how to make parent model's variables as not required in child model, provided all the parent variables are marked as required?

Question

I have a parent definition which is extended by a child definition using allOf keyword. Since i have marked all the variables as required in parent model , it is being marked as required in child ,model too. But i need the parent variable to be marked as not required. Any ideas?

definitions: 
  Parent:
    type: "object"
    required:
      - "id"
    properties:
      id:
        type: "integer"
        format: "int64"
        minimum: 1
        example: "123456"        

  Child:
    allOf:
      - $ref: "#/definitions/Parent"
    type: "object"
    required: 
      - "sample"
    properties:
      sample:
        type: "string"
        format: "full-date"
        example: "2001/12/31"

Answer 1

You cannot un-require a parent model's fields in child models. The workaround is to define a base model, say, ParentBase, with optional properties and inherit both Parent and Child from this model.

definitions:
  ParentBase:
    type: object
    properties:
      id:
        type: integer
        format: int64
        minimum: 1
        example: 123456

  Parent:
    allOf:
      - $ref: "#/definitions/ParentBase"
      - required:
          - id

  Child:
    allOf:
      - $ref: "#/definitions/ParentBase"
      - type: object
        required: 
          - sample
        properties:
          sample:
            type: string
            format: full-date
            example: "2001/12/31"

On an unrelated note, the id property is defined as an integer but its example value is a string. This is wrong - the example data type should match the property type. You need to use 123456 without quotes.

id:
  type: integer
  #example: "123456"  # Wrong
  example: 123456     # Correct