我正在尝试学习如何将 Pundit 与 Rails 4 结合使用。过去 2 年我一直在尝试学习这一点,并且正在慢慢取得一点点进展。
我也在尝试学习如何编写范围。我仍在尝试找出如何将建议翻译成简单的英语,以便我可以开始理解。
我陷入了专家策略使用的范围和我可以在模型中编写的一般范围类的交集。
我有用户、配置文件和项目的模型。
这些协会是:
User
has_one :profile
Profile
belongs_to :user
has_many :projects
Project
belongs_to :profile
我正在尝试编写一个专家策略,允许不同的用户查看不同的项目。我正在编写一个范围内的政策,由专家来管理这个问题。
在我的项目模型中,我试图编写查找所有用户项目的范围。用简单的英语来说,我想搜索所有项目,查找那些配置文件 ID 属于等于当前用户的用户 ID 的项目。
在我的专家政策中,我试图编写这个解析方法:
class Scope
attr_reader :user, :scope
def initialize(user, scope)
@user = user
@scope = scope
end
def resolve
if user.has_role?(:admin)
scope.all
elsif user.id == @project.profile.user_id
scope.projects_for_user
elsif user.present?
scope.in_state(:publish)
else
Project.none
end
end
end
我尝试了大约 100 种不同的方法来尝试在我的项目模型上编写范围来查找属于当前用户的项目。我知道我不能在模型中使用 devise 的 current_user,所以我不能在范围内使用它。这两个是我最好的尝试——都错了。
scope :projects_for_user, -> { joins(:user_id).where('project.profile.user_id = ?', user.id) }
scope :projects_for_user, -> { where(project.profile.user_id: User.id) }
我学习这一点的主要问题是我不知道如何将这条线解构为不同的部分。
据我所知,“:”之前的部分是您正在寻找的东西。 “:”后面的位是您运行作用域时使用的实例。如果这是正确的,那么我对为什么我的第二次尝试不起作用(并且对第一次尝试中的 join 语句也非常困惑)感到困惑。
如果有人可以帮助用简单的英语解释如何编写范围,我相信我知道我想要寻找什么,只是绝望地迷失了如何编写查询来查找它。
目前,当我尝试使用我的项目策略时(我尝试合并下面 Taryn 的建议 - 尽管我不理解范围的每个组成部分,所以我不确定它发生了什么)。
class ProjectPolicy < ApplicationPolicy
attr_reader :user, :record
class Scope
attr_reader :user, :scope
def initialize(user, scope)
@user = user
@scope = scope
end
def resolve
if user.has_role?(:admin)
scope.all
elsif user.id == @project.profile.user_id
scope.projects_for_user(user)
elsif user.present?
scope.in_state(:publish)
else
Project.none
end
end
end
def index?
true
end
def show?
true
end
private
def project
record
end
项目型号:
scope :projects_for_user, -> (user){ joins(:user_id).where('project.profile.user_id = ?', user.id) }
在我的项目控制器中,我有:
class ProjectsController < ApplicationController
before_action :set_project, only: [:show, :edit, :update, :destroy ]
before_action :authenticate_user!
def index
@projects = Project.all
authorize @projects
end
def show
@project = Project.find(params[:id])
# authorize @project
end
private
def set_project
@project = Project.find(params[:id])
authorize @project
end
当我保存并尝试时,它给出了一个错误:
wrong number of arguments (given 2, expected 0)
当我尝试查看项目或特定项目的索引时,会返回此错误(所以我认为这与范围无关)。我不明白给出哪两个论点来知道如何尝试解决这个问题。
添加堆栈跟踪
ArgumentError - wrong number of arguments (given 2, expected 0):
pundit (1.1.0) lib/pundit.rb:112:in `policy!'
pundit (1.1.0) lib/pundit.rb:235:in `policy'
pundit (1.1.0) lib/pundit.rb:194:in `authorize'
app/controllers/eois_controller.rb:20:in `show'
actionpack (4.2.4) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:198:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.2.4) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
activesupport (4.2.4) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
searchkick (1.3.0) lib/searchkick/logging.rb:153:in `process_action'
activerecord (4.2.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:137:in `process'
actionview (4.2.4) lib/action_view/rendering.rb:30:in `process'
actionpack (4.2.4) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.2.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.2.4) lib/action_controller/metal.rb:237:in `block in action'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:76:in `dispatch'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:45:in `serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:43:in `block in serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:30:in `serve'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:821:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
meta_request (0.4.0) lib/meta_request/middlewares/app_request_handler.rb:13:in `call'
meta_request (0.4.0) lib/meta_request/middlewares/meta_request_handler.rb:13:in `call'
warden (1.2.6) lib/warden/manager.rb:35:in `block in call'
warden (1.2.6) lib/warden/manager.rb:34:in `call'
rack (1.6.4) lib/rack/etag.rb:24:in `call'
rack (1.6.4) lib/rack/conditionalget.rb:25:in `call'
rack (1.6.4) lib/rack/head.rb:13:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/flash.rb:260:in `call'
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.2.4) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.2.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
activerecord (4.2.4) lib/active_record/migration.rb:377:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.4) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
better_errors (2.1.1) lib/better_errors/middleware.rb:84:in `protected_app_call'
better_errors (2.1.1) lib/better_errors/middleware.rb:79:in `better_errors_call'
better_errors (2.1.1) lib/better_errors/middleware.rb:57:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
rack-contrib (1.4.0) lib/rack/contrib/response_headers.rb:17:in `call'
meta_request (0.4.0) lib/meta_request/middlewares/headers.rb:16:in `call'
web-console (2.3.0) lib/web_console/middleware.rb:28:in `block in call'
web-console (2.3.0) lib/web_console/middleware.rb:18:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.4) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.4) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.4) lib/rails/rack/logger.rb:20:in `call'
request_store (1.3.1) lib/request_store/middleware.rb:9:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
rack (1.6.4) lib/rack/runtime.rb:18:in `call'
activesupport (4.2.4) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:in `call'
rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
skylight (0.10.6) lib/skylight/middleware.rb:61:in `call'
railties (4.2.4) lib/rails/engine.rb:518:in `call'
railties (4.2.4) lib/rails/application.rb:165:in `call'
rack (1.6.4) lib/rack/content_length.rb:15:in `call'
puma (3.4.0) lib/puma/configuration.rb:224:in `call'
puma (3.4.0) lib/puma/server.rb:569:in `handle_request'
puma (3.4.0) lib/puma/server.rb:406:in `process_client'
puma (3.4.0) lib/puma/server.rb:271:in `block in run'
puma (3.4.0) lib/puma/thread_pool.rb:114:in `block in spawn_thread'
于 2016-09-08 13:23:01 +1000 开始为 ::1 发布“/__better_errors/123578515c1e4e10/variables”
堆栈跟踪分析
我自己编写的唯一一行是 eois 控制器中的授权 @eoi 行(在 show 操作内)。这是使用 pundit 的关键部分。堆栈跟踪的其余部分来自我没有编写且不知道如何更改的内容。
app/controllers/eois_controller.rb:20:in `show'
对可能的重复标签的响应
另一个问题也是我发布的。他们要去不同的地方。在这篇文章中,我想也许我写的范围是错误的(我可能是这样)。在另一篇文章中,我试图列出整个过程,看看是否有人能够帮助我理解我哪里出了问题。