OpenAPI reuse part of definition without defining a new one

[Gabriele Proietti Mattia]

Suppose that I have this definition in a yaml OpenApi definition

definitions:
  User:
    description: "User"
    type: "object"
    properties:
      firstname:
        type: "string"
      lastname:
        type: "string"
      password:
        type: "string"
      email:
        type: "string"
      username:
        type: "string"

If in a parameters specification I need specific fields of a definition how can I refer them without defining another model as below?

definitions:
  UserLogin:
    description: "User"
    type: "object"
    properties:
      password:
        type: "string"
      email:
        type: "string"

[Ron Ratovsky]

You can’t. JSON Schema doesn’t allow you to pick fields out of a definition.

You can define the smaller instance, and make the bigger one an extension of the smaller one to avoid repetition.

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