ModelAttribute not visible in Swagger

Question

I am using Spring 2.3 and imported swagged using

    implementation('io.springfox:springfox-swagger2:2.8.0')
    implementation('io.springfox:springfox-swagger-ui:2.8.0')

I want to accept pagination params from the UI, and the model is

@Immutable
@JsonSerialize(as = ImmPaginationParameters.class)
@JsonDeserialize(as = ImmPaginationParameters.class)
public interface PaginationParameters {
    Integer getLimit();
    Integer getOffset();
}

In the controller I have declared the method as

    @GetMapping("/preview")
    @NonNull
    ResponseEntity<List<SomeDto>> getPreviewResults(@PathVariable final String projectId,
                                                    @ModelAttribute final PaginationParameters params) {

However, the same does not get reflected in the Swagger UI.

I tried converting it into a post mapping and add @Valid too in front of PaginationParameters but the same thing. Checked the API docs, again no sign of pagination params. I checked the post What is @ModelAttribute in Spring MVC? and this way of defining modelAttribute looks sufficient. Not sure I have to declare something different in the PaginationParams class.

Gaurav Dhiman · Answer 1 · 2020-10-21T17:36:04.097

2

Try using @RequestBody along with @ApiParam instead of @ModelAttribute, also use @Postmapping as you are passing request body :-

@PostMapping("/preview")
@NonNull
ResponseEntity<List<SomeDto>> getPreviewResults(@ApiParam @PathVariable final String projectId,
                                                @ApiParam @RequestBody final PaginationParameters params) {

edited Oct 21 '20 at 17:36

answered Oct 21 '20 at 17:29

Gaurav Dhiman

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But @Gaurav this actually is a use case for making a request, so ideally i shouldn't have to convert it to post. Is there no way we can achieve the same with ModelAttribute? – A_G Oct 21 '20 at 17:46
whenever we make a request and when the request have body we should go with PostMapping and in case of REST APIs best practice is to use RequestBody to map the request object – Gaurav Dhiman Oct 21 '20 at 17:50
yeah so that's why I was hoping to `ModelAttribute` instead of RequestBody to keep it `GET` request conventionally. – A_G Oct 21 '20 at 17:59
with GET it won't work for swagger, you will have to change it to POST. – Gaurav Dhiman Oct 21 '20 at 18:36
actually it does, I posted the solution above. Immutables are not supported :( – A_G Oct 21 '20 at 18:55

score -1 · Answer 2 · answered Oct 21 '20 at 18:22

-1

Turns out that ModelAttribute doesn't work well with Immutable class. After changing it to lombok, it worked

@Data
public class PaginationParameters {
    private Integer limit;
    private Integer offset;
}

answered Oct 21 '20 at 18:22

A_G

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This comment doesn't answer the actual problem. This is nothing to do with lombok. – Anshita Singh Jun 07 '22 at 12:04

ModelAttribute not visible in Swagger

2 Answers2