预览摘要邮件错误：NoMethodError（nil:NilClass 未定义方法 `>=`）

zcuric · 2020 年4 月 17 日 12:39

你好，我在新版 Discourse 中预览摘要邮件时遇到以下错误：

NoMethodError (undefined method `>=' for nil:NilClass) /var/www/discourse/app/mailers/user_notifications.rb:227:in `digest'

堆栈跟踪

/var/www/discourse/app/mailers/user_notifications.rb:227:in `digest'
actionpack-6.0.1/lib/abstract_controller/base.rb:196:in `process_action'
actionpack-6.0.1/lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport-6.0.1/lib/active_support/callbacks.rb:101:in `run_callbacks'
actionpack-6.0.1/lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack-6.0.1/lib/abstract_controller/base.rb:136:in `process'
actionmailer-6.0.1/lib/action_mailer/rescuable.rb:25:in `block in process'
actionmailer-6.0.1/lib/action_mailer/rescuable.rb:17:in `handle_exceptions'
actionmailer-6.0.1/lib/action_mailer/rescuable.rb:24:in `process'
actionview-6.0.1/lib/action_view/rendering.rb:39:in `process'
actionmailer-6.0.1/lib/action_mailer/base.rb:637:in `block in process'
activesupport-6.0.1/lib/active_support/notifications.rb:180:in `block in instrument'
activesupport-6.0.1/lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport-6.0.1/lib/active_support/notifications.rb:180:in `instrument'
actionmailer-6.0.1/lib/action_mailer/base.rb:636:in `process'
actionmailer-6.0.1/lib/action_mailer/message_delivery.rb:123:in `block in processed_mailer'
actionmailer-6.0.1/lib/action_mailer/message_delivery.rb:122:in `tap'
actionmailer-6.0.1/lib/action_mailer/message_delivery.rb:122:in `processed_mailer'
actionmailer-6.0.1/lib/action_mailer/message_delivery.rb:29:in `__getobj__'
/usr/local/lib/ruby/2.6.0/delegate.rb:80:in `method_missing'
/var/www/discourse/lib/email/renderer.rb:18:in `html'
/var/www/discourse/app/controllers/admin/email_controller.rb:93:in `preview_digest'
actionpack-6.0.1/lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack-6.0.1/lib/abstract_controller/base.rb:196:in `process_action'
actionpack-6.0.1/lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack-6.0.1/lib/abstract_controller/callbacks.rb:42:in `block in process_action'
activesupport-6.0.1/lib/active_support/callbacks.rb:135:in `run_callbacks'
actionpack-6.0.1/lib/abstract_controller/callbacks.rb:41:in `process_action'
actionpack-6.0.1/lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack-6.0.1/lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'
activesupport-6.0.1/lib/active_support/notifications.rb:180:in `block in instrument'
activesupport-6.0.1/lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport-6.0.1/lib/active_support/notifications.rb:180:in `instrument'
actionpack-6.0.1/lib/action_controller/metal/instrumentation.rb:32:in `process_action'
actionpack-6.0.1/lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
activerecord-6.0.1/lib/active_record/railties/controller_runtime.rb:27:in `process_action'
actionpack-6.0.1/lib/abstract_controller/base.rb:136:in `process'
actionview-6.0.1/lib/action_view/rendering.rb:39:in `process'
rack-mini-profiler-2.0.1/lib/mini_profiler/profiling_methods.rb:78:in `block in profile_method'
actionpack-6.0.1/lib/action_controller/metal.rb:191:in `dispatch'
actionpack-6.0.1/lib/action_controller/metal.rb:252:in `dispatch'
actionpack-6.0.1/lib/action_dispatch/routing/route_set.rb:51:in `dispatch'
actionpack-6.0.1/lib/action_dispatch/routing/route_set.rb:33:in `serve'
actionpack-6.0.1/lib/action_dispatch/routing/mapper.rb:18:in `block in <class:Constraints>'
actionpack-6.0.1/lib/action_dispatch/routing/mapper.rb:48:in `serve'
actionpack-6.0.1/lib/action_dispatch/journey/router.rb:49:in `block in serve'
actionpack-6.0.1/lib/action_dispatch/journey/router.rb:32:in `each'
actionpack-6.0.1/lib/action_dispatch/journey/router.rb:32:in `serve'
actionpack-6.0.1/lib/action_dispatch/routing/route_set.rb:837:in `call'
/var/www/discourse/lib/middleware/omniauth_bypass_middleware.rb:68:in `call'
rack-2.0.8/lib/rack/tempfile_reaper.rb:15:in `call'
rack-2.0.8/lib/rack/conditional_get.rb:25:in `call'
rack-2.0.8/lib/rack/head.rb:12:in `call'
/var/www/discourse/lib/content_security_policy/middleware.rb:12:in `call'
/var/www/discourse/lib/middleware/anonymous_cache.rb:318:in `call'
rack-2.0.8/lib/rack/session/abstract/id.rb:259:in `context'
rack-2.0.8/lib/rack/session/abstract/id.rb:253:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/cookies.rb:648:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
activesupport-6.0.1/lib/active_support/callbacks.rb:101:in `run_callbacks'
actionpack-6.0.1/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/actionable_exceptions.rb:17:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
logster-2.8.0/lib/logster/middleware/reporter.rb:43:in `call'
railties-6.0.1/lib/rails/rack/logger.rb:38:in `call_app'
railties-6.0.1/lib/rails/rack/logger.rb:28:in `call'
/var/www/discourse/config/initializers/100-quiet_logger.rb:18:in `call'
/var/www/discourse/config/initializers/100-silence_logger.rb:31:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/request_id.rb:27:in `call'
/var/www/discourse/lib/middleware/enforce_hostname.rb:22:in `call'
rack-2.0.8/lib/rack/method_override.rb:22:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/executor.rb:14:in `call'
rack-2.0.8/lib/rack/sendfile.rb:111:in `call'
actionpack-6.0.1/lib/action_dispatch/middleware/host_authorization.rb:77:in `call'
rack-mini-profiler-2.0.1/lib/mini_profiler/profiler.rb:200:in `call'
message_bus-2.2.4/lib/message_bus/rack/middleware.rb:57:in `call'
/var/www/discourse/lib/middleware/request_tracker.rb:172:in `call'
railties-6.0.1/lib/rails/engine.rb:526:in `call'
railties-6.0.1/lib/rails/railtie.rb:190:in `public_send'
railties-6.0.1/lib/rails/railtie.rb:190:in `method_missing'
rack-2.0.8/lib/rack/urlmap.rb:68:in `block in call'
rack-2.0.8/lib/rack/urlmap.rb:53:in `each'
rack-2.0.8/lib/rack/urlmap.rb:53:in `call'
unicorn-5.5.4/lib/unicorn/http_server.rb:605:in `process_client'
unicorn-5.5.4/lib/unicorn/http_server.rb:700:in `worker_loop'
unicorn-5.5.4/lib/unicorn/http_server.rb:548:in `spawn_missing_workers'
unicorn-5.5.4/lib/unicorn/http_server.rb:144:in `start'
unicorn-5.5.4/bin/unicorn:128:in `<top (required)>'
/var/www/discourse/vendor/bundle/ruby/2.6.0/bin/unicorn:23:in `load'
/var/www/discourse/vendor/bundle/ruby/2.6.0/bin/unicorn:23:in `<main>'

如果用户设置了时间段，此问题可以解决：

偏好设置 > 邮件 > 活动摘要

codinghorror · 2020 年4 月 19 日 17:33

我们能否复现这个问题 @tshenry？

tshenry · 2020 年5 月 1 日 23:14

我尝试在我们的托管基础设施上通过新实例以及全新的 DO Droplet 触发此问题，但未能复现。

@zcuric，能否提供更多具体信息？如果能提供一个可稳定复现该错误的方法，那就太好了。

zcuric · 2020 年5 月 5 日 15:10

@tshenry
据我所知，步骤如下：

创建新实例
从开发实例导入设置（如下所示，其中移除了部分个人设置）到新实例

suggested_topics: '0'
post_menu: read|share|edit|bookmark|delete|flag|admin|reply
desktop_category_page_style: categories_only
fixed_category_positions: 'true'
fixed_category_positions_on_create: 'true'
enable_badges: 'false'
push_notifications_prompt: 'false'
login_required: 'true'
email_editable: 'false'
public_user_custom_fields: is_learning
enable_user_directory: 'false'
hide_user_profiles_from_public: 'true'
max_notifications_per_user: '10'
enable_group_directory: 'false'
title_prettify: 'false'
allow_uncategorized_topics: 'false'
enable_personal_messages: 'false'
enable_system_message_replies: 'false'
edit_history_visible_to_public: 'false'
max_reply_history: '4'
newuser_max_mentions_per_post: '10'
emoji_set: google
email_time_window_mins: '30'
email_accent_bg_color: F1F3F4
email_accent_fg_color: "#343F79"
email_link_color: "#343F79"
reply_by_email_enabled: 'true'
manual_polling_enabled: 'true'
pop3_polling_ssl: 'false'
pop3_polling_openssl_verify: 'false'
log_mail_processing_failures: 'true'
email_in: 'true'
email_in_min_trust: '0'
unsubscribe_via_email_footer: 'true'
theme_authorized_extensions: jpg|jpeg|png|woff|woff2|svg|eot|ttf|otf|gif|js|*
authorized_extensions: jpg|jpeg|png|gif|*
allow_uploaded_avatars: 'false'
restrict_letter_avatar_colors: 343F79
default_trust_level: '1'
allow_flagging_staff: 'false'
send_tl1_welcome_message: 'false'
trusted_users_can_edit_others: 'false'
detailed_404: 'true'
enable_flash_video_onebox: 'true'
auto_silence_fast_typers_on_first_post: 'false'
max_edits_per_day: '100'
max_topics_in_first_day: '10'
privacy_policy_url: "/t/about/6"
search_prefer_recent_posts: 'true'
new_version_emails: 'false'
educate_until_posts: '1'
disable_avatar_education_message: 'true'
show_create_topics_notice: 'false'
likes_notification_consolidation_window_mins: '1'
automatically_unpin_topics: 'false'
default_email_digest_frequency: '0'
default_email_mailing_list_mode: 'true'
default_other_like_notification_frequency: '3'
dashboard_general_tab_activity_metrics: page_view_total_reqs|visits|time_to_first_response|user_to_user_private_messages_with_replies
discourse_narrative_bot_enabled: 'false'
disable_discourse_narrative_bot_welcome_post: 'true'
discourse_narrative_bot_welcome_post_delay: '1'
allow_solved_on_all_topics: 'true

出现了此错误。

tshenry · 2020 年5 月 16 日 00:46

好吧，这确实有点棘手！我最终在一个全新、自行安装的环境中通过导入站点设置成功复现了问题（这似乎是关键所在）。目前我认为已经将其定位到某个特定设置。以下是导致该问题的完整复现步骤：

按照我们的安装指南操作，直到管理员创建步骤（先不要创建管理员）。进入应用：
```
./launcher enter app
```
在 /var/www/discourse 目录下创建一个 settings.yml 文件，内容如下：
```
---
default_email_digest_frequency: '0'
```
运行
```
rake site_settings:import < settings.yml
```
你应该会看到类似 Changed default_email_digest_frequency FROM: 10080 TO: 0 的提示。
通过 UI 创建管理员，跳过设置向导，直接进入站点设置中的摘要预览。
你会看到以下内容，并在 /logs 中看到相关条目：

Screen Shot 2020-05-15 at 4.09.47 PM722×534 25 KB

以下是我从 Rails 控制台手动修复该情况的方法：

# 获取第一个也是唯一一个普通用户的用户选项
user_op = User.find(1).user_option

# 注意它被设置为 nil
user_op.digest_after_minutes
=> nil

# 将其设置为一个有效值。我选择了 0
user_op.digest_after_minutes = 0
user_op.save!

之后，摘要预览就能正常工作了。

我暂时还不确定修复方案是什么。以下代码让我有些怀疑，因为其中有一个大于 0 的测试，而我们的导入值是 0：

github.com/discourse/discourse

lib/tasks/import.rake

869f9b20a


      
          , #{SiteSetting.default_email_digest_frequency.to_i > 0}

@codinghorror 你认为这是一个如此边缘的情况，以至于我们应该等待“三次法则”（rule of 3）出现更多类似案例吗？还是你希望我或其他人进一步调查并修复这个问题？

codinghorror · 2020 年5 月 16 日 01:12

可能是个简单的修复？也许 @sam 可以安排在周一？

话题		回复	浏览量
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Digest/Activity Summary emails not sending for users even though all conditions are met (Discourse 3.6) Support activity-summary , email	19	274	2025 年12 月 3 日
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Please restore email digests Feature	47	7156	2017 年6 月 20 日

预览摘要邮件错误：NoMethodError（nil:NilClass 未定义方法 `>=`）

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