get:
  summary: Gets all polls.
  responses:
    '200':
      description: OK
      content:
        application/json:
          schema:
            type: array
            items:
              $ref: ../components/schemas/Poll.yaml
post:
  summary: Creates a poll.
  requestBody:
    required: true
    content:
      application/json:
        schema:
          $ref: ../components/schemas/Poll.yaml
  responses:
    '201':
      description: Created
      content:
        application/json:
          schema:
            type: object
            properties:
              id:
                type: string
                description: Id of the created poll.
      links:
        GetPollByPollId:
          $ref: ../components/links/GetPollByPollId.yaml
        SetPollByPollId:
          $ref: ../components/links/SetPollByPollId.yaml
        DelPollByPollId:
          $ref: ../components/links/DelPollByPollId.yaml
        JudgeByPollId:
          $ref: ../components/links/JudgeByPollId.yaml
        ResultsByPollId:
          $ref: ../components/links/ResultsByPollId.yaml
    '400':
      description: Bad Request. Expect at least 2 candidates and a title.