未定义的方法`user_signed_in？' for＃<projectscontroller：0x007faead1853e0> </projectscontroller：0x007faead1853e0>

Question

我想用Ruby on Rails进行身份验证，每个用户都有自己的帐户。但现在我得到了这个错误：

undefined method user_signed_in? for #<ProjectsController:0x007faead1853e0>

有人能帮助我吗？

以下是代码：

完整跟踪：

app/controllers/projects_controller.rb:69:in `require_login'
activesupport (3.2.3) lib/active_support/callbacks.rb:418:in `_run__2505248868868045404__process_action__114470166732456289__callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.3) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.3) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/params_wrapper.rb:205:in `process_action'
activerecord (3.2.3) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.3) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.3) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.3) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.3) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.3) lib/journey/router.rb:68:in `block in call'
journey (1.0.3) lib/journey/router.rb:56:in `each'
journey (1.0.3) lib/journey/router.rb:56:in `call'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:600:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.3) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.3) lib/active_record/connection_adapters/abstract/connection_pool.rb:467:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `_run__4031929640367205598__call__2058268190974805736__callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.3) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.3) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.3) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.3) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.3) lib/rails/engine.rb:479:in `call'
railties (3.2.3) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.3) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
/Users/sinaoberle/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/Users/sinaoberle/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/Users/sinaoberle/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

projects_controller.rb

class ProjectsController < ApplicationController
  before_filter :require_login
  # GET /projects
  # GET /projects.json
  def index
    @projects = current_user.projects

  end

  # GET /projects/1
  # GET /projects/1.json
  def show
    @projects = current_user.projects.find(params[:id])

  end

  # GET /projects/new
  # GET /projects/new.json
  def new
    @projects = current_user.projects.build

  end

  # GET /projects/1/edit
   def show
    @projects = current_user.projects.find(params[:id])

  end

  # POST /projects
  # POST /projects.json
  def create
    @projects = current_user.projects.build(params[:mytime])
      if @projects.save
         redirect_to projects_path,
            notice: 'Created successfully!'
      else
        render 'new'
      end
     end 

  # PUT /projects/1
  # PUT /projects/1.json
  def update
    @projects = current_user.projects.find(params[:id])
      if @projects.update_attributes(params[:mytime])
        redirect_to projects_path,
            notice: 'Changed successfully!'
      else
        render 'edit'

   end
 end

  # DELETE /projects/1
  # DELETE /projects/1.json
  def destroy
    @projects = current_user.projects.find(params[:id])
    @projects.destroy
    redirect_to projects_url,
        notice: 'Deleted successfully!'

  end
end 

private

def require_login
  unless user_signed_in?
    redirect_to login_path,
    alert: "Please, Sign In first!"
end 
end 

application.html.erb

<!DOCTYPE html>
<html>
<head>
  <title>Test</title>
  <%= stylesheet_link_tag    "application", :media => "all" %>
  <%= javascript_include_tag "application" %>
  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>


  <%= csrf_meta_tags %>
</head>
<body>
<div id="container">

    <div id="content">
        <% if flash[:notice] %>
        <p id="notice">
            <%= flash[:notice] %>
        </p>
        <% end %>

        <% if flash[:alert] %>
        <p id= "alert">
            <%= flash[:alert] %> 
        </p>
        <% end %>
    </div>
    <div id="footer">
    <%= link_to "Sign In", new_user_path %> |
        <% if user_signed_in? %>
        <%= link_to "Logout", logout_path, method: :delete %> |
        <%= link_to "Test", projects_path %>
        <% else %>
        <%= link_to "Login", login_path %>
        <% end %> 
        <%= yield %>
    </div>
</div>
</body>
</html>

的routes.rb

Projects :: Application.routes.draw做

  get "pages/home"

  resources :projects
  resources :users, :only => [:new, :create]
  resources :sessions, :only => [:create]

  get "login" => "sessions#new", as: "login"
  post "sessions" => "sessions#create", as: "sessions"
  delete "logout" => "sessions#destroy", as: "logout"

  root to: 'pages#home'

Answer 1

您是否正在使用设计进行身份验证？我自己没有使用它，但通过查看devise code和documentation看起来你应该在你想要使用帮助器的控制器（或某些父控制器类）中执行before_filter :authenticate_user!比如user_signed_in?。

Answer 2

您是如何生成设计模型的？

就我而言，我以不同的方式生成它。如果你这样生成它：

rails g devise User/Person

然后你应该能够在你的控制器中使用它来确保用户在查看页面之前是signed_in：

注意我使用人而不是用户

before_action :authenticate_person!

要检查他们是否已登录，请执行以下操作：

    <% if person_signed_in? %>
        <p>You are signed in</p>
    <% else %>
        <p>Aww you are not signed in!</p>
    <% end %>

诀窍是要了解这些助手是根据你最初生成Devise模型的方式自动生成的。

在Devise的github中记录：

  

请注意，如果你的Devise模型被称为Member而不是User，那么   例如，可用的助手是：

before_action :authenticate_member!

member_signed_in?

current_member

member_session

https://github.com/plataformatec/devise

注意：

:authenticate_user_person就像我生成的那个不起作用，我不知道为什么它只挑选了最后一部分。如果您不确定，通常错误页面会显示：

“你的意思是#your_devise_model_name_here＃？”

Answer 3

确保安装认证gem设计。方法'user_signed_in？ '不是内置在rails3中。

请参阅Devise: NoMethod Error & user_signed_in