Java Mapstruct：仅针对集合映射忽略特定字段
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Mapstruct: Ignore specific field only for collection mapping
提问by Dmitry Kach
I am using following mapper to map entities:
我正在使用以下映射器来映射实体：
public interface AssigmentFileMapper {
AssigmentFileDTO assigmentFileToAssigmentFileDTO(AssigmentFile assigmentFile);
AssigmentFile assigmentFileDTOToAssigmentFile(AssigmentFileDTO assigmentFileDTO);
@Mapping(target = "data", ignore = true)
List<AssigmentFileDTO> assigmentFilesToAssigmentFileDTOs(List<AssigmentFile> assigmentFiles);
List<AssigmentFile> assigmentFileDTOsToAssigmentFiles(List<AssigmentFileDTO> assigmentFileDTOs);
}
I need to ignore the "data" field only for entities that mapped as collection.
But it looks like @Mappingworks only for single entities. Also I've noticed that generated method assigmentFilesToAssigmentFileDTOsjust uses assigmentFileToAssigmentFileDTOin for-loop. Is there any solution for that?
我只需要忽略映射为集合的实体的“数据”字段。但它看起来@Mapping只适用于单个实体。我也注意到生成的方法assigmentFilesToAssigmentFileDTOs只是assigmentFileToAssigmentFileDTO在 for 循环中使用。有什么解决办法吗？
采纳答案by Filip
MapStruct uses the assignment that it can find for the collection mapping. In order to achieve what you want you will have to define a custom method where you are going to ignore the datafield explicitly and then use @IterableMapping(qualifiedBy)or @IterableMapping(qualifiedByName)to select the required method.
MapStruct 使用它可以为集合映射找到的分配。为了实现您想要的，您必须定义一个自定义方法，您将在其中data显式忽略该字段，然后使用@IterableMapping(qualifiedBy)或@IterableMapping(qualifiedByName)选择所需的方法。
Your mapper should look like:
您的映射器应如下所示：
public interface AssigmentFileMapper {
AssigmentFileDTO assigmentFileToAssigmentFileDTO(AssigmentFile assigmentFile);
AssigmentFile assigmentFileDTOToAssigmentFile(AssigmentFileDTO assigmentFileDTO);
@IterableMapping(qualifiedByName="mapWithoutData")
List<AssigmentFileDTO> assigmentFilesToAssigmentFileDTOs(List<AssigmentFile> assigmentFiles);
List<AssigmentFile> assigmentFileDTOsToAssigmentFiles(List<AssigmentFileDTO> assigmentFileDTOs);
@Named("mapWithoutData")
@Mapping(target = "data", ignore = true)
AssignmentFileDto mapWithouData(AssignmentFile source)
}
You should use org.mapstruct.Namedand not javax.inject.Namedfor this to work. You can also define your own annotation by using org.mapstruct.Qualifier
你应该使用org.mapstruct.Named而不是javax.inject.Named为了这个工作。您还可以通过使用定义自己的注释org.mapstruct.Qualifier
You can find more information here in the documentation.
您可以在此处的文档中找到更多信息。
