spring rest multipart - combine file and json object

[bulalak]

I described a multipart request in the yml where I want to combine more data (file + json object) into single body. But generated code (interface) for spring rest is used with @RequestParam annotation and it is not working. When I manually replace it with @RequestPart it is working correctly.

plugin in pom

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>3.0.1</version>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <inputSpec>${basedir}/src/main/resources/swagger-api.yml</inputSpec>
                <generatorName>spring</generatorName>
                <modelNameSuffix>DTO</modelNameSuffix>
                <apiPackage>sk.xxx.document.api</apiPackage>
                <modelPackage>sk.xxx.document.model</modelPackage>
                <generateSupportingFiles>false</generateSupportingFiles>
                <configOptions>
                    <interfaceOnly>true</interfaceOnly>
                    <dateLibrary>java8</dateLibrary>
                    <java8>false</java8>
                    <jdk8>true</jdk8>
                    <library>spring-boot</library>
                </configOptions>
            </configuration>
        </execution>
    </executions>
</plugin>

yml

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger document
servers:
  - url: http://localhost:9999
paths:
  /documents:
    post:
      operationId: addDocument
      requestBody:
        description: add document
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                person:
                  $ref: '#/components/schemas/PersonNew'
                file:
                  type: string
                  format: binary
            encoding:
              person:
                contentType: application/json
      responses:
        '200':
          description: success operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Person'
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Person:
      allOf:
        - $ref: '#/components/schemas/PersonNew'
        - required:
          - id
          properties:
            id:
              type: integer
              format: int64

    PersonNew:
      type: object
      required:
        - firstName
        - lastName
      properties:
        firstName:
          type: string
        lastName:
          type: string
        bithDate:
          type: string
          format: 'date-time'

    Error:
      required:
        - code
        - message
      properties:
        code:
          type: integer
          format: int32
        message:
          type: string

generated interface

    ResponseEntity<PersonDTO> addDocument(@ApiParam(value = "", defaultValue="null") @RequestParam(value="person", required=false)  PersonNewDTO person,@ApiParam(value = "file detail") @Valid @RequestPart("file") MultipartFile file);

[carlosmonterocanabal]

Hi @bulalak , did you resolve this bug with any workaround?

[kowlown]

This bug is still present

[lvanderbijl-kry]

Same problem here, multipart body with a json object gets generated as @RequestParam instead of @RequestPart.