无法将CanCanCan与ActiveAdmin一起使用，并且无法为＃< AdminUser>设计未定义的方法“ dashboards” [英] Unable to use CanCanCan with ActiveAdmin and Devise undefined method `dashboards' for #<AdminUser>

问题描述

我正在使用活动管理员
构建一个管理面板，我已经安装了三个gem

  gem' activeadmin'，github：'activeadmin'
 gem'devise'
 gem'cancancan'
  

我将其设置如下：

  rails g active_admin：install＃使用AdminUser Model创建了一个不错的管理面板
 rails generate active_admin：resource MyModel＃添加了我所有的模型
  

config / active_admin.rb

  config.authorization_adapter = ActiveAdmin :: CanCanAdapter 
 config.cancan_ability_class =能力
 config.authentication_method =：authenticate_admin_user！ 
  

ability.rb

 类能力
包括CanCan :: Ability 
 
 def initialize（user）
 if user.admin？ 
可以：read，ActiveAdmin :: Page，：name => 仪表板 
否则
可以：read，ActiveAdmin :: Page，：name => 仪表板 
结束
结束
结束
  

为我为活动管理员生成的所有资源模型，都使用表格形式定义了不错的自定义方法，例如索引，显示，编辑等方法。

例如，我的管理员/仪表板.rb

  ActiveAdmin.register_page控制台执行
 
菜单优先级：1，标签：proc { I18n.t（ active_admin.dashboard）} 
 
＃一些显示
内容标题的表：proc {I18n.t（ active_admin.dashboard）}进行
 div类： blank_slate_container，id： dashboard_default_message执行
列执行
列执行
面板最新访问者执行
＃table_for Visitor（'id desc'）。limit（ 10）执行
 table_for Patient.order（ id desc）。limit（10）执行
列（：name）
列（：mobile）
结束
结束
结束
结束＃列
结束
 zh d＃内容
 
控制器执行
＃before_action：authenticate_admin_user！ 
 load_and_authorize_resource：through => ：current_admin_user 
结束
 
结束
  

如果我将 load_and_authorize_resource 注释掉，这是一个不错的登录系统，它在成功登录的详细信息上显示仪表板。
但是，当我使用 load_and_authorize_resource时，加载 https：// mywebsite / admin 时会引发错误

  NoMethodError Admin :: DashboardController＃index 
 undefined method'dashboards for＃< AdminUser：0x007f0afd642878> 
  

initial方法似乎工作正常。但是它不能以某种方式正确地重定向回仪表板。
我没有专门使用devise，但是当我最初运行 rails g active_admin：install 时，设置 activeadmin ，它会根据主动管理文档自动使用dev。

更新堆栈跟踪：

 通过Admin :: DashboardController＃index作为HTML处理
 AdminUser负载（50.8ms）选择 admin_users。*从 admin_users在 admin_users 。 id = $ 1 ORDER BY admin_users。 id ASC LIMIT $ 2 [[ id，2]，[ LIMIT，1]] 
在106毫秒内完成了500个内部服务器错误（ActiveRecord：50.8） ms）
 
 
 
 NoMethodError（＃< AdminUser：0x000000063c4fa0>的未定义方法'dashboard'）：
 
 activemodel（5.0.6）lib /active_model/attribute_methods.rb:433：在`method_missing'中
 cancancan（2.0.0）lib / cancan / controller_resource.rb：201：在`resource_base_through'中
 cancancan（2.0.0）lib / cancan /controller_resource.rb:190:in`resource_base'
 cancancan（2.0.0）l ib / cancan / controller_resource.rb：72：在`load_collection？'中
 cancancan（2.0.0）lib / cancan / controller_resource.rb：36：在`load_resource'
 cancancan（2.0.0）lib中/cancan/controller_resource.rb:28：在`load_and_authorize_resource'中
 cancancan（2.0.0）lib / cancan / controller_resource.rb：12：在`block in add_before_action'
 activesupport（5.0.6）lib中/active_support/callbacks.rb:398:in`instance_exec'
 activesupport（5.0.6）lib / active_support / callbacks.rb：398：in`block in make_lambda'
 activesupport（5.0.6）lib /active_support/callbacks.rb:169：在'block（2个级别）中止'
 actionpack（5.0.6）lib / abstract_controller / callbacks.rb：12：in在'block（2个级别）中<模块：callbacks>'
 activesupport（5.0.6）lib / active_support / callbacks.rb：170：在'阻止暂停'
 activesupport（5.0.6）lib / active_support / callbacks.rb：454：在'通话中阻止'
 activesupport（5.0.6）lib / active_support / callbacks.rb：454：在`每个'
 activesupport（5.0.6）lib / active_support / callbacks.r中b：454：in`call'
 activesupport（5.0.6）lib / active_support / callbacks.rb：101：in`__run_callbacks__'
 activesupport（5.0.6）lib / active_support / callbacks.rb： 750：在`_run_process_action_callbacks'中
 activesupport（5.0.6）lib / active_support / callbacks.rb：90：在`run_callbacks'中
 actionpack（5.0.6）lib / abstract_controller / callbacks.rb：19：在`process_action'
 actionpack（5.0.6）lib / action_controller / metal / rescue.rb：20：在`process_action'
 actionpack（5.0.6）lib / action_controller / metal / instrumentation.rb： 32：在'process_action'中的块
 activesupport（5.0.6）lib / active_support / notifications.rb：164：在`工具中的块中
 activesupport（5.0.6）lib / active_support / notifications / instrumenter.rb：21：在'instrument'中
 activesupport（5.0.6）lib / active_support / notifications.rb：164：在`instrument'
 actionpack（5.0.6）lib / action_controller / metal / instrumentation.rb：30：在`process_action'
 actionpack（5.0.6）lib / action_controller / metal / params_wrapper.rb：248：在`proce ss_action'
 activerecord（5.0.6）lib / active_record / railties / controller_runtime.rb：18：在'process_action'
 actionpack（5.0.6）lib / abstract_controller / base.rb：126：in` process'
 actionview（5.0.6）lib / action_view / rendering.rb：30：在'process'
 actionpack（5.0.6）lib / action_controller / metal.rb：190：在Dispatch中
 actionpack（5.0.6）lib / action_controller / metal.rb：262：在`dispatch'中
 actionpack（5.0.6）lib / action_dispatch / routing / route_set.rb：50：in`dispatch' 
 actionpack（5.0.6）lib / action_dispatch / routing / route_set.rb：32：in`serve'
 actionpack（5.0.6）lib / action_dispatch / journey / router.rb：39：in`在发球的
 actionpack（5.0.6）lib / action_dispatch / journey / router.rb中阻止：26：在`each'
 actionpack（5.0.6）lib / action_dispatch / journey / router.rb中： 26：在`serve'
 actionpack（5.0.6）lib / action_dispatch / routing / route_set.rb：727：在`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in`call'
 newrelic_rpm（4.5.0.3 37）lib / new_relic / rack / agent_hooks.rb：30：在`traced_call'中
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'中
 newrelic_rpm（4.5.0.337）lib / new_relic / rack / browser_monitoring.rb：32：在`traced_call'中
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'中
监护人（1.2.7）lib / warden / manager.rb：36：in在'通话中'
监护人（1.2.7）lib / warden / manager.rb：35：in`catch' 
管理员（1.2.7）lib / warden / manager.rb：35：在`call'中
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in`调用'
机架（2.0.3）lib / rack / etag.rb：25：在'调用'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'
机架（2.0.3）lib / rack / conditional_get.rb：25中：在`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb中： 92：在`call'
 rack（2.0.3）lib / rack / head.rb：12：在`call'
 newrelic_rp m（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in`call'
 rack（2.0.3）lib / rack / session / abstract / id.rb：232：in` context'
机架（2.0.3）lib / rack / session / abstract / id.rb：226：in'call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing。 rb：92：in'call'
 actionpack（5.0.6）lib / action_dispatch / middleware / cookies.rb：613：in`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在'call'
 activerecord（5.0.6）lib / active_record / migration.rb：553：在'call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in'call'
 actionpack（5.0.6）lib / action_dispatch / middleware / callbacks.rb：38：in`block in call'
 activesupport（5.0。 6）lib / active_support / callbacks.rb：97：在__run_callbacks__中
 activesupport（5.0.6）lib / active_support / callbacks.rb：750：在`_run_call_callbacks'
 activesupport中（5.0.6） lib / active_support / callbacks.rb：90：in`r un_callbacks的
 actionpack（5.0.6）lib / action_dispatch / middleware / callbacks.rb：36：in`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb： 92：在`call'
 actionpack（5.0.6）lib / action_dispatch / middleware / executor.rb：12：在`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'
 actionpack（5.0.6）lib / action_dispatch / middleware / remote_ip.rb：79：在`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in'call'
 better_errors（2.4.0）lib / better_errors / middleware.rb：59：in`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in`call'
 actionpack（5.0.6）lib / action_dispatch / middleware / debug_exceptions.rb：49：in`call'
 newrelic_rpm（4.5。 0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in`call'
网络控制台（3.5.1）lib / web_console / middleware.rb：135：in`call_app'
w eb-console（3.5.1）lib / web_console / middleware.rb：20：in在通话中
 web-console（3.5.1）lib / web_console / middleware.rb：18：在catch中
 Web控制台（3.5.1）lib / web_console / middleware.rb：18：在`call'中
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'
 actionpack（5.0.6）lib / action_dispatch / middleware / show_exceptions.rb：31：在`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing中。 rb：92：in`call'
铁路（5.0.6）lib / rails / rack / logger.rb：36：in`call'
铁路（5.0.6）lib / rails / rack / logger.rb：24：in在``阻止通话中''
 activesupport（5.0.6）lib / active_support / tagged_logging.rb：69：in在``阻止在标签中''
 activesupport（5.0.6）lib / active_support / tagged_logging.rb：26：在'tagged'
 activesupport（5.0.6）lib / active_support / tagged_logging.rb：69：in'tagged'
铁路（5.0.6）lib / rails / rack / logger.rb：24：in`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentatio n / middleware_tracing.rb：92：在'call'
链轮轨道（3.2.1）lib / sprockets / rails / quiet_assets.rb：13：在'call'
 newrelic_rpm（4.5.0.337） lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in`call'
 actionpack（5.0.6）lib / action_dispatch / middleware / request_id.rb：24：in`call'
 newrelic_rpm（ 4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'
机架（2.0.3）lib / rack / method_override.rb：22：在`call'
中newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在'call'
机架（2.0.3）lib / rack / runtime.rb：22：在'call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在'call'中
 activesupport（5.0.6）lib / active_support / cache / strategy / local_cache_middleware.rb：28：在`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92中：在`call'
 actionpack（5.0.6）lib / action_dispatch / middleware / executor中。 rb：12：in`call'
新relic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'中
 actionpack（5.0.6）lib / action_dispatch / middleware / static.rb：136：在`call'中
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：in`call'
机架（2.0.3）lib / rack / sendfile.rb：111：in`调用'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在'调用'
的Railties（5.0.6）lib / rails / engine.rb：522中：在`call'
 newrelic_rpm（4.5.0.337）lib / new_relic / agent / instrumentation / middleware_tracing.rb：92：在`call'
 puma（3.10.0）lib / puma / configuration.rb： 225：in`call'
 puma（3.10.0）lib / puma / server.rb：605：in`handle_request'
 puma（3.10.0）lib / puma / server.rb：437：在`process_client'
 puma（3.10.0）lib / puma / server.rb：301：在`运行中阻止
 puma（3.10.0）lib / puma / thread_pool.rb：120：在`spawn_thread中的块'
中渲染/usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middlewar e / templates / rescues / diagnostics.html.erb在救援/布局中
渲染/usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates /rescues/_source.html.erb 
呈现/usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html。 erb（4.6ms）
渲染/usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb 
渲染/usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb（2.2ms）
渲染/usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb 
呈现的/ usr / local / rvm / gems / ruby​​-2.3.4 / gems / actionpack-5.0.6 / lib / action_dispatch / middleware / templates / rescues / _request_and_response.html.erb（1.0ms）
呈现/ usr / local / rvm / gems / ruby -2.3.4 / gems / actionpack-5.0.6 / lib / a救援/布局中的ction_dispatch / middleware / templates / rescues / diagnostics.html.erb（35.2ms）
  

解决方案

如果您遵循步骤，将 Cancancan 与 ActiveAdmin 集成在一起，那么您只需要扩展 Ability使用所需的用户角色#initialize

 ＃应用程序/模型/功能。 rb 
 
 def initialize（user）
如果user.admin？ 
可以：manage，：all 
 elsif user.product_manager吗？ 
 can：manage，Product 
 can：read，ActiveAdmin :: Page，name：'Dashboard'
 end 
 end 
   
 
 
无需在每个控制器中调用 load_and_authorize_resource ！
 
I'm constructing an admin panel with active admin 
I've installed the three gems
gem 'activeadmin', github: 'activeadmin'
gem 'devise'
gem 'cancancan'
I set it up as follows: 
rails g active_admin:install # Created a nice admin panel, with AdminUser Model
rails generate active_admin:resource MyModel # Added all my models
config/active_admin.rb
config.authorization_adapter = ActiveAdmin::CanCanAdapter
config.cancan_ability_class = Ability
config.authentication_method = :authenticate_admin_user!  
ability.rb
class Ability
  include CanCan::Ability

  def initialize(user)
    if user.admin?
      can :read, ActiveAdmin::Page, :name => "Dashboard"
    else
      can :read, ActiveAdmin::Page, :name => "Dashboard"
    end
  end
end
and I also defined nice custom methods using formtastic, like index, show, edit, etc. methods for all my resource models I generated for active admin.

For example, my admin/dashboard.rb
ActiveAdmin.register_page "Dashboard" do

  menu priority: 1, label: proc{ I18n.t("active_admin.dashboard") }

  # some tables to display
  content title: proc{ I18n.t("active_admin.dashboard") } do
    div class: "blank_slate_container", id: "dashboard_default_message" do
      columns do
        column do
          panel "Latest Visitors" do
            # table_for Visitor('id desc').limit(10) do
            table_for Patient.order("id desc").limit(10) do
              column(:name) 
              column(:mobile)
            end
          end
        end
      end # columns
    end
  end # content

  controller do
    # before_action :authenticate_admin_user!   
    load_and_authorize_resource :through => :current_admin_user
  end

end
The app runs fine if I comment out load_and_authorize_resource, a nice login system, which shows dashboard on successful log in details.
But when I use "load_and_authorize_resource", it throws an error when I load https://mywebsite/admin saying
NoMethodError in Admin::DashboardController#index
undefined method `dashboards' for #<AdminUser:0x007f0afd642878>
The method initialize seems to be working fine. But it somehow doesn't redirect back properly to the dashboard.
I didn't specifically use devise, but when I ran rails g active_admin:install initially, when setting up activeadmin, it automatically used devise, done as per the activeadmin documentation.

Update Stack trace:
Processing by Admin::DashboardController#index as HTML
  AdminUser Load (50.8ms)  SELECT  "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = $1 ORDER BY "admin_users"."id" ASC LIMIT $2  [["id", 2], ["LIMIT", 1]]
Completed 500 Internal Server Error in 106ms (ActiveRecord: 50.8ms)



NoMethodError (undefined method `dashboards' for #<AdminUser:0x000000063c4fa0>):

activemodel (5.0.6) lib/active_model/attribute_methods.rb:433:in `method_missing'
cancancan (2.0.0) lib/cancan/controller_resource.rb:201:in `resource_base_through'
cancancan (2.0.0) lib/cancan/controller_resource.rb:190:in `resource_base'
cancancan (2.0.0) lib/cancan/controller_resource.rb:72:in `load_collection?'
cancancan (2.0.0) lib/cancan/controller_resource.rb:36:in `load_resource'
cancancan (2.0.0) lib/cancan/controller_resource.rb:28:in `load_and_authorize_resource'
cancancan (2.0.0) lib/cancan/controller_resource.rb:12:in `block in add_before_action'
activesupport (5.0.6) lib/active_support/callbacks.rb:398:in `instance_exec'
activesupport (5.0.6) lib/active_support/callbacks.rb:398:in `block in make_lambda'
activesupport (5.0.6) lib/active_support/callbacks.rb:169:in `block (2 levels) in halting'
actionpack (5.0.6) lib/abstract_controller/callbacks.rb:12:in `block (2 levels) in <module:Callbacks>'
activesupport (5.0.6) lib/active_support/callbacks.rb:170:in `block in halting'
activesupport (5.0.6) lib/active_support/callbacks.rb:454:in `block in call'
activesupport (5.0.6) lib/active_support/callbacks.rb:454:in `each'
activesupport (5.0.6) lib/active_support/callbacks.rb:454:in `call'
activesupport (5.0.6) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
activesupport (5.0.6) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks'
activesupport (5.0.6) lib/active_support/callbacks.rb:90:in `run_callbacks'
actionpack (5.0.6) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (5.0.6) lib/action_controller/metal/rescue.rb:20:in `process_action'
actionpack (5.0.6) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (5.0.6) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (5.0.6) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (5.0.6) lib/active_support/notifications.rb:164:in `instrument'
actionpack (5.0.6) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (5.0.6) lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
activerecord (5.0.6) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (5.0.6) lib/abstract_controller/base.rb:126:in `process'
actionview (5.0.6) lib/action_view/rendering.rb:30:in `process'
actionpack (5.0.6) lib/action_controller/metal.rb:190:in `dispatch'
actionpack (5.0.6) lib/action_controller/metal.rb:262:in `dispatch'
actionpack (5.0.6) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
actionpack (5.0.6) lib/action_dispatch/routing/route_set.rb:32:in `serve'
actionpack (5.0.6) lib/action_dispatch/journey/router.rb:39:in `block in serve'
actionpack (5.0.6) lib/action_dispatch/journey/router.rb:26:in `each'
actionpack (5.0.6) lib/action_dispatch/journey/router.rb:26:in `serve'
actionpack (5.0.6) lib/action_dispatch/routing/route_set.rb:727:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/rack/agent_hooks.rb:30:in `traced_call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/rack/browser_monitoring.rb:32:in `traced_call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
warden (1.2.7) lib/warden/manager.rb:36:in `block in call'
warden (1.2.7) lib/warden/manager.rb:35:in `catch'
warden (1.2.7) lib/warden/manager.rb:35:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
rack (2.0.3) lib/rack/etag.rb:25:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
rack (2.0.3) lib/rack/conditional_get.rb:25:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
rack (2.0.3) lib/rack/head.rb:12:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
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rack (2.0.3) lib/rack/session/abstract/id.rb:226:in `call'
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railties (5.0.6) lib/rails/rack/logger.rb:24:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
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newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
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newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
railties (5.0.6) lib/rails/engine.rb:522:in `call'
newrelic_rpm (4.5.0.337) lib/new_relic/agent/instrumentation/middleware_tracing.rb:92:in `call'
puma (3.10.0) lib/puma/configuration.rb:225:in `call'
puma (3.10.0) lib/puma/server.rb:605:in `handle_request'
puma (3.10.0) lib/puma/server.rb:437:in `process_client'
puma (3.10.0) lib/puma/server.rb:301:in `block in run'
puma (3.10.0) lib/puma/thread_pool.rb:120:in `block in spawn_thread'
  Rendering /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout
  Rendering /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (4.6ms)
  Rendering /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.2ms)
  Rendering /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.0ms)
  Rendered /usr/local/rvm/gems/ruby-2.3.4/gems/actionpack-5.0.6/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (35.2ms)

解决方案
If you follow the steps for integrating Cancancan with ActiveAdmin, then you just have to extend Ability#initialize with your user roles as you need like so:
# app/models/ability.rb

def initialize(user)
  if user.admin?
    can :manage, :all
  elsif user.product_manager?
    can :manage, Product
    can :read, ActiveAdmin::Page, name: 'Dashboard'
  end
end
No need to invoke load_and_authorize_resource in each controller!

                        
这篇关于无法将CanCanCan与ActiveAdmin一起使用，并且无法为＃&lt; AdminUser&gt;设计未定义的方法“ dashboards”的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！