ruby-on-rails - Rails/Pundit ArgumentError

Question

演習では、投稿を更新するために出席してログインすることに加えて、ユーザーが投稿の所有者または一般管理者のいずれかである必要があるような承認を作成しようとしています。専門家ポリシーを実装しようとしています(認証に Devise を使用)。

PostController クラス:

class PostsController < ApplicationController
  ...
  def edit
    @post = Post.find(params[:id])
    authorize @post
  end
  ...
end

ApplicationPolicy クラス:

class ApplicationPolicy
  attr_reader :user, :record
  def initialize(user, record)
    @user = user
    @record = record
  end
  ...
  def update?
    user.present? && (record.user == user || user.role?(:admin))
  end
  def edit?
    update?
  end
  def destroy?
    update?
  end
  ...
end

* ユーザーモデル* :

  class User < ActiveRecord::Base
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable and :omniauthable
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :trackable, :validatable, :confirmable
   has_many :posts
   def role?(base_role)
     role == base_role.to_s
   end
 end

Argument Error: で行き詰まりましたwrong number of arguments (2 for 1)。私の理解では、ポリシーメソッドはモジュールの一部であり、指定されたレコードと暗黙のユーザーとしてPundit新しいポリシーオブジェクトを初期化して返します。current_user誰かがこの問題に光を当てるのを手伝ってもらえますか?

エラーメッセージ:

行番号 3 が発生した /home/vagrant/code/bloccit/app/views/posts/show.html.erb の表示:

<h1><%= @post.title %></h1>

 <% if policy(@post).edit? %> #This is the line where the error is raised.
 <%= link_to "Edit", edit_post_path(@post), class: 'btn btn-success' %>
<% end %>

引数の数が間違っています (1 に対して 2)

完全なエラートレース:

activerecord (4.0.10) lib/active_record/attribute_methods/query.rb:35:in `attribute?'
activemodel (4.0.10) lib/active_model/attribute_methods.rb:383:in `role?'
app/policies/application_policy.rb:26:in `update?'
app/policies/application_policy.rb:30:in `edit?'
app/views/posts/show.html.erb:3:in `_app_views_posts_show_html_erb__322214668_90107450'
actionpack (4.0.10) lib/action_view/template.rb:143:in `block in render'
activesupport (4.0.10) lib/active_support/notifications.rb:161:in `instrument'
actionpack (4.0.10) lib/action_view/template.rb:141:in `render'
actionpack (4.0.10) lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in render_template'
actionpack (4.0.10) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (4.0.10) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.0.10) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.0.10) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.0.10) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (4.0.10) lib/action_view/renderer/template_renderer.rb:48:in `block in render_template'
actionpack (4.0.10) lib/action_view/renderer/template_renderer.rb:56:in `render_with_layout'
actionpack (4.0.10) lib/action_view/renderer/template_renderer.rb:47:in `render_template'
actionpack (4.0.10) lib/action_view/renderer/template_renderer.rb:17:in `render'
actionpack (4.0.10) lib/action_view/renderer/renderer.rb:42:in `render_template'
actionpack (4.0.10) lib/action_view/renderer/renderer.rb:23:in `render'
actionpack (4.0.10) lib/abstract_controller/rendering.rb:127:in `_render_template'
actionpack (4.0.10) lib/action_controller/metal/streaming.rb:219:in `_render_template'
actionpack (4.0.10) lib/abstract_controller/rendering.rb:120:in `render_to_body'
actionpack (4.0.10) lib/action_controller/metal/rendering.rb:33:in `render_to_body'
actionpack (4.0.10) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
actionpack (4.0.10) lib/abstract_controller/rendering.rb:97:in `render'
actionpack (4.0.10) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (4.0.10) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
activesupport (4.0.10) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/home/vagrant/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
activesupport (4.0.10) lib/active_support/core_ext/benchmark.rb:12:in `ms'
actionpack (4.0.10) lib/action_controller/metal/instrumentation.rb:41:in `block in render'
actionpack (4.0.10) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
activerecord (4.0.10) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
actionpack (4.0.10) lib/action_controller/metal/instrumentation.rb:40:in `render'
actionpack (4.0.10) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (4.0.10) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
actionpack (4.0.10) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.0.10) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.0.10) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (4.0.10) lib/active_support/callbacks.rb:413:in `_run__423379461__process_action__callbacks'
activesupport (4.0.10) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.10) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (4.0.10) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.0.10) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.0.10) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.0.10) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.0.10) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.0.10) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.0.10) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.0.10) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.0.10) lib/abstract_controller/base.rb:136:in `process'
actionpack (4.0.10) lib/abstract_controller/rendering.rb:44:in `process'
actionpack (4.0.10) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.0.10) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.0.10) lib/action_controller/metal.rb:231:in `block in action'
actionpack (4.0.10) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.0.10) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.0.10) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.0.10) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.0.10) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.0.10) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.0.10) lib/action_dispatch/routing/route_set.rb:676:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/flash.rb:241:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/cookies.rb:486:in `call'
activerecord (4.0.10) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.0.10) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
activerecord (4.0.10) lib/active_record/migration.rb:373:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.0.10) lib/active_support/callbacks.rb:373:in `_run__474745028__call__callbacks'
activesupport (4.0.10) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.10) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/reloader.rb:64:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.0.10) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.0.10) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.0.10) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.0.10) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.0.10) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.0.10) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.0.10) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.0.10) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.0.10) lib/rails/engine.rb:511:in `call'
railties (4.0.10) lib/rails/application.rb:97:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/home/vagrant/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
/home/vagrant/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
/home/vagrant/.rvm/rubies/ruby-2.0.0-p576/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'

score 1 · Accepted Answer

エラートレースの最初の 2 ～ 3 行は、問題がとにあることを示していApplicationPolicy#update?ますUser#role?。

activerecord (4.0.10) lib/active_record/attribute_methods/query.rb:35:in attribute?'
activemodel (4.0.10) lib/active_model/attribute_methods.rb:383:in role?'
app/policies/application_policy.rb:26:in update?'

問題のコードを見る：

class ApplicationPolicy
  ...

  def update?
    user.present? && (record.user == user || user.role?(:admin))
  end

  ...
end

以下のことを試してみてください。

CheckUserにはrole?メソッドが定義されています。
小切手User#role?が見つかり、呼び出されています。確実にするために、ロギングまたはraise "In User#role?"ステートメントをメソッドに挿入します。
rake db:migrateおよびrake db:migrate RAILS_ENV=testタスクを実行して、開発環境とテスト環境で db 移行が実行されていることを確認します。
サーバーを再起動しますrails s

ruby-on-rails - Rails/Pundit ArgumentError

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