modelmapperを使用して複数のフィールドを1つの宛先フィールドにマップする方法

Question

複数のフィールドを1つのフィールドにマップ/マージする方法はありますか？同じように、fullnameにfirstnameとlastnameを連結しますか？

public class ModelMapperConfigTest { 

    @Test 
    public void should_validate() { 
     new ModelMapperConfig().modelMapper().validate(); 
    } 

    @Data 
    public static class Person { 
     private String firstname; 
     private String lastname; 
    } 

    @Data 
    public static class PersonDto { 
     private String firstname; 
     private String lastname; 
     private String fullname; 
    } 

    // Test data 

    @Test 
    public void should_map_multiple_fields_into_one() { 

     ModelMapper modelMapper = new ModelMapper(); 
     modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT); 

     // TODO: Configure modelmapper to merge the two fields 

     // test that all fields are mapped 
     modelMapper.validate(); 

     // test that the age is calculated 
     Person person = new Person(); 
     person.setFirstname("Marilyn"); 
     person.setLastname("Monroe"); 
     PersonDto personDto = modelMapper.map(person, PersonDto.class); 
     assertEquals(personDto.fullname, "Marilyn Monroe"); 
    } 

    // This method should be used for mapping. In real, this could be a service call 
    private String generateFullname(String firstname, String lastname) { 
     return firstname + " " + lastname; 
    } 
} 

Answer 1

あなたはこのためにConverterPropertyMap内を使用することができます。

ただ、このようなあなたのマッパーを設定します。

@Test 
public void should_map_multiple_fields_into_one() { 

    ModelMapper modelMapper = new ModelMapper(); 
    modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STRICT); 

    modelMapper.createTypeMap(Person.class, PersonDto.class) 
      .addMappings(
        new PropertyMap<Person, PersonDto>() { 
         @Override 
         protected void configure() { 
          // define a converter that takes the whole "person" 
          using(ctx -> generateFullname(
            ((Person) ctx.getSource()).getFirstname(), 
            ((Person) ctx.getSource()).getLastname()) 
          ) 
          // Map the compliete source here 
          .map(source, destination.getFullname()); 
         } 
        }); 

    // test that all fields are mapped 
    modelMapper.validate(); 

    // test that the age is calculated 
    Person person = new Person(); 
    person.setFirstname("Marilyn"); 
    person.setLastname("Monroe"); 
    PersonDto personDto = modelMapper.map(person, PersonDto.class); 
    assertEquals(personDto.fullname, "Marilyn Monroe"); 
} 

// This method should be used for mapping. In real, this could be a service call 
private String generateFullname(String firstname, String lastname) { 
    return firstname + " " + lastname; 
}