为什么 before_action :authorize 因“参数数量错误”而失败？

【问题标题】：Why does before_action :authorize fail with 'wrong number of arguments'?为什么 before_action :authorize 因“参数数量错误”而失败？
【发布时间】：2014-06-01 19:24:37
【问题描述】：

我已将 Pundit 与 Devise 一起设置为对我的应用程序进行授权。在我的一个控制器中，我有before_action :authorize。

然后我有以下测试：

describe SomeController do
  before(:each) do
    login_user(FactoryGirl.create(:user, :user_type => :admin))
  end

  describe "GET index" do
    it "it retrieves the index" do
      something = FactoryGirl.create(:Something)
      get :index
      assigns(:something).should eq([something])
    end
  end
end

我收到错误：

wrong number of arguments (0 for 1)

登录助手相当简单：

module ControllerMacros
  def login_user(user)
    if user.nil?
      user = FactoryGirl.create(:user)
    end

    @request.env["devise.mapping"] = Devise.mappings[:user]
    sign_in user
  end
end

更新： 堆栈跟踪：

Failure/Error: get :index
     ArgumentError:
       wrong number of arguments (0 for 1..2)
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/pundit-0.2.3/lib/pundit.rb:62:in `authorize'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:424:in `block in make_lambda'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:160:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:160:in `block in halting'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:149:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:149:in `block in halting_and_conditional'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:229:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:229:in `block in halting'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:149:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:149:in `block in halting_and_conditional'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:166:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:166:in `block in halting'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:166:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:166:in `block in halting'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:166:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:166:in `block in halting'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:86:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/callbacks.rb:86:in `run_callbacks'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/abstract_controller/callbacks.rb:19:in `process_action'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/action_controller/metal/rescue.rb:29:in `process_action'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/notifications.rb:159:in `block in instrument'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.1/lib/active_support/notifications.rb:159:in `instrument'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.1/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/abstract_controller/base.rb:136:in `process'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionview-4.1.1/lib/action_view/rendering.rb:30:in `process'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/action_controller/test_case.rb:595:in `process'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/action_controller/test_case.rb:64:in `process'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.2.4/lib/devise/test_helpers.rb:19:in `block in process'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.2.4/lib/devise/test_helpers.rb:72:in `catch'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.2.4/lib/devise/test_helpers.rb:72:in `_catch_warden'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/devise-3.2.4/lib/devise/test_helpers.rb:19:in `process'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.1.1/lib/action_controller/test_case.rb:495:in `get'
     # ./spec/controllers/SomeController_spec.rb:31:in `block (4 levels) in <top (required)>'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:114:in `instance_eval'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:114:in `block in run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_exec'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_eval_with_args'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:247:in `instance_eval_with_args'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/hooks.rb:106:in `block (2 levels) in run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:179:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:179:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_exec'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_eval_with_args'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:247:in `instance_eval_with_args'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/hooks.rb:106:in `block (2 levels) in run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/hooks.rb:108:in `call'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/hooks.rb:108:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/hooks.rb:446:in `run_hook'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:340:in `run_around_each_hooks'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:256:in `with_around_each_hooks'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example.rb:111:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:390:in `block in run_examples'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:386:in `map'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:386:in `run_examples'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:371:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:372:in `block in run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:372:in `map'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:372:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:372:in `block in run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:372:in `map'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/example_group.rb:372:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/command_line.rb:28:in `block (2 levels) in run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/command_line.rb:28:in `map'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/command_line.rb:28:in `block in run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/reporter.rb:58:in `report'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/command_line.rb:25:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/runner.rb:80:in `run'
     # /Users/Me/.rvm/gems/ruby-2.0.0-p247/gems/rspec-core-2.14.8/lib/rspec/core/runner.rb:17:in `block in autorun'

【问题讨论】：

  • 告诉我们您显示的代码中出现错误的位置。
  • 运行单元测试时出错。
  • 在哪个文件的哪一行（以及在您显示的代码中对应的是什么）？
  • 很抱歉没有得到准确的问题:) 它在 get :index 行中，它失败了。
  • 我认为它不是 get 本身失败，所以请显示整个回溯。

标签： ruby-on-rails ruby-on-rails-4 rspec rspec-rails pundit


【解决方案1】：

Pundit 的 authorize 方法不应被称为 before_action。 before_action 调用不带参数的方法，authorize 采用模型对象和可选的权限名称。这就是您遇到错误的原因。

您没有显示足够的相关代码让我了解您下一步应该做什么，但我建议让 Pundit 在您的控制器操作中工作，然后再将其拉出到回调中。

这里有一个正确使用authorize的例子：https://github.com/elabs/pundit

【讨论】：

  • 你是对的，错误是因为我使用了 before_action。我对 Devise 有自己的想法，而不是使用 after_action :verify_authorized。非常感谢！
【解决方案2】：

您可以在调用authorize current_user 的控制器中（或者在application_controller 中，如果您将在所有控制器中使用它）定义一个私有辅助方法，然后调用私有方法before_action。像这样：

    private
    def perform_authorization
      authorize current_user
    end

然后将其称为before_action：

    before_action :perform_authorization

【讨论】：

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