Flattening RequestParam Object in OpenApi 3

Question

I am migrating from swagger 2 to OpenApi 3.

Swagger 2 Sample Code

    @ApiOperation(value = "", nickname = "")
        @GetMapping
          public List<Employee> findEmployees(@Valid Dto dto) {
                return employeeService.findEmployees(dto);
                }

OpenApi 3 Code

    @Operation(summary = "")
        @GetMapping
          public List<Employee> findEmployees(@Valid Dto dto) {
                return employeeService.findEmployees(dto);
                }

DTO Class

    @Data
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    public class Dto {
        private String status;
        private String name;
        private String destination;
    }

There is a significant difference in generation of swagger-ui in both cases.

Swagger 2 shows the DTO object as flattened into individual query params :

Image Flattening of object as individual query parameters happens in Swagger 2 ui

while OpenApi 3 creates a JSON object:

Image Object doesnot flattens but creates a json object

I want to have the flattening behavior in OpenApi 3 like the way it used to be in Swagger 2. Is there any way to achieve the same in OPENAPI 3.

Answer 1

After some research i found that a new version of openapiui dependency has been released on 12th of april 2020 and it solves my issue in hand. From version 1.3.2 its available.

<!-- https://mvnrepository.com/artifact/org.springdoc/springdoc-openapi-ui -->
<dependency>
    <groupId>org.springdoc</groupId>
    <artifactId>springdoc-openapi-ui</artifactId>
    <version>1.3.2</version>
</dependency>

The use of Annotation @ParameterObject before the query parameter object solves it.

   @Operation(summary = "")
        @GetMapping
          public List<Employee> findEmployees(**@ParameterObject** @Valid Dto dto) {
                return employeeService.findEmployees(dto);
                }