@darkpixlz 您能否确认您正在运行哪个版本的 Discourse？是 stable、beta 还是 tests-passed？
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我刚刚将此提交推送到核心：
它引入了一个新的 rake 任务，应该能帮助我们追踪此问题。我们在自己的托管上根本没有看到任何错误，因此这表明它与第三方插件有关。
请有人遇到此问题的人更新到最新的 tests-passed，然后运行：
./launcher enter app
cd /var/www/discourse
bin/rake "revisions:debug_deserialization"
这应该会打印出有关有问题类的信息，以及每个类的示例修订。请在此主题中分享输出的摘要/示例部分（如果您不想公开分享示例修订，也可以通过私信分享）。
一旦我们确切知道是什么原因导致了问题，这将有助于我们构建一个修复程序。（很可能是第三方插件中的数据库迁移，或者是可以清理任何意外数据的核心 rake 任务）
6 个赞
我已要求我的主机运行它，一旦我得到结果，我将在此处更新。
2 个赞
我们正在等待人员从 rake 任务中汇报信息，然后再继续。
请告知。
2 个赞
是的，他从未回复我，我只是提醒了他。
大家好，
很遗憾在这个帖子里浪费了时间……
所以我刚更新到最新的构建版本，但仍然存在这个问题。
我尝试运行这个，但猜我的设置不允许我在这里提供帮助：
我把它运行在 docker / postgres 里面。
还有什么我可以帮助你的吗？
这些是我使用的插件
您需要设置环境… 尝试使用 rake 而不是 bin/rake
Ah, if you did ./launcher enter app, it’ll make you root. It seems like you’ll need to switch to the discourse user to get Database access. This should do it:
sudo -EH -u discourse bin/rake "revisions:debug_deserialization"
The kind of output we’re looking for is
Checking 5 PostRevision records in batches of 1000... this may take some time...
Done
---- Summary ----
Checked records: 5
---- Examples ----
(although obviously, if there are issues then the “Examples” section will not be empty)
2 个赞
这是我们的输出；
sudo -EH -u discourse bin/rake "revisions:debug_deserialization"
正在分批（每批 1000 条）检查 1096 条 PostRevision 记录……这可能需要一些时间……
完成
---- 摘要 ----
已检查记录：1096
---- 示例 ----
1 个赞
哦！这真是出乎意料！
您在尝试查看某些帖子修订时是否仍然遇到错误？
顺便问一下，这是“标准安装”，还是托管在多站点集群中？
是的，这是标准的。
而且现在也不是了，我没注意到有什么问题，我认为这可能已经解决了。
1 个赞
好的，太棒了，谢谢 @darkpixlz
2 个赞
非常感谢各位！
这次运行成功了，这是输出结果
$w3dg @ 06:14:52 > /var/discourse: sudo ./launcher enter app
[sudo] w3dg 的密码:
WARNING: Docker version 17.05.0-ce 已弃用，建议升级到 17.06.2 或更新版本。
检测到 x86_64 架构。
WARNING: containers/app.yml 文件是可被所有人读取的。您可以通过运行以下命令来保护此文件：chmod o-rwx containers/app.yml
root@W3DG-app:/var/www/discourse# cd /var/www/discourse
root@W3DG-app:/var/www/discourse# sudo -EH -u discourse bin/rake "revisions:debug_deserialization"
正在分批（每批 1000 条）检查 18451 条 PostRevision 记录……这可能需要一些时间……
完成
---- 摘要 ----
已检查记录：18451
---- 示例 ----
root@W3DG-app:/var/www/discourse#
但不幸的是，我在那个 这里的主题 中的修订仍然是空的。抱歉。我还能提供其他日志吗？
顺便说一句，我的 discourse 也是标准安装的。
2 个赞
感谢 @B-iggy。这很令人惊讶——我本以为脚本会列出错误。
请尝试访问您网站上的 /logs，看看是否有任何最近的错误日志？特别是，我们正在寻找以 Psych::DisallowedClass 开头的日志。
2 个赞
Sure. I have bunch of Psych errors.
Question is: which one you need? 
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:97:in `find'
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:28:in `load'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:411:in `resolve_class'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:208:in `visit_Psych_Nodes_Mapping'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:16:in `visit'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:6:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:32:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `block in register_empty'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `each'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `register_empty'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:141:in `visit_Psych_Nodes_Sequence'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:16:in `visit'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:6:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:32:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `block in register_empty'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `each'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `register_empty'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:141:in `visit_Psych_Nodes_Sequence'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:16:in `visit'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:6:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:32:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:340:in `block in revive_hash'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:338:in `each'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:338:in `each_slice'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:338:in `revive_hash'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:162:in `visit_Psych_Nodes_Mapping'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:16:in `visit'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:6:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:32:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:313:in `visit_Psych_Nodes_Document'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:16:in `visit'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:6:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:32:in `accept'
/usr/local/lib/ruby/2.7.0/psych.rb:360:in `safe_load'
activerecord (7.0.3.1) lib/active_record/coders/yaml_column.rb:50:in `yaml_load'
activerecord (7.0.3.1) lib/active_record/coders/yaml_column.rb:26:in `load'
activerecord (7.0.3.1) lib/active_record/type/serialized.rb:22:in `deserialize'
activemodel (7.0.3.1) lib/active_model/type/helpers/mutable.rb:8:in `cast'
activemodel (7.0.3.1) lib/active_model/attribute.rb:179:in `type_cast'
activemodel (7.0.3.1) lib/active_model/attribute.rb:43:in `value'
activemodel (7.0.3.1) lib/active_model/attribute_set.rb:46:in `fetch_value'
activerecord (7.0.3.1) lib/active_record/attribute_methods/read.rb:38:in `_read_attribute'
activemodel (7.0.3.1) lib/active_model/attribute_methods.rb:277:in `modifications'
app/serializers/post_revision_serializer.rb:233:in `block in all_revisions'
app/serializers/post_revision_serializer.rb:228:in `each'
app/serializers/post_revision_serializer.rb:228:in `all_revisions'
app/serializers/post_revision_serializer.rb:187:in `revisions'
app/serializers/post_revision_serializer.rb:254:in `previous'
app/serializers/post_revision_serializer.rb:50:in `previous_hidden'
(eval):5:in `_fast_attributes'
active_model_serializers (0.8.4) lib/active_model/serializer.rb:456:in `attributes'
active_model_serializers (0.8.4) lib/active_model/serializer.rb:480:in `_serializable_hash'
active_model_serializers (0.8.4) lib/active_model/serializer.rb:359:in `serializable_hash'
active_model_serializers (0.8.4) lib/active_model/serializer.rb:347:in `as_json'
activesupport (7.0.3.1) lib/active_support/json/encoding.rb:22:in `encode'
activesupport (7.0.3.1) lib/active_support/json/encoding.rb:22:in `encode'
activesupport (7.0.3.1) lib/active_support/core_ext/object/json.rb:42:in `to_json'
active_model_serializers (0.8.4) lib/active_model/serializer.rb:331:in `to_json'
multi_json (1.15.0) lib/multi_json/adapters/oj.rb:56:in `dump'
multi_json (1.15.0) lib/multi_json/adapters/oj.rb:56:in `dump'
multi_json (1.15.0) lib/multi_json/adapter.rb:25:in `dump'
multi_json (1.15.0) lib/multi_json.rb:139:in `dump'
app/controllers/application_controller.rb:547:in `render_json_dump'
app/controllers/posts_controller.rb:428:in `latest_revision'
actionpack (7.0.3.1) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
actionpack (7.0.3.1) lib/abstract_controller/base.rb:215:in `process_action'
actionpack (7.0.3.1) lib/action_controller/metal/rendering.rb:53:in `process_action'
actionpack (7.0.3.1) lib/abstract_controller/callbacks.rb:234:in `block in process_action'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:118:in `block in run_callbacks'
app/controllers/application_controller.rb:415:in `block in with_resolved_locale'
i18n (1.12.0) lib/i18n.rb:322:in `with_locale'
app/controllers/application_controller.rb:415:in `with_resolved_locale'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:127:in `block in run_callbacks'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:138:in `run_callbacks'
actionpack (7.0.3.1) lib/abstract_controller/callbacks.rb:233:in `process_action'
actionpack (7.0.3.1) lib/action_controller/metal/rescue.rb:22:in `process_action'
actionpack (7.0.3.1) lib/action_controller/metal/instrumentation.rb:67:in `block in process_action'
activesupport (7.0.3.1) lib/active_support/notifications.rb:206:in `block in instrument'
activesupport (7.0.3.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
activesupport (7.0.3.1) lib/active_support/notifications.rb:206:in `instrument'
actionpack (7.0.3.1) lib/action_controller/metal/instrumentation.rb:66:in `process_action'
actionpack (7.0.3.1) lib/action_controller/metal/params_wrapper.rb:259:in `process_action'
activerecord (7.0.3.1) lib/active_record/railties/controller_runtime.rb:27:in `process_action'
actionpack (7.0.3.1) lib/abstract_controller/base.rb:151:in `process'
actionview (7.0.3.1) lib/action_view/rendering.rb:39:in `process'
rack-mini-profiler (3.0.0) lib/mini_profiler/profiling_methods.rb:85:in `block in profile_method'
actionpack (7.0.3.1) lib/action_controller/metal.rb:188:in `dispatch'
actionpack (7.0.3.1) lib/action_controller/metal.rb:251:in `dispatch'
actionpack (7.0.3.1) lib/action_dispatch/routing/route_set.rb:49:in `dispatch'
actionpack (7.0.3.1) lib/action_dispatch/routing/route_set.rb:32:in `serve'
actionpack (7.0.3.1) lib/action_dispatch/journey/router.rb:50:in `block in serve'
actionpack (7.0.3.1) lib/action_dispatch/journey/router.rb:32:in `each'
actionpack (7.0.3.1) lib/action_dispatch/journey/router.rb:32:in `serve'
actionpack (7.0.3.1) lib/action_dispatch/routing/route_set.rb:852:in `call'
lib/middleware/omniauth_bypass_middleware.rb:71:in `call'
rack (2.2.4) lib/rack/tempfile_reaper.rb:15:in `call'
rack (2.2.4) lib/rack/conditional_get.rb:27:in `call'
rack (2.2.4) lib/rack/head.rb:12:in `call'
actionpack (7.0.3.1) lib/action_dispatch/http/permissions_policy.rb:38:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:366:in `call'
config/initializers/008-rack-cors.rb:25:in `call'
rack (2.2.4) lib/rack/session/abstract/id.rb:266:in `context'
rack (2.2.4) lib/rack/session/abstract/id.rb:260:in `call'
actionpack (7.0.3.1) lib/action_dispatch/middleware/cookies.rb:697:in `call'
actionpack (7.0.3.1) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
activesupport (7.0.3.1) lib/active_support/callbacks.rb:99:in `run_callbacks'
actionpack (7.0.3.1) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
actionpack (7.0.3.1) lib/action_dispatch/middleware/debug_exceptions.rb:28:in `call'
actionpack (7.0.3.1) lib/action_dispatch/middleware/show_exceptions.rb:26:in `call'
logster (2.11.3) lib/logster/middleware/reporter.rb:43:in `call'
railties (7.0.3.1) lib/rails/rack/logger.rb:40:in `call_app'
railties (7.0.3.1) lib/rails/rack/logger.rb:27:in `call'
config/initializers/100-quiet_logger.rb:23:in `call'
config/initializers/100-silence_logger.rb:31:in `call'
actionpack (7.0.3.1) lib/action_dispatch/middleware/remote_ip.rb:93:in `call'
actionpack (7.0.3.1) lib/action_dispatch/middleware/reque
Message (33 copies reported)
Psych::DisallowedClass (Tried to load unspecified class: Tag)
app/serializers/post_revision_serializer.rb:233:in `block in all_revisions'
app/serializers/post_revision_serializer.rb:228:in `each'
app/serializers/post_revision_serializer.rb:228:in `all_revisions'
app/serializers/post_revision_serializer.rb:187:in `revisions'
app/serializers/post_revision_serializer.rb:254:in `previous'
app/serializers/post_revision_serializer.rb:50:in `previous_hidden'
(eval):5:in `_fast_attributes'
app/controllers/application_controller.rb:547:in `render_json_dump'
app/controllers/posts_controller.rb:428:in `latest_revision'
app/controllers/application_controller.rb:415:in `block in with_resolved_locale'
app/controllers/application_controller.rb:415:in `with_resolved_locale'
lib/middleware/omniauth_bypass_middleware.rb:71:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:366:in `call'
config/initializers/008-rack-cors.rb:25: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:202:in `call'
Backtrace
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:97:in `find'
/usr/local/lib/ruby/2.7.0/psych/class_loader.rb:28:in `load'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:411:in `resolve_class'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:208:in `visit_Psych_Nodes_Mapping'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:16:in `visit'
/usr/local/lib/ruby/2.7.0/psych/visitors/visitor.rb:6:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:32:in `accept'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `block in register_empty'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `each'
/usr/local/lib/ruby/2.7.0/psych/visitors/to_ruby.rb:332:in `register_empty'
Env
HTTP HOSTS: forum.empyrion-homeworld.net
Psych::DisallowedClass (Tried to load unspecified class: Tag)
app/serializers/post_revision_serializer.rb:233:in `block in all_revisions'
app/serializers/post_revision_serializer.rb:228:in `each'
app/serializers/post_revision_serializer.rb:228:in `all_revisions'
app/serializers/post_revision_serializer.rb:187:in `revisions'
app/serializers/post_revision_serializer.rb:254:in `previous'
app/serializers/post_revision_serializer.rb:50:in `previous_hidden'
(eval):5:in `_fast_attributes'
app/controllers/application_controller.rb:547:in `render_json_dump'
app/controllers/posts_controller.rb:428:in `latest_revision'
app/controllers/application_controller.rb:415:in `block in with_resolved_locale'
app/controllers/application_controller.rb:415:in `with_resolved_locale'
lib/middleware/omniauth_bypass_middleware.rb:71:in `call'
lib/content_security_policy/middleware.rb:12:in `call'
lib/middleware/anonymous_cache.rb:368:in `call'
config/initializers/008-rack-cors.rb:25: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:202:in `call'
1 个赞
谢谢，这很有帮助！请尝试运行此命令并粘贴输出？
sudo -EH -u discourse bin/rails runner "puts PostRevisor.tracked_topic_fields.inspect"
这将帮助我们识别哪些插件正在向 PostRevisions 添加数据 
在我的本地站点上，它返回
{:title=>#<Proc:0x0000000124b02960 /Users/david/discourse/discourse/lib/post_revisor.rb:79>, :archetype=>#<Proc:0x0000000124b028c0 /Users/david/discourse/discourse/lib/post_revisor.rb:83>, :category_id=>#<Proc:0x0000000124b020a0 /Users/david/discourse/discourse/lib/post_revisor.rb:87>, :tags=>#<Proc:0x0000000124b01880 /Users/david/discourse/discourse/lib/post_revisor.rb:103>, :featured_link=>#<Proc:0x0000000124b017e0 /Users/david/discourse/discourse/lib/post_revisor.rb:129>}
1 个赞
非常感谢！
这是我的输出
root@W3DG-app:/var/www/discourse# sudo -EH -u discourse bin/rails runner "puts PostRevisor.tracked_topic_fields.inspect"
{:title=>#<Proc:0x0000563008c879c0 /var/www/discourse/lib/post_revisor.rb:79>, :archetype=>#<Proc:0x0000563008c87920 /var/www/discourse/lib/post_revisor.rb:83>, :category_id=>#<Proc:0x0000563008c87010 /var/www/discourse/lib/post_revisor.rb:87>, :tags=>#<Proc:0x0000563008c867a0 /var/www/discourse/lib/post_revisor.rb:103>, :featured_link=>#<Proc:0x0000563008c86700 /var/www/discourse/lib/post_revisor.rb:129>}
1 个赞
@B-iggy 和我通过私信对此进行了一些挖掘，并设法找到了问题所在。所讨论的主题附加了一些旧标签，但网站上禁用了标签功能。这两件事结合在一起导致了核心中的一个奇怪的边缘情况，从而导致了错误。该特定问题应通过以下方式解决：
可能仍然存在其他问题，因此我将在此主题上保留几周。如果您仍然看到加载修订版本时出现问题，请告知。
6 个赞