如何连接RSpec 3.12请求中的属性？

问：

我的应用程序中的编辑视图提供了预期的数据字段，以及不属于模型的额外字段，例如注释和平移，这些字段在保存编辑的记录之前由控制器方法处理。

在编写请求测试时，除了模型字段外，我还需要向 Post 方法提供这些额外的字段：

RSpec.describe "Playgrounds", type: :request do
  include Warden::Test::Helpers 
  # Playground. As you add validations to Playground, be sure to
  # adjust the attributes here as well.

  let(:user) { create(:user, is_admin: true) }
  let(:playground) {FactoryBot.create(:playground)}

  # User login 
  before do
    login_as user, scope: :user
  end

  describe "POST /playgrounds" do
    context "with valid attributes" do
      # Use per context let instead 
      let(:attributes) { attributes_for(:playground) }
      it "creates a playground" do
        expect {
          post '/entities', params: {
            playground: attributes, 
            playground_name_fr: "Donnée de test", 
            playground_name_de: "", 
            playground_name_en: "Test data", 
            playground_name_it: "Dati del test", 
            playground_description_fr: "Ceci n'est qu'un test", 
            playground_description_de: "", 
            playground_description_en: "This is just a test", 
            playground_description_it: "Questo è solo un test"
          }
        }.to change(Playground, :count).by(1)
        expect(response).to have_http_status 302
      end
    end 
  end
end

为了只定义一次用于翻译的这 8 个字段，我想定义一个 Hash 变量，并将其添加到 playground Hash 中：

RSpec.describe "Playgrounds", type: :request do
  include Warden::Test::Helpers 
  # Playground. As you add validations to Playground, be sure to
  # adjust the attributes here as well.

  let(:user) { create(:user, is_admin: true) }
  let(:playground) {FactoryBot.create(:playground)}
  let(:fields) do 
    { 
      playground_name_fr: "Donnée de test", 
      playground_name_de: "", 
      playground_name_en: "Test data", 
      playground_name_it: "Dati del test", 
      playground_description_fr: "Ceci n'est qu'un test", 
      playground_description_de: "", 
      playground_description_en: "This is just a test", 
      playground_description_it: "Questo è solo un test" 
    }
  end

    # User login 
    before do
        login_as user, scope: :user
    end

  describe "POST /playgrounds" do
    context "with valid attributes" do
      # Use per context let instead 
      let(:attributes) { attributes_for(:playground) }
      it "creates a playground" do
        expect {
          post '/entities', params: {
            playground: attributes < fields 
          }
        }.to change(Playground, :count).by(1)
        expect(response).to have_http_status 302
      end
    end 
  end
end 

但随后我收到以下错误：

 Failure/Error:
   params.require(:playground)
         .permit(:code,
                 :status_id,
                 :logo,
                 :organisation_id,
                 :responsible_id,
                 :deputy_id,
                 :sort_code,
                 name: {},
                 description: {}

 NoMethodError:
   undefined method `permit' for "false":String

由于第一种语法按预期工作，而第二种语法则没有，我可能在错误的位置或级别插入了字段，但我找不到解决这个问题的方法？

感谢您的帮助！