OpenAPI 3.x: add support for getting example values in request body for schemas with anyOf and allOf keywords when there are other properties

[glowcloud]

Content & configuration

Example Swagger/OpenAPI definition:

openapi: 3.0.3
info:
  title: Example app
  description: Example
  version: 1.0.0
  contact:
    name: John Doe
    email: jonhdoe@contact.com
servers:
  - url: https://dev.app.com/appApplicationName
    description: DEV
paths:
  /documentsWithCombineOneOf:
    post:
      description: ''
      summary: Add a document - KO
      requestBody:
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/ModelPostDocumentOneOfCombineModelFile'
      operationId: testOneOf
      security:
        - Basic: []
      tags: []
      responses:
        '200':
          $ref: '#/components/responses/Default'
components:
  schemas:
    AbstractModelPostDocument:
      type: object
      properties:
        title:
          type: string
          default: ''
          maxLength: 64
          example: MyDocument.pdf'
        category:
          type: string
          pattern: ''
        type:
          type: string
          description: Type depends on category
        issuingApplicationId:
          type: string
          enum:
            - App1
            - App2
            - App3
            - App4
        documentDate:
          type: string
          description: >-
            Creation date of the document. Example : For ID card, it is the
            issuing date of the card.
          format: date
        sharedWith:
          type: array
          items:
            type: string
            enum:
              - CustomerPortal
              - PartnerPortal
          uniqueItems: true
          minItems: 0
          maxItems: 2
      required:
        - title
        - category
        - type
        - documentDate
        - file
    ModelPostDocumentPolicy:
      allOf:
        - $ref: '#/components/schemas/AbstractModelPostDocument'
        - type: object
          properties:
            policyNumber:
              type: string
              description: Policy Number
              example: '132456'
              minLength: 1
              maxLength: 36
              pattern: ''
          description: Metadata for policy documents
          required:
            - policyNumber
    ModelPostDocumentCustomer:
      allOf:
        - $ref: '#/components/schemas/AbstractModelPostDocument'
        - type: object
          properties:
            customerNumber:
              type: number
              description: Customer Number
              exclusiveMinimum: true
              minimum: 0
              exclusiveMaximum: true
              maximum: 99999999999999
            organisationName:
              type: string
              enum:
                - Organisation1
                - Organisation2
                - Organisation3
              description: Organisation Name
          required:
            - organisationName
            - customerNumber
          description: Metadata for Customer Documents
    ModelPostDocumentInvoice:
      allOf:
        - $ref: '#/components/schemas/AbstractModelPostDocument'
        - type: object
          properties:
            invoiceNumber:
              type: string
              description: Invoice Number
              example: '132456'
              minLength: 1
              maxLength: 36
              pattern: ''
            amount:
              type: number
              example: 1234.56
              description: Invoice Amount
          description: Metadata for invoice documents
          required:
            - amount
            - invoiceNumber
    ModelPostDocumentOneOf:
      oneOf:
        - $ref: '#/components/schemas/ModelPostDocumentPolicy'
        - $ref: '#/components/schemas/ModelPostDocumentCustomer'
        - $ref: '#/components/schemas/ModelPostDocumentInvoice'
      example:
        title: other.pdf
        category: Policy
        type: Policy
        issuingApplicationId: App1
        documentDate: '2021-01-01'
        sharedWith:
          - CustomerPortal
        policyNumber: '132456'
    ModelFile:
      type: object
      properties:
        content:
          type: string
          format: binary
      required:
        - content
    ModelPostDocumentOneOfCombineModelFile:
      allOf:
        - $ref: '#/components/schemas/ModelFile'
        - type: object
          properties:
            metadata:
              $ref: '#/components/schemas/ModelPostDocumentOneOf'
          required:
            - metadata
  securitySchemes:
    Basic:
      type: http
      scheme: basic
  responses:
    Default:
      description: Not needed
      headers: {}
      content:
        application/json:
          schema:
            type: string
            description: not needed
tags: []

Describe the bug you're encountering

With changes in #9762, we're introducing support for getting examples for schemas from oneOf and anyOf schemas for request body with content type application/x-www-form-urlencoded and multipart/form-data.

If we don't have any other properties in the schema, we will overwrite it with the first oneOf/anyOf schema, so that we can have properties like type, format, etc.

If we have other properties, we won't be overwriting them so that we don't lose anything from the parent schema. We will still get an example but we can have a situation where other properties, like type, are actually defined in the nested schema, and our input for it will look like this:

instead of:

We should add support for the case where we have other properties in the parent schema.

[glowcloud]

Addressed by #9767