Question

在@Mapper中使用多个参数时，似乎@Context参数不可访问

public interface MyMapper {

  @Mapping(target="target1", source="arg1.arg") //works
  @Mapping(target="target2", source="arg2") //works
  @Mapping(target="target3", source="arg2.arg") //works
  @Mapping(target="target2", source="context.arg") //NOT WORKING
  public MyTarget convert(Object arg1, Object arg2, @Context Object context);

}

我正在尝试使用和expression=""来解决它，但是我无法使其工作。

有什么建议吗？

我可以看出，我并不是唯一一个希望这样做的人。 https://github.com/mapstruct/mapstruct/issues/1280

谢谢

Answer 1

要回答第二个问题：


public interface MyMapper {

  @Mapping(target="target1", source="arg1.arg")
  @Mapping(target="target2", ignore = true ) // leave to after mapping 
  MyTarget convert(Object arg1, @Context Object context);

  @AfterMapping
  default convert(Object arg1, @MappingTarget MyTarget target, @Context context) {
        target.setTarget2( convert ( context ) );
  } 

  // if you have multipe mappings, you could address them here
  @Mapping(target="target2", source="context.arg") 
  MyInnerTarget convert(Object arg1, Object context);
}

Answer 2

根据定义，@Context带注释的对象不是源。这是上下文，因此您不能在source

中将其用作@Mapping(target="target2", source="context.arg")

Answer 3

我遇到了与需要@Context参数才能传递给嵌套映射函数的情况相同的场景，但是我还想将其用作@Mapping中的源。我可以使用expression来实现此目标，如下所示：

public interface MyMapper {

  @Mapping(target="target1", source="arg1")
  @Mapping(target="target2", source="arg2")
  @Mapping(target="target3", expression="java( contextArg )")
  public MyTarget convert(Object arg1, Object arg2, @Context Object contextArg);

}

Mapstruct：在@Mapping的源参数中使用上下文

3 个答案: