Setting default value on an enum causes the default to always be used

Q	A
Bug or feature request?	Bug
Which Swagger/OpenAPI version?	2
Which Swagger-UI version?	3.2.2
How did you install Swagger-UI?	Composer
Which browser & version?	Chrome 61
Which operating system?	Windows 10

Whenever a default is set on an enum parameter it becomes impossible to send another version than the default.

Demonstration API definition

swagger: '2.0'
host: localhost
info:
  title: Demo
  description: Demo
  version: 1.0.0
schemes:
  - https
consumes:
  - application/json
produces:
  - application/json
paths:
  '/demo':
    get:
      summary: Enum demo
      parameters:
        - name: enum_demo
          in: query
          required: true
          type: string
          default: first_value
          enum:
            - first_value
            - second_value
      responses:
        '200':
          description: Result
          schema:
            type: array
            items:
              type: object

Expected Behavior

The value selected in the dropdown box to be sent in the query string

Current Behavior

The default value is always sent in the query string

Possible Solution

Whenever you omit the default tag the request is fine

[webron]

I wouldn’t dig too much into it. If the fix is there, it’ll roll into the editor in this week’s release because there’s definitely going to be one.

[BasKooij]

Yes, this look fine to me. The dropdown selects the default at first, and the right value appears in the query when I submit the request. I tried both with and without the required keyword and with default values that are not in the enum.