CODEWITHSUNDEEP
javamapstruct
Sami Asmar
Sami Asmar

Reputation: 131

How to Map an object contains a List with Mapstruct

Given the Source class as defined below:

class Source{
    private String name;
    private int age;
    private List<Phone> phones;
    // getters and setters
}

and the Phone class as defined below:

class Phone{
        private Long id;
        private String phoneNumber;
        // getters and setters
    }

and the Target class as defined below:

class Target{
    private String name;
    private int age;
    private List<Long> idsPhones;
    // getters and setters
}

I have an interface is:

@Mapper
interface MyMapper{
    Target toTarget(Source source);
    Source toSource(Target target);
}

How can I map the List of Phones from the Source class to a List of idsPhones in the Target Class and vice versa?

Upvotes: 2

Views: 2456

Answers (1)

Filip
Filip

Reputation: 21393

In order to achieve this you need to help MapStruct a bit by telling how to map from Phone into Long. And the reverse as well.

Your mapper needs to look something like:

@Mapper(uses = PhoneRepository.class)
interface MyMapper {

    @Mapping(target = "idsPhones", source = "phones")
    Target toTarget(Source source);

    @InheritInverseMapping
    Source toSource(Target target);

    default Long fromPhone(Phone phone) {
        return phone.getId();
    }
}

If your PhoneRepository contains a method that accepts a Long and returns Phone then MapStruct will automatically know what to do and invoke that method.

Upvotes: 2

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