那些遇到过的问题

Ruby on Rails：url_for :back 导致 back_url 的 NoMethodError

Pla*_*ure 5 ruby-on-rails url-for

我正在尝试使用 url_for(:back) 创建一个在用户登录后返回上一页的重定向。

当用户自己进入登录页面时，我已经成功地使用了它。然而，当用户由于访问要求用户进行身份验证的页面而被重定向到登录页面时，重定向会将用户发送回他/她尝试访问权限不足的页面之前的页面。

我正在尝试修改我的登录控制器操作以正确处理重定向。我的计划是在发生强制重定向时使用一个查询字符串参数“重定向”。在控制器中，如果该参数存在，则使用该 URL；否则，将使用 url_for(:back)，或者如果这不起作用（由于缺少 HTTP_REFERER），则用户将被重定向到站点的主页。

这是应该实现此逻辑的代码片段：

if params[:redirect]
  @url = params[:redirect]
else
  @url = url_for :back
  @url ||= url_for :controller => "home", :action => "index"
end
Run Code Online (Sandbox Code Playgroud)

我得到的错误是：

用户控制器中的 NoMethodError#login

#的未定义方法`back_url'

RAILS_ROOT：[模糊]
应用程序跟踪 | 框架跟踪 | 完整跟踪

供应商/rails/actionpack/lib/action_controller/polymorphic_routes.rb:112:in`__send__'
供应商/rails/actionpack/lib/action_controller/polymorphic_routes.rb:112:in`polymorphic_url'
供应商/rails/actionpack/lib/action_controller/base.rb:628:in `url_for'
app/controllers/users_controller.rb:16:in`登录'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:76:in `process'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `synchronize'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `process'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in`process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in`process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in`初始化'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in`初始化'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `each'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281

供应商/rails/actionpack/lib/action_controller/polymorphic_routes.rb:112:in`__send__'
供应商/rails/actionpack/lib/action_controller/polymorphic_routes.rb:112:in`polymorphic_url'
供应商/rails/actionpack/lib/action_controller/base.rb:628:in `url_for'
供应商/rails/actionpack/lib/action_controller/base.rb:1256:in`send'
vendor/rails/actionpack/lib/action_controller/base.rb:1256:in`perform_action_without_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:617:in`call_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:610:in`perform_action_without_benchmark'
供应商/rails/actionpack/lib/action_controller/benchmarking.rb:68:in`perform_action_without_rescue'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
供应商/rails/actionpack/lib/action_controller/benchmarking.rb:68:in`perform_action_without_rescue'
供应商/rails/actionpack/lib/action_controller/rescue.rb:136:in`perform_action_without_caching'
供应商/rails/actionpack/lib/action_controller/caching/sql_cache.rb:13:in`perform_action'
供应商/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
供应商/rails/activerecord/lib/active_record/query_cache.rb:8:in `cache'
供应商/rails/actionpack/lib/action_controller/caching/sql_cache.rb:12:in`perform_action'
供应商/rails/actionpack/lib/action_controller/base.rb:524:in `send'
vendor/rails/actionpack/lib/action_controller/base.rb:524:in `process_without_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:606:in `process_without_session_management_support'
vendor/rails/actionpack/lib/action_controller/session_management.rb:134:in `process'
vendor/rails/actionpack/lib/action_controller/base.rb:392:in `process'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:184:in`handle_request'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:112:in`dispatch_unlocked'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:125:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:124:in`synchronize'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:124:in `dispatch'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:134:in`dispatch_cgi'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:41:in `dispatch'
vendor/rails/activesupport/lib/active_support/dependencies.rb:142:in `load_without_new_constant_marking'
vendor/rails/activesupport/lib/active_support/dependencies.rb:142:in`load'
vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in`new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:142:in`load'
供应商/rails/railties/lib/commands/servers/mongrel.rb:64
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in`require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in`new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in`require'
供应商/rails/railties/lib/commands/server.rb:49
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
脚本/服务器：3

供应商/rails/actionpack/lib/action_controller/polymorphic_routes.rb:112:in`__send__'
供应商/rails/actionpack/lib/action_controller/polymorphic_routes.rb:112:in`polymorphic_url'
供应商/rails/actionpack/lib/action_controller/base.rb:628:in `url_for'
app/controllers/users_controller.rb:16:in`登录'
供应商/rails/actionpack/lib/action_controller/base.rb:1256:in`send'
vendor/rails/actionpack/lib/action_controller/base.rb:1256:in`perform_action_without_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:617:in`call_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:610:in`perform_action_without_benchmark'
供应商/rails/actionpack/lib/action_controller/benchmarking.rb:68:in`perform_action_without_rescue'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
供应商/rails/actionpack/lib/action_controller/benchmarking.rb:68:in`perform_action_without_rescue'
供应商/rails/actionpack/lib/action_controller/rescue.rb:136:in`perform_action_without_caching'
供应商/rails/actionpack/lib/action_controller/caching/sql_cache.rb:13:in`perform_action'
供应商/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
供应商/rails/activerecord/lib/active_record/query_cache.rb:8:in `cache'
供应商/rails/actionpack/lib/action_controller/caching/sql_cache.rb:12:in`perform_action'
供应商/rails/actionpack/lib/action_controller/base.rb:524:in `send'
vendor/rails/actionpack/lib/action_controller/base.rb:524:in `process_without_filters'
vendor/rails/actionpack/lib/action_controller/filters.rb:606:in `process_without_session_management_support'
vendor/rails/actionpack/lib/action_controller/session_management.rb:134:in `process'
vendor/rails/actionpack/lib/action_controller/base.rb:392:in `process'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:184:in`handle_request'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:112:in`dispatch_unlocked'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:125:in `dispatch'
vendor/rails/actionpack/lib/action_controller/dispatcher.rb:124:in`synchronize'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:124:in `dispatch'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:134:in`dispatch_cgi'
供应商/rails/actionpack/lib/action_controller/dispatcher.rb:41:in `dispatch'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:76:in `process'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `synchronize'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `process'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in`process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in`process_client'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in`初始化'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in`初始化'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `each'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in `run'
/var/lib/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
vendor/rails/activesupport/lib/active_support/dependencies.rb:142:in `load_without_new_constant_marking'
vendor/rails/activesupport/lib/active_support/dependencies.rb:142:in`load'
vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in`new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:142:in`load'
供应商/rails/railties/lib/commands/servers/mongrel.rb:64
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in`require'
vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in`new_constants_in'
vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in`require'
供应商/rails/railties/lib/commands/server.rb:49
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
脚本/服务器：3

要求

参数：

没有任何

显示会话转储

--- 
：用户： 
:csrf_id: 2927cca61bbbe97218362b5bcdb74c0f
flash: !map:ActionController::Flash::FlashHash {}


回复

标题：

{"内容类型"=>"",
 "cookie"=>[],
 “缓存控制”=>“无缓存”}

请记住，我之前已经让它工作了—— url_for(:back) 在我添加这个逻辑之前就知道如何正确操作。

提前感谢您的任何想法！

irk*_*der 4

您正在尝试在控制器中使用视图辅助方法。您期望的行为位于 ActionView::Helpers::UrlHelper 中，但您调用的方法位于 ActionController::Base 中。不幸的是，这两种方法的名称相同，功能也非常相似，但并不完全相同。

为了快速修复，ActionController::Base 设置一个@template可以访问所有 ActionView 助手的变量。尝试url_for从该对象调用，如下所示：

if params[:redirect]
  @url = params[:redirect]
else
  @url = @template.url_for :back
  @url ||= url_for :controller => "home", :action => "index"
end
Run Code Online (Sandbox Code Playgroud)

然而，我不确定这是否是“正确”的方法。@template如果 Rails 开发人员希望我们随意使用该变量，他们会更多地宣传它。

获取原始引荐来源网址（您正在寻找的 :back）的 URL 的另一种方法是使用以下方法request：

if params[:redirect]
  @url = params[:redirect]
else
  @url = request.env["HTTP_REFERER"]
  @url ||= url_for :controller => "home", :action => "index"
end
Run Code Online (Sandbox Code Playgroud)

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