Mapping List<String> from List<Object> using mapstruct

Question

Hi I am getting null for List action in DTO while setting it from the Child Source class using mapstruct. Could some help me in resolving this. Please find my code here

Entity Class:

public class Source {
    int id;
    String name;
    List<ChildSource> childSource;
    //getters and setters
}

public class ChildSource {
    String code;
    String action;
    //getters and setters   
}

DestinationDTO:

public class TargetDTO{
    int sNo;
    String mName;
    List<String> actions;
    //getters and setters  
}

MApper Class:

@Mapper(componentModel = "spring")    
public abstract class SampleMapper {
        @Mappings({ 
            @Mapping(target = "id", source = "sno"),
            @Mapping(target = "name", source = "mNAme")
        })
        public abstract TargetDTO toDto(Source source);

        @IterableMapping(elementTargetType = String.class)
        protected abstract List<String> mapStringtoList(List<ChildSource> childSource);

        protected String mapChildSourceToString(ChildSource child) {
            return child.getAction();
        }
    }

But my action list is setting as null in the target dto. Could anyone help me here please?

How does the generated code looks

Filip
– Filip

2017-10-07 23:16:15 +00:00
Commented Oct 7, 2017 at 23:16 — Filip
– Filip, Commented Oct 7, 2017 at 23:16
stackoverflow.com/a/59219506/5456789

Amir Azizkhani
– Amir Azizkhani

2022-04-26 05:09:34 +00:00
Commented Apr 26, 2022 at 5:09 — Amir Azizkhani
– Amir Azizkhani, Commented Apr 26, 2022 at 5:09

kinath_ru · Accepted Answer · 2018-08-17 09:44:38Z

6

You can do it like this.


@Mapper(componentModel = "spring")    
public abstract class SampleMapper {
        @Mappings({ 
            @Mapping(target = "id", source = "sno"),
            @Mapping(target = "name", source = "mNAme"),
            @Mapping(target = "actions", source = "childSource")
        })
        public abstract TargetDTO toDto(Source source);

        protected abstract List mapStringtoList(List childSource);

        protected String mapChildSourceToString(ChildSource child) {
            return child.getAction();
        }
    }

answered Aug 17, 2018 at 9:44

kinath_ru

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1 Comment

Amir Azizkhani Over a year ago

abstract method of mapStringtoList is not necessary and you should add ChildSource childFromString(String child) implementation

David Conrad · Accepted Answer · 2023-08-09 17:01:18Z

3

Using a default method to map the ChildSource to a String.

@Mapper(componentModel = "spring")    
public abstract class SampleMapper {
    @Mappings({ 
        @Mapping(target = "id", source = "sno"),
        @Mapping(target = "name", source = "mNAme"),
        @Mapping(target = "actions", source = "childSource")
    })
    public abstract TargetDTO toDto(Source source);
    
    default String mapChildSourceToString(ChildSource child) {
        return child.getAction();
    }
}

edited Aug 9, 2023 at 17:01

David Conrad

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answered Mar 5, 2021 at 17:43

osama mussawir

311 bronze badge

1 Comment

Null Over a year ago

Please edit your post to explain how it answers the question.

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