CODEWITHSUNDEEP
javaspringmapstruct
user1436883
user1436883

Reputation: 51

smart mapstruct mapping from JSON to DTO

i am working on a spring application and using Spring Webclient to make REST call to an external service. as a result, i have this object :

{
    "error": 0,
    "message": "",
    "totalItems": 1,
    "entities": [
        [
            {
                "entityName": "Field 1",
                "entityValue": "String value 1"
            },
            {
                "entityName": "Field 2",
                "entityValue": "Date Value 2 in dd-mm-yyyy format"
            }
        ]
    ]
}

now i would like to create a DTO that contains two fields (String field1 and Date field2) and tell mapstruct to populate field1 with the entityValue corresponding to entityName Field 1 and same thing for field 2. how can i achieve that in a smart way ? ideally without looping on all entityName/entityValue pairs in each entity.

for now i have two DTOs representing my REST result :

public class Wrapper {
    private int error;
    private String message;
    private int totalItems;
    private List<PairEntity> entities;
}
and 
public class PairEntity {
    private String entityName;
    private String entityValue;
}

Upvotes: 3

Views: 8834

Answers (1)

Marc Stroebel
Marc Stroebel

Reputation: 2357

A little looping is included...

if entityName is unique, change your dto to use a Map<String, String> or Map<String, PairEntity> (key = entityName) instead of List<PairEntity>. You'll need a custom jackson mapper or gson, depending which lib is in use...

Or create an new dto and convert the list to a map manually.

Then create a custom mapping in mapstruct and get the values from the map.

https://www.baeldung.com/java-list-to-map

https://www.baeldung.com/jackson-deserialization

https://www.baeldung.com/mapstruct-custom-mapper

Upvotes: 2

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