openapi-schema-composition.yaml

openapi: 3.0.2
info:
  title: Swagger Petstore - Schema Inheritence
  description: |
    This is a sample OpenAPI file to show schema inheritence
  version: 1.0.0
servers:
  - url: /api/v3
tags:
  - name: Pet
    description: Everything about your Pets
paths:
  /pet:
    get:
      tags:
        - Pet
      summary: List available pets in the store
      operationId: listPets
      responses:
        "200":
          description: Successful operation
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: "#/components/schemas/Pet"
    post:
      tags:
        - Pet
      summary: Add a new pet to the store
      operationId: addPet
      requestBody:
        description: Create a new pet in the store
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/CreatePetRequest"
        required: true
      responses:
        "200":
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/PetWithDetails"
  /pet/{petId}:
    parameters:
      - name: petId
        in: path
        description: ID of pet to return
        required: true
        schema:
          type: integer
          format: int64
    get:
      tags:
        - Pet
      summary: Find pet by ID
      description: Returns a single pet
      operationId: getPetById

      responses:
        "200":
          description: successful operation
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/PetWithDetails"
    put:
      tags:
        - Pet
      summary: Update an existing pet
      operationId: updatePet
      requestBody:
        description: Update an existent pet in the store
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Pet"
        required: true
      responses:
        "200":
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/PetWithDetails"
components:
  schemas:
    CreatePetRequest:
      type: object
      properties:
        name:
          type: string
        type:
          type: string
    Pet:
      allOf:
        - $ref: "#/components/schemas/CreatePetRequest"
        - type: object
          properties:
            adopted_at:
              type: string
            created_at:
              type: string
              readOnly: true
    PetWithDetails:
      allOf:
        - $ref: "#/components/schemas/Pet"
        - type: object
          properties:
            total_steps:
              type: string
              readOnly: true