Return an array of objects with fieldName in spring boot

Question

I am new to springboot. My requirement is as below. I have carModel class as below.

@Data
public class CarModel {
 private modelName;
 private available;
}

Now I have a rest endpoint that returns the list of objects. So the resource looked something like this.

@GetMapping("/models")
public List<CarModel> getModels(){ 
//Resource Body
}

But this return an array of objects in json, with no field name. But I need the the json , something like this:

{ "AllModels" : [ { "modelName" : "Ferrari", "available" : "Yes"} , {"modelName": "Tesla" , "available" : "Yes"} ]

How can I do this in spring boot? I do know of a solution by defining one more wrapper class with list of CarModel objects in it. But is there any better way of doing it(Something like any annotations, etc.,)

Thanks!

Are you just missing the AllModels wrapper? You should be getting the array of objects with the field names by default. — Windle
– Windle, Commented Dec 14, 2020 at 18:09
He wants to avoid using a wrapper class and asks if a better alternative exist — Panagiotis Bougioukos
– Panagiotis Bougioukos, Commented Dec 14, 2020 at 18:11

Przemek · Accepted Answer · 2020-12-14 19:04:20Z

1

You can use ResponseEntity method that is already there available in Spring MVC. Would something like this work for you?

@GetMapping("/models")
    public ResponseEntity<List<CarModel>> getCars() {
        List<CarModel> carModels = service.methodThatReturnsListOfCarModels();
        return ResponseEntity.ok().body(new HashMap<>(){{put("AllModels", carModels);}});
    }

edited Dec 14, 2020 at 19:04

answered Dec 14, 2020 at 18:20

Przemek

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3 Comments

Panagiotis Bougioukos Over a year ago

"AllModels" key will not be available then

Przemek Over a year ago

@Panagiwths Mpougioukos Well, then I guess you can create a hashmap within that. I have updated the code in soultion accordingly

Deekshith Anand Over a year ago

This was exactly what I was looking for, to modify response body on the go!

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