已经能够得到解决。我必须： -添加usesattribut到EditorMapper：@Mapper(componentModel = "spring", uses = BookMapper.class)-添加的替代方法，如toDTONoEditor或toDTOListNoEditor在BookMapper那里我忽略了editor财产。-图论文在替代方法EditorMapper-同为每个循环依赖

这里是解决方案：

BookDTO

public class BookDTO {

    private Long id;

    private String title;

        //... other properties

    private EditorDTO editor;
    private List< CategoryDTO > categoryList;
}

EditorDTO

public class EditorDTO {

    private Long id;
    private String name;

        //...other properties

    private List< BookDTO > bookList;
}

CategoryDTO

public class CategoryDTO {

    private Long id;

    private String category;

    private List< BookDTO > bookList;
}

BookMapper

@Mapper(componentModel = "spring", uses = CategoryMapper.class)
public interface BookMapper {


    @Named( "NoBook" )
    @Mappings( {
            @Mapping(target = "categoryList", qualifiedByName = "NoBook"),
            @Mapping( target = "editor.bookList", ignore = true)
    } )
    BookDTO toDTO( BookEntity bookEntity );

    @Named( "NoEditor" )
    @Mapping(target = "editor", ignore = true)
    BookDTO toDTONoEditor( BookEntity bookEntity );

    @Named( "NoCategory" )
    @Mapping(target = "categoryList", ignore = true)
    BookDTO toDTONoCategory( BookEntity bookEntity );


    @Named( "NoBook" )
    @IterableMapping(qualifiedByName="NoBook")
    List<BookDTO> toDTOList( List<BookEntity> bookEntityList );

    @Named( "NoCategory" )
    @IterableMapping(qualifiedByName="NoCategory")
    List<BookDTO> toDTOListNoCategory( List<BookEntity> bookEntityList );

    @Named( "NoEditor" )
    @IterableMapping(qualifiedByName="NoEditor")
    List<BookDTO> toDTOListNoEditor( List<BookEntity> bookEntityList );


    @Named( "NoBook" )
    @Mappings( {
            @Mapping(target = "categoryList", qualifiedByName = "NoBook"),
            @Mapping( target = "editor.bookList", ignore = true)
    } )
    BookEntity toEntity( BookDTO bookDTO );

    @Named( "NoCategory" )
    @Mapping(target = "categoryList", ignore = true)
    BookEntity toEntityNoCategory( BookDTO bookDTO );


    @Named( "NoBook" )
    @IterableMapping(qualifiedByName="NoBook")
    List<BookEntity> toEntityList( List<BookDTO> bookDTOList );

    @Named( "NoCategory" )
    @IterableMapping(qualifiedByName="NoCategory")
    List<BookEntity> toEntityListNoCategory( List<BookDTO> bookDTOList );
}

EditorMapper

@Mapper(componentModel = "spring", uses = BookMapper.class)
public interface EditorMapper {

    @Named( "NoEditor" )
    @Mapping(target = "bookList", qualifiedByName = "NoEditor")
    EditorDTO toDTO( EditorEntity editorEntity );

    @Named( "NoCategory" )
    @Mapping(target = "bookList", ignore = true)
    EditorDTO toDTONoBook( EditorEntity editorEntity );


    @Named( "NoEditor" )
    @IterableMapping(qualifiedByName="NoEditor")
    List<EditorDTO> toDTOList( List< EditorEntity > editorEntityList );

    @Named( "NoCategory" )
    @IterableMapping(qualifiedByName="NoCategory")
    List<EditorDTO> toDTOListNoCategory( List< EditorEntity > editorEntityList );


    EditorEntity toEntity( EditorDTO editorDTO );

    List<EditorEntity> toEntityList( List< EditorDTO > editorDTOList );
}

CategoryMapper

@Mapper(componentModel = "spring",uses = BookMapper.class)
public interface CategoryMapper {


    @Named( "NoCategory" )
    @Mapping(target = "bookList", qualifiedByName = "NoCategory")
    CategoryDTO toDTO( CategoryEntity categoryEntity );

    @Named( "NoBook" )
    @Mapping(target = "bookList", ignore = true)
    CategoryDTO toDTONoBook( CategoryEntity categoryEntity );


    @Named( "NoCategory" )
    @IterableMapping(qualifiedByName="NoCategory")
    List<CategoryDTO> toDTOList( List< CategoryEntity > categoryEntityList );

    @Named( "NoBook" )
    @IterableMapping(qualifiedByName="NoBook")
    List<CategoryDTO> toDTOListNoBook( List< CategoryEntity > categoryEntityList );


    @Named( "NoCategory" )
    @Mapping(target = "bookList", qualifiedByName = "NoCategory")
    CategoryEntity toEntity( CategoryDTO categoryDTO );

    @Named( "NoBook" )
    @Mapping(target = "bookList", ignore = true)
    CategoryEntity toEntityNoBook( CategoryDTO categoryDTO );


    List<CategoryEntity> toEntityList( List< CategoryDTO > categoryDTOList );

    @Named( "NoBook" )
    @IterableMapping(qualifiedByName="NoBook")
    List<CategoryEntity> toEntityListNoBook( List< CategoryDTO > categoryDTOList );

}

通过这种方式，它涉及到无限循环之前的循环依赖被破坏。然而，它是满足99％，因为Editor和Book对象不是完全干净。Editor包含书目，很好。但是每本书中bookList还包含一个空editor场。而反之为Book对象。但它似乎是一个德/序列化的问题，而不是一个MapStruct一个。以下是将JSON由此而来

编辑

{
  "id": 1,
  "name": "Folio",
  "coordinates": null,
  "bookList": [
    {
      "id": 1,
      "title": "Le cycle de Fondation, I : Fondation",
      "categoryList": [
        {
          "id": 5,
          "category": "LITERATURE&FICTION"
        }
      ],
      "language": "French",
      "isbn": 2070360539,
      "publicationDate": null,
      "numberOfPages": 416,
      "authorList": [],
      "libraryList": [
        {
          "id": 2,
          "name": "Library2",
          "coordinates": null
        },
        {
          "id": 1,
          "name": "Library1",
          "coordinates": null
        }
      ],
      "editor": null
    }
  ]
}

书

{
  "id": 1,
  "title": "Le cycle de Fondation, I : Fondation",
  "categoryList": [
    {
      "id": 5,
      "category": "LITERATURE&FICTION",
      "bookList": null
    }
  ],
  "language": "French",
  "isbn": 2070360539,
  "publicationDate": null,
  "numberOfPages": 416,
  "authorList": [],
  "libraryList": [
    {
      "id": 2,
      "name": "Library2",
      "coordinates": null
    },
    {
      "id": 1,
      "name": "Library1",
      "coordinates": null
    }
  ],
  "editor": {
    "id": 1,
    "name": "Folio",
    "coordinates": null,
    "bookList": null
  }
}

类别

{
  "id": 1,
  "category": "CHILDREN",
  "bookList": [
    {
      "id": 5,
      "title": "Le petit prince",
      "categoryList": null,
      "language": "French",
      "isbn": 9782070612758,
      "publicationDate": null,
      "numberOfPages": 120,
      "authorList": [],
      "libraryList": [
        {
          "id": 2,
          "name": "Library2",
          "coordinates": null
        },
        {
          "id": 1,
          "name": "Library1",
          "coordinates": null
        }
      ],
      "editor": null
    }
  ]
}

希望这有助于:)

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编辑于 2020-03-16

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