Ruby 当Grape API为哈希或数组且内部值为'时，如何显示其参数；t定义为招摇过市文档

我正在使用swagger文档在GrapeAPI中生成API文档。API参数的定义如下：

desc "Get results by query"
  params do
    requires :type, type: String,  desc: "search type"
    requires :body, type: Hash,    desc: "query body"
    optional :user, type: Hash,    desc: "support search as other user, otherwise search as current user" do
      requires :id,         type: String, desc: "user id"
      requires :name,       type: String, desc: "user name (dn)"
      requires :directory,  type: String, desc: "directory user belongs to"
    end
  end
  post :query do

仅显示与用户相关的参数。如何定义其密钥不受限制且可以在API文档中生成的哈希参数