trustieforge/app/api/mobile/apis/upgrade.rb

#coding=utf-8

module Mobile
  module Apis
    class Upgrade < Grape::API
      include ApplicationHelper
      resource :upgrade do
        desc "get update info"
        params do
          requires :platform, type: String, desc: '平台名，android, ios'
        end
        get do
          @current_version = ::PhoneAppVersion.reorder('created_at desc').first
          attachment = @current_version.attachments.first
          if attachment.nil?
            raise '未发现客户端！'
          end
          url = "http://" + Setting.host_name + "/attachments/download/" + attachment.id.to_s + "/" + attachment.filename
          {
            version: @current_version.version,
            url: url,
            desc: @current_version.description
          }
        end
      end

    end
  end
end