此前我们可以这样做：
但现在，当包含多个标签时该功能已无法使用。我猜测这个错误是最近一次版本更新中引入的，还是说格式已经发生了变化？
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看起来问题只出现在某些类别中——在 /logs 中可以看到大量此类错误：
info:
NoMethodError (undefined method `name' for nil:NilClass)
app/models/topic_list.rb:74:in `preload_key'
lib/topic_list_responder.rb:12:in `block (2 levels) in respond_with_list'
lib/topic_list_responder.rb:9:in `respond_with_list'
app/controllers/list_controller.rb:102:in `block (2 levels) in <class:ListController>'
app/controllers/application_controller.rb:358:in `block in with_resolved_locale'
app/controllers/application_controller.rb:358:in `with_resolved_locale'
lib/middleware/omniauth_bypass_middleware.rb:68:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:355:in `call'
config/initializers/100-quiet_logger.rb:23:in `call'
config/initializers/100-silence_logger.rb:31:in `call'
lib/middleware/enforce_hostname.rb:23:in `call'
lib/middleware/request_tracker.rb:177:in `call'
backtrace:
app/models/topic_list.rb:74:in `preload_key'
lib/topic_list_responder.rb:12:in `block (2 levels) in respond_with_list'
actionpack (6.0.3.5) lib/action_controller/metal/mime_responds.rb:214:in `respond_to'
lib/topic_list_responder.rb:9:in `respond_with_list'
app/controllers/list_controller.rb:102:in `block (2 levels) in <class:ListController>'
actionpack (6.0.3.5) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (6.0.3.5) lib/abstract_controller/base.rb:195:in `process_action'
actionpack (6.0.3.5) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (6.0.3.5) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport (6.0.3.5) lib/active_support/callbacks.rb:112:in `block in run_callbacks'
app/controllers/application_controller.rb:358:in `block in with_resolved_locale'
i18n (1.8.9) lib/i18n.rb:314:in `with_locale'
app/controllers/application_controller.rb:358:in `with_resolved_locale'
activesupport (6.0.3.5) lib/active_support/callbacks.rb:121:in `block in run_callbacks'
activesupport (6.0.3.5) lib/active_support/callbacks.rb:139:in `run_callbacks'
actionpack (6.0.3.5) lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack (6.0.3.5) lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack (6.0.3.5) lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'
activesupport (6.0.3.5) lib/active_support/notifications.rb:180:in `block in instrument'
activesupport (6.0.3.5) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport (6.0.3.5) lib/active_support/notifications.rb:180:in `instrument'
actionpack (6.0.3.5) lib/action_controller/metal/instrumentation.rb:32:in `process_action'
actionpack (6.0.3.5) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
activerecord (6.0.3.5) lib/active_record/railties/controller_runtime.rb:27:in `process_action'
actionpack (6.0.3.5) lib/abstract_controller/base.rb:136:in `process'
actionview (6.0.3.5) lib/action_view/rendering.rb:39:in `process'
rack-mini-profiler (2.3.1) lib/mini_profiler/profiling_methods.rb:111:in `block in profile_method'
actionpack (6.0.3.5) lib/action_controller/metal.rb:190:in `dispatch'
actionpack (6.0.3.5) lib/action_controller/metal.rb:254:in `dispatch'
actionpack (6.0.3.5) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
actionpack (6.0.3.5) lib/action_dispatch/routing/route_set.rb:33:in `serve'
actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:49:in `block in serve'
actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:32:in `each'
actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:32:in `serve'
actionpack (6.0.3.5) lib/action_dispatch/routing/route_set.rb:834:in `call'
lib/middleware/omniauth_bypass_middleware.rb:68:in `call'
rack (2.2.3) lib/rack/tempfile_reaper.rb:15:in `call'
rack (2.2.3) lib/rack/conditional_get.rb:27:in `call'
rack (2.2.3) lib/rack/head.rb:12:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:355:in `call'
rack (2.2.3) lib/rack/session/abstract/id.rb:266:in `context'
rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/cookies.rb:648:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
activesupport (6.0.3.5) lib/active_support/callbacks.rb:101:in `run_callbacks'
actionpack (6.0.3.5) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
logster (2.9.6) lib/logster/middleware/reporter.rb:43:in `call'
railties (6.0.3.5) lib/rails/rack/logger.rb:37:in `call_app'
railties (6.0.3.5) lib/rails/rack/logger.rb:28:in `call'
config/initializers/100-quiet_logger.rb:23:in `call'
config/initializers/100-silence_logger.rb:31:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/request_id.rb:27:in `call'
lib/middleware/enforce_hostname.rb:23:in `call'
rack (2.2.3) lib/rack/method_override.rb:24:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/executor.rb:14:in `call'
rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
actionpack (6.0.3.5) lib/action_dispatch/middleware/host_authorization.rb:76:in `call'
rack-mini-profiler (2.3.1) lib/mini_profiler/profiler.rb:373:in `call'
message_bus (3.3.4) lib/message_bus/rack/middleware.rb:61:in `call'
lib/middleware/request_tracker.rb:177:in `call'
railties (6.0.3.5) lib/rails/engine.rb:527:in `call'
railties (6.0.3.5) lib/rails/railtie.rb:190:in `public_send'
railties (6.0.3.5) lib/rails/railtie.rb:190:in `method_missing'
rack (2.2.3) lib/rack/urlmap.rb:74:in `block in call'
rack (2.2.3) lib/rack/urlmap.rb:58:in `each'
rack (2.2.3) lib/rack/urlmap.rb:58:in `call'
unicorn (6.0.0) lib/unicorn/http_server.rb:634:in `process_client'
unicorn (6.0.0) lib/unicorn/http_server.rb:732:in `worker_loop'
unicorn (6.0.0) lib/unicorn/http_server.rb:547:in `spawn_missing_workers'
unicorn (6.0.0) lib/unicorn/http_server.rb:143:in `start'
unicorn (6.0.0) bin/unicorn:128:in `<top (required)>'
vendor/bundle/ruby/2.7.0/bin/unicorn:23:in `load'
vendor/bundle/ruby/2.7.0/bin/unicorn:23:in `<main>'
在顶级且名称为单个单词的类别中功能正常，但在名称中包含连字符的子类别中则无法工作：/
以下可以正常工作：
https://forum.com/new-topic?category=admin&tags=tag1,tag2
https://forum.com/new-topic?category=moderators&tags=tag1,tag2
以下无法正常工作：（它们是子类别）
https://forum.com/new-topic?category=frontend-chat&tags=tag1,tag2
https://forum.com/new-topic?category=frontend-news&tags=tag1,tag2
（或许可以尝试传递类别 ID？这可行吗？）
编辑：
看来问题出在子类别上。我创建了一个名为“test”的新子类别，测试后仍然无法工作。随后我将该类别移出父类别，使其成为顶级类别……之后功能就正常了。
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因此，问题是该 URL 对子分类和标签单独使用时有效，但对同时包含多个标签的子分类无效。已更新标题。
通过 Ember 路由时运行正常，但在服务器端（例如在新标签页中打开）会失败。
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这里的情况和你帖子中的那个链接是一样的：
哎呀
驱动本讨论论坛的软件遇到了意外问题。我们为此给您带来的不便深表歉意。
有关错误的详细信息已被记录，并生成了自动通知。我们将对此进行检查。
无需采取进一步操作。不过，如果错误情况持续存在，您可以通过在网站的反馈类别中发布讨论主题来提供更多细节，包括复现错误的步骤。
……但在我的论坛中，这似乎发生在该类别是子类别而非顶级类别时。顺便提一下，我之前只是使用了类别名称，没有在 URL 中包含父类别名称（就像你那样），之前一切正常。
（我也不确定这是否应该被称为“复杂”URL——它不过是一个带有参数的新主题 URL 吧？）
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