如何上传文件在葡萄自行其是？(错误:不支持所请求的格式'txt&#39；)

Question

我需要实现文件上传使用葡萄UI。我们有这些宝石：

gem 'grape'
gem 'grape-entity'
gem 'grape-papertrail'
gem 'grape-swagger'
gem 'grape-swagger-entity'

在我的attachments_api.rb里

# frozen_string_literal: true

module V1
  class AttachmentsAPI < ApplicationAPI
    content_type :pdf, 'multipart/form-data'

    resource :attachments do
      desc 'Upload attchment file'
      params do
        requires :file, type: File, documentation: { param_type: 'formData', data_type: 'file' }
      end
      post do
        byebug
      end
    end
  end
end

但是，当我在UI (https://editor.swagger.io/)中运行它时，每次都会收到相同的错误(我尝试附加txt文件，png或pdf并不重要)：

The requested format 'txt' is not supported.

更奇怪的外观生成了json_doc：

paths:
  /attachments:
    post:
      description: Upload attchment file
      produces:
        - application/json
      consumes:
        - application/json
      parameters:
        - in: formData
          name: file
          type: file
          required: true
      responses:
        '201':
          description: Upload attchment file
      tags:
        - attachments
      operationId: postAttachments

我不明白为什么我们看到那里

consumes:
  - application/json

如何修复此错误并进行适当的文件上传？谢谢你的帮助!

Answer 1

这解决了问题：

desc 'Upload attachment file', consumes: ['multipart/form-data']