Report an error when the discriminator property is not defined in 'oneOf' the schema types?

[senthilkumarmohan]

Should we report an error when the discriminator property is not defined in 'oneOf' the schema types? in the below example, pet2 doesn't have the expected discriminator property.

responses:
'200':
description: pet response
content:
application/json:
schema:
oneOf:
- "$ref": '#/components/schemas/pet1'
- "$ref": '#/components/schemas/pet2'
discriminator:
propertyName: petType
components:
schemas:
pet1:
type: object
required:
- id
properties:
id:
type: integer
format: int64
petType:
type: string
pet2:
type: object
required:
- id
properties:
id:
type: integer
format: int64

[PerthCharern]

From the spec, we might be able to be even stricter:

https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#composition-and-inheritance-polymorphism

"... As such, the discriminator field MUST be a required field. There are are two ways to define the value of a discriminator for an inheriting instance."

Would you like to send out a PR? :)

[senthilkumarmohan]

Thanks for your response. I am working on it - will submit a PR soon.

[senthilkumarmohan]

@PerthCharern, i have submitted a PR for this. Please can you review?