Issue
How to map/merge multiple fields into one field? Like concatenate a firstname
and lastname
to the destination fullname
?
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;
}
}
Solution
You can use a Converter
within a PropertyMap
for this.
Just configure your mapper like this:
@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;
}
Answered By - d0x
Answer Checked By - Mildred Charles (JavaFixing Admin)