发布页面时出现 500 错误

[thethirdpudding]

你好，

我想在我的实例上尝试新的页面发布功能，但在标签页中打开链接时遇到了 500 错误。无论是公开主题还是私密主题都出现了这个问题。

我刚刚尝试重新构建到最新的可用提交 629ee5494d ，但问题仍然存在。

日志如下：

ActionView::Template::Error (undefined method `url' for nil:NilClass) app/views/published_pages/show.html.erb:6 app/controllers/published_pages_controller.rb:49:in `show' app/controllers/application_c 


app/views/published_pages/show.html.erb:6
actionview (6.0.3.2) lib/action_view/base.rb:274:in `_run'
actionview (6.0.3.2) lib/action_view/template.rb:185:in `block in render'
activesupport (6.0.3.2) lib/active_support/notifications.rb:182:in `instrument'
actionview (6.0.3.2) lib/action_view/template.rb:385:in `instrument_render_template'
actionview (6.0.3.2) lib/action_view/template.rb:183:in `render'
rack-mini-profiler (2.0.4) lib/mini_profiler/profiling_methods.rb:104:in `block in profile_method'


actionview (6.0.3.2) lib/action_view/renderer/template_renderer.rb:58:in `block (2 levels) in render_template'
actionview (6.0.3.2) lib/action_view/renderer/abstract_renderer.rb:88:in `block in instrument'
activesupport (6.0.3.2) lib/active_support/notifications.rb:180:in `block in instrument'
activesupport (6.0.3.2) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport (6.0.3.2) lib/active_support/notifications.rb:180:in `instrument'
actionview (6.0.3.2) lib/action_view/renderer/abstract_renderer.rb:87:in `instrument'
actionview (6.0.3.2) lib/action_view/renderer/template_renderer.rb:57:in `block in render_template'
actionview (6.0.3.2) lib/action_view/renderer/template_renderer.rb:65:in `render_with_layout'
actionview (6.0.3.2) lib/action_view/renderer/template_renderer.rb:56:in `render_template'
actionview (6.0.3.2) lib/action_view/renderer/template_renderer.rb:13:in `render'
actionview (6.0.3.2) lib/action_view/renderer/renderer.rb:61:in `render_template_to_object'
actionview (6.0.3.2) lib/action_view/renderer/renderer.rb:29:in `render_to_object'
actionview (6.0.3.2) lib/action_view/rendering.rb:117:in `block in _render_template'
actionview (6.0.3.2) lib/action_view/base.rb:304:in `in_rendering_context'
actionview (6.0.3.2) lib/action_view/rendering.rb:116:in `_render_template'
actionpack (6.0.3.2) lib/action_controller/metal/streaming.rb:218:in `_render_template'
actionview (6.0.3.2) lib/action_view/rendering.rb:103:in `render_to_body'
actionpack (6.0.3.2) lib/action_controller/metal/rendering.rb:52:in `render_to_body'
actionpack (6.0.3.2) lib/action_controller/metal/renderers.rb:142:in `render_to_body'
actionpack (6.0.3.2) lib/abstract_controller/rendering.rb:25:in `render'
actionpack (6.0.3.2) lib/action_controller/metal/rendering.rb:36:in `render'
actionpack (6.0.3.2) lib/action_controller/metal/instrumentation.rb:44:in `block (2 levels) in render'
activesupport (6.0.3.2) lib/active_support/core_ext/benchmark.rb:14:in `block in ms'
/usr/local/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
activesupport (6.0.3.2) lib/active_support/core_ext/benchmark.rb:14:in `ms'
actionpack (6.0.3.2) lib/action_controller/metal/instrumentation.rb:44:in `block in render'
actionpack (6.0.3.2) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
activerecord (6.0.3.2) lib/active_record/railties/controller_runtime.rb:34:in `cleanup_view_runtime'
actionpack (6.0.3.2) lib/action_controller/metal/instrumentation.rb:43:in `render'
app/controllers/published_pages_controller.rb:49:in `show'
actionpack (6.0.3.2) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (6.0.3.2) lib/abstract_controller/base.rb:195:in `process_action'
actionpack (6.0.3.2) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (6.0.3.2) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport (6.0.3.2) lib/active_support/callbacks.rb:112:in `block in run_callbacks'
app/controllers/application_controller.rb:340:in `block in with_resolved_locale'
i18n (1.8.5) lib/i18n.rb:313:in `with_locale'
app/controllers/application_controller.rb:340:in `with_resolved_locale'
activesupport (6.0.3.2) lib/active_support/callbacks.rb:121:in `block in run_callbacks'
activesupport (6.0.3.2) lib/active_support/callbacks.rb:139:in `run_callbacks'
actionpack (6.0.3.2) lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack (6.0.3.2) lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack (6.0.3.2) lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'
activesupport (6.0.3.2) lib/active_support/notifications.rb:180:in `block in instrument'
activesupport (6.0.3.2) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport (6.0.3.2) lib/active_support/notifications.rb:180:in `instrument'
actionpack (6.0.3.2) lib/action_controller/metal/instrumentation.rb:32:in `process_action'
actionpack (6.0.3.2) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
activerecord (6.0.3.2) lib/active_record/railties/controller_runtime.rb:27:in `process_action'
actionpack (6.0.3.2) lib/abstract_controller/base.rb:136:in `process'
actionview (6.0.3.2) lib/action_view/rendering.rb:39:in `process'
rack-mini-profiler (2.0.4) lib/mini_profiler/profiling_methods.rb:104:in `block in profile_method'


actionpack (6.0.3.2) lib/action_controller/metal.rb:190:in `dispatch'
actionpack (6.0.3.2) lib/action_controller/metal.rb:254:in `dispatch'
actionpack (6.0.3.2) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
actionpack (6.0.3.2) lib/action_dispatch/routing/route_set.rb:33:in `serve'
actionpack (6.0.3.2) lib/action_dispatch/journey/router.rb:49:in `block in serve'
actionpack (6.0.3.2) lib/action_dispatch/journey/router.rb:32:in `each'
actionpack (6.0.3.2) lib/action_dispatch/journey/router.rb:32:in `serve'
actionpack (6.0.3.2) 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:336: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 (6.0.3.2) lib/action_dispatch/middleware/cookies.rb:648:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
activesupport (6.0.3.2) lib/active_support/callbacks.rb:101:in `run_callbacks'
actionpack (6.0.3.2) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/actionable_exceptions.rb:17:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
logster (2.9.3) lib/logster/middleware/reporter.rb:43:in `call'
railties (6.0.3.2) lib/rails/rack/logger.rb:37:in `call_app'
railties (6.0.3.2) lib/rails/rack/logger.rb:28:in `call'
config/initializers/100-quiet_logger.rb:19:in `call'
config/initializers/100-silence_logger.rb:31:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/request_id.rb:27:in `call'
lib/middleware/enforce_hostname.rb:22:in `call'
rack (2.2.3) lib/rack/method_override.rb:24:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/executor.rb:14:in `call'
rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
actionpack (6.0.3.2) lib/action_dispatch/middleware/host_authorization.rb:76:in `call'
rack-mini-profiler (2.0.4) lib/mini_profiler/profiler.rb:321:in `call'


message_bus (3.3.1) lib/message_bus/rack/middleware.rb:61:in `call'
lib/middleware/request_tracker.rb:176:in `call'
railties (6.0.3.2) lib/rails/engine.rb:527:in `call'
railties (6.0.3.2) lib/rails/railtie.rb:190:in `public_send'
railties (6.0.3.2) 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 (5.6.0) lib/unicorn/http_server.rb:632:in `process_client'
unicorn (5.6.0) lib/unicorn/http_server.rb:728:in `worker_loop'
unicorn (5.6.0) lib/unicorn/http_server.rb:548:in `spawn_missing_workers'
unicorn (5.6.0) lib/unicorn/http_server.rb:144:in `start'
unicorn (5.6.0) bin/unicorn:128:in `<top (required)>'
vendor/bundle/ruby/2.6.0/bin/unicorn:23:in `load'
vendor/bundle/ruby/2.6.0/bin/unicorn:23:in `<main>'

任何帮助都将不胜感激，谢谢！

[simon]

您报告的错误来自 https://github.com/discourse/discourse/blob/master/app/views/published_pages/show.html.erb#L6。系统正在尝试查找由您站点的 logo_small 设置所指定的徽标 URL。

我可以通过删除由我的站点的 logo_small 设置所指定的徽标来复现该错误。

如果您尚未为站点设置小徽标，设置一个即可消除此错误。不过，我认为这需要在 Discourse 代码中进行修复。未设置小徽标不应在访问已发布页面时导致致命错误。

[vinothkannans (Vinoth Kannan)]

此问题现已修复，见下方 现在如果小徽标不可用，将使用桌面徽标。

FIX: use normal logo in published pages if small not available.

我认为如果两个徽标都不可用，应该使用站点标题。但在当前的用户界面中，由于旁边已有页面标题，这样看起来不太美观。或许我们应该像下面的示例那样，将页面标题从站点标题栏中移开？