使用 shoulda_matchers 测试强参数

Question

我很难弄清楚如何使用 rspec 和 shoulda_matchers 测试强参数。

无论我尝试过什么，我总是收到消息：RSpec::Expectations::ExpectationNotMetError: Expected POST #create to restrict parameters on :language_name to :name, but it did not restrict any parameters.

这是我的控制器：

class LanguageNamesController < CrudController
  inherit_resources
  actions :all, :except => [:show]

  private
    def language_name_params
      params.require(:language_name).permit(:name)
    end
end

这是测试：

require 'rails_helper'
RSpec.describe LanguageNamesController, type: :controller do
  describe "parameters" do
    it do
     lm_params = {
       language_name: {
         name: 'John'
       }
     }
     expect(subject).to permit(:name).for(:create, params: { params: lm_params }).on(:language_name)
    end
  end
end

另外，我也试过了，结果是一样的：

it do
  subject.params = ActionController::Parameters.new(language_name: {foo: 'bar', name: 'baz'})
  expect(subject).to permit(:name).for(:create).on(:language_name)
end

如果我这样尝试，我会得到ArgumentError: unknown keyword: language_name：

it do
 lm_params = {
   language_name: {
     name: 'John'
   }
 }
 expect(subject).to permit(:name).for(:create, params: lm_params).on(:language_name)
end

我正在使用：

• 红宝石 2.5.1
• 导轨 5.1.6
• 应该匹配器 3.1.2

有人知道怎么解决吗？

谢谢！

---

这是我测试它的解决方法：

it do
  faker_name = Faker::Name.name

  params = {
    language_name: {name: faker_name, other_attribute: "other value"},
    extra: {extra: 1}
  }
  get :index, params: params

  expect(subject.send(:language_name_params)).to eq({"name"=> faker_name})
end

Answer 1

您不需要创建lm_params。应该匹配器将为您模拟 params 对象。

如果只需要测试权限可以should permit(:name).for(:create)

如果您需要检查允许参数的值：should permit(:name).for(:create, params: {name: 'John'})

strong_parameters_matcher.rb 的文档中有很好的示例

编辑：另一个很好的文档来源是rubydoc for shoulda matchers。