找不到 id=#<活动记录：：关系：：ActiveRecord_Relation_User：0x2eb9b58> 的用户

Question

当我点击"编辑"时，我收到此错误：

Couldn't find User with id=#<ActiveRecord::Relation::ActiveRecord_Relation_User:0x2eb9b58> 
ActiveRecord::RecordNotFound in UsersController#edit

这是UsersController：

class UsersController < ApplicationController
  before_action :set_user, only: [:index, :show, :edit, :create, :update, :destroy]
  ...
  def edit
    @user = User.find(params[:id])  #the error points to this line.
  end
  ...
end

完整跟踪如下：

活动记录 (4.0.0( lib/active_record/relation/finder_methods.rb：198：in raise_record_not_found_exception!' activerecord (4.0.0) lib/active_record/relation/finder_methods.rb:284:in find_one' 活动记录 (4.0.0( lib/active_record/relation/finder_methods.rb：268：in find_with_ids' activerecord (4.0.0) lib/active_record/relation/finder_methods.rb:35:in find' 活动记录deprecated_finders (1.0.3( lib/active_record/deprecated_finders/relation.rb：122：in find' C:in 查找' app/controllers/users_controller.rb：18：in edit' actionpack (4.0.0) lib/action_controller/metal/implicit_render.rb:4:in send_action' actionpack (4.0.0( lib/abstract_controller/base.rb：189：in process_action' actionpack (4.0.0) lib/action_controller/metal/rendering.rb:10:in process_action' actionpack (4.0.0( lib/abstract_controller/callbacks.rb：18：in block in process_action' activesupport (4.0.0) lib/active_support/callbacks.rb:413:in run_759441773__process_action__callbacks' activesupport (4.0.0( lib/active_support/callbacks.rb：80：in run_callbacks' actionpack (4.0.0) lib/abstract_controller/callbacks.rb:17:in process_action' Actionpack (4.0.0( lib/action_controller/metal/rescue.rb：29：in process_action' actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:31:in块 process_action' 主动支持 (4.0.0( lib/active_support/notifications.rb：159：in block in instrument' activesupport (4.0.0) lib/active_support/notifications/instrumenter.rb:20:in instrument' activesupport (4.0.0( lib/active_support/notifications.rb：159：in instrument' actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:30:in process_action' 操作包 (4.0.0( lib/action_controller/metal/params_wrapper.rb：245：in process_action' activerecord (4.0.0) lib/active_record/railties/controller_runtime.rb:18:in process_action' Actionpack (4.0.0( lib/abstract_controller/base.rb：136：in process' actionpack (4.0.0) lib/abstract_controller/rendering.rb:44:in process' actionpack (4.0.0( lib/action_controller/metal.rb：195：in dispatch' actionpack (4.0.0) lib/action_controller/metal/rack_delegation.rb:13:in 调度' Actionpack (4.0.0( lib/action_controller/metal.rb：231：in block in action' actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in呼叫操作包 (4.0.0( lib/action_dispatch/routeting/route_set.rb：80：in dispatch' actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:48:in call' actionpack (4.0.0( lib/action_dispatch/journey/router.rb：71：in block in call' actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in每个操作包 (4.0.0( lib/action_dispatch/journey/router.rb：59：in call' actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:655: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 (4.0.0) lib/action_dispatch/middleware/params_parser.rb:27:in call' ActionPack (4.0.0( lib/action_dispatch/middleware/flash.rb：241：in call' rack (1.5.2) lib/rack/session/abstract/id.rb:225:in背景' 机架 (1.5.2( lib/rack/session/abstract/id.rb：220：in call' actionpack (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in调用' activerecord (4.0.0( lib/active_record/query_cache.rb：36：in call' activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in 调用' activerecord (4.0.0( lib/active_record/migration.rb：369：in call' actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:29:in阻止通话' activesupport (4.0.0( lib/active_support/callbacks.rb：373：in _run__847569706__call__callbacks' activesupport (4.0.0) lib/active_support/callbacks.rb:80:in run_callbacks行动包 (4.0.0( lib/action_dispatch/中间件/callbacks.rb：27：in call' actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:in 调用' 操作包 (4.0.0( lib/action_dispatch/middleware/remote_ip.rb：76：in call' actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in 调用' 操作包 (4.0.0( lib/action_dispatch/middleware/show_exceptions.rb：30：in call' railties (4.0.0) lib/rails/rack/logger.rb:38:in call_app' railties (4.0.0( lib/rails/rack/logger.rb：21：in block in call' activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in块在标记' 主动支持 (4.0.0( lib/active_support/tagged_logging.rb：25：in tagged' activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in标记的导轨 (4.0.0( lib/rails/rack/logger.rb：21：in call' actionpack (4.0.0) 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 (4.0.0( lib/active_support/cache/strategy/local_cache.rb：83：in call' rack (1.5.2) lib/rack/lock.rb:17:in调用' Actionpack (4.0.0( lib/action_dispatch/middleware/static.rb：64：in call' railties (4.0.0) lib/rails/engine.rb:511:in call' railties (4.0.0( 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' C：/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb：138：in service' C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in 跑' C：/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb：191：in "阻止start_thread">

Answer 1

查看编辑命令的视图文件，所以edit.html.erb .您可能正在尝试调用联接模型上的某些内容，而不是尝试显示的实际对象。

Answer 2

您正在使用控制器回调集用户进行编辑。 直接使用 @user 而不是再次查找用户对象，否则使用find_by方法User.find_by(id: params[:id])