我想返回路径中的Activity列表。我试图通过在items属性中定义Activity类型来实现这一点：

#...
# intendation is not correct here
responses:
  '200':
    description: Successful response
    content:
      application/json:
        schema:
          type: array
          items:
            $ref: '#/components/responses/Activity'
#...
components:
  responses:
    Activity:
      description: Activity object
      content:
        application/json:
          schema:
            type: object
            properties:
              id:
                type: integer
                format: int64
              author_id:
                type: integer
                format: int64
              amount:
                type: integer
                format: int64
              activity_type:
                $ref: '#/components/schemas/ActivityType'
              start_time:
                type: string
                format: date
              end_time:
                type: string
                format: date

字符串
但这不会导致Activity列表，而是导致：

[
  "string"
]

型
我如何修复这个/实现一个Activity列表作为返回值？我已经尝试搜索文档。