Rails4 - 如何删除使用Mailboxer gem创建的所有邮件？

Question

我在rails应用程序中遵循了教程并添加了消息传递功能。
昨天，我删除了某些用户。 现在，当我转到我的消息链接时，我收到此错误消息“我们很抱歉，但出现了问题。如果您是应用程序所有者，请查看日志以获取更多信息。” 通常在出现错误时显示。

我看到了日志，发现我必须删除已发送邮件的人。
我认为它正在尝试检索不存在的用户的消息。

ActionView::Template::Error (undefined method `avatar' for nil:NilClass):

我该如何解决这个问题？
任何人都可以分享如何删除所有邮件并重新开始？ 因为消息并不重要。
如何清除所有邮箱表并重新开始？ 请帮助。

这是日志。

2015-05-16T12:17:13.398640+00:00 app[web.1]:   Rendered conversations/_participants.html.erb (17.3ms)
2015-05-16T12:17:13.407905+00:00 app[web.1]:   CACHE (0.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 2225]]
2015-05-16T12:17:13.434486+00:00 app[web.1]:    (16.2ms)  SELECT COUNT(*) FROM "mailboxer_receipts" INNER JOIN "mailboxer_notifications" ON "mailboxer_notifications"."id" = "mailboxer_receipts"."notification_id" AND "mailboxer_notifications"."type" IN ('Mailboxer::Message') WHERE "mailboxer_notifications"."conversation_id" = 973 AND "mailboxer_receipts"."receiver_id" = $1 AND "mailboxer_receipts"."receiver_type" = $2 AND "mailboxer_receipts"."trashed" = 'f' AND "mailboxer_receipts"."is_read" = 'f'  [["receiver_id", 1464], ["receiver_type", "User"]]
2015-05-16T12:17:13.453617+00:00 app[web.1]:   Mailboxer::Receipt Load (1.1ms)  SELECT "mailboxer_receipts".* FROM "mailboxer_receipts" WHERE "mailboxer_receipts"."notification_id" = $1  [["notification_id", 1209]]
2015-05-16T12:17:13.456255+00:00 app[web.1]:   Rendered conversations/_participants.html.erb (20.5ms)
2015-05-16T12:17:13.474657+00:00 heroku[router]: at=info method=GET path="/conversations" host=www.abc.com request_id=991e2d24-c507-4e5f-9b50-5678e2e3aa2c fwd="160.3.94.130" dyno=web.1 connect=1ms service=276ms status=500 bytes=1786
2015-05-16T12:17:13.569003+00:00 heroku[router]: at=info method=GET path="/speak" host=www.abc.com request_id=c1a056f3-4431-4c90-84b8-01c285e606c1 fwd="122.174.14.148" dyno=web.2 connect=1ms service=37ms status=200 bytes=35624
2015-05-16T12:17:13.459247+00:00 app[web.1]:   Mailboxer::Message Load (1.8ms)  SELECT  "mailboxer_notifications".* FROM "mailboxer_notifications" WHERE "mailboxer_notifications"."type" IN ('Mailboxer::Message') AND "mailboxer_notifications"."conversation_id" = $1  ORDER BY created_at DESC LIMIT 1  [["conversation_id", 782]]
2015-05-16T12:17:13.469138+00:00 app[web.1]:   Rendered conversations/_conversation.html.erb (233.8ms)
2015-05-16T12:17:13.469485+00:00 app[web.1]:   Rendered conversations/index.html.erb within layouts/application (249.4ms)
2015-05-16T12:17:13.469543+00:00 app[web.1]: Completed 500 Internal Server Error in 261ms
2015-05-16T12:17:13.473924+00:00 app[web.1]: 
2015-05-16T12:17:13.473928+00:00 app[web.1]: ActionView::Template::Error (undefined method `avatar' for nil:NilClass):
2015-05-16T12:17:13.473930+00:00 app[web.1]:     16:       
2015-05-16T12:17:13.473932+00:00 app[web.1]:     17:       <span class="messageuser">
2015-05-16T12:17:13.473933+00:00 app[web.1]:     18:         <%#= conversation.last_message.sender.name %>
2015-05-16T12:17:13.473936+00:00 app[web.1]:     19:         <%= link_to image_tag(conversation.last_message.sender.avatar.url(:mini), class: 'img-rounded'), user_path(conversation.last_message.sender) %>
2015-05-16T12:17:13.473944+00:00 app[web.1]:     20:         <%= link_to conversation.last_message.sender.name, user_path(conversation.last_message.sender) %>
2015-05-16T12:17:13.473946+00:00 app[web.1]:     21:       </span>
2015-05-16T12:17:13.473948+00:00 app[web.1]:     22:       
2015-05-16T12:17:13.473951+00:00 app[web.1]:   app/views/conversations/_conversation.html.erb:19:in `_app_views_conversations__conversation_html_erb___2085506579815819501_69959535266760'
2015-05-16T12:17:13.473952+00:00 app[web.1]:   app/views/conversations/index.html.erb:35:in `_app_views_conversations_index_html_erb___1748297580391940998_69959535151580'
2015-05-16T12:17:13.473954+00:00 app[web.1]: 
2015-05-16T12:17:13.473957+00:00 app[web.1]: 
2015-05-16T12:17:13.572052+00:00 app[web.1]: Started GET "/conversations" for 160.3.94.130 at 2015-05-16 12:17:13 +0000
2015-05-16T12:17:13.579974+00:00 app[web.1]:   User Load (1.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 1464]]
2015-05-16T12:17:13.585203+00:00 app[web.1]:    (0.9ms)  SELECT COUNT(*) FROM "user_learnings" WHERE "user_learnings"."user_id" = $1  [["user_id", 1464]]
2015-05-16T12:17:13.637517+00:00 app[web.1]:    (3.1ms)  SELECT DISTINCT COUNT(DISTINCT "mailboxer_conversations"."id") FROM "mailboxer_conversations" INNER JOIN "mailboxer_notifications" ON "mailboxer_notifications"."conversation_id" = "mailboxer_conversations"."id" AND "mailboxer_notifications"."type" IN ('Mailboxer::Message') INNER JOIN "mailboxer_receipts" ON "mailboxer_receipts"."notification_id" = "mailboxer_notifications"."id" WHERE "mailboxer_notifications"."type" = 'Mailboxer::Message' AND "mailboxer_receipts"."receiver_id" = $1 AND "mailboxer_receipts"."receiver_type" = $2 AND "mailboxer_receipts"."mailbox_type" = $3 AND "mailboxer_receipts"."trashed" = 'f' AND "mailboxer_receipts"."deleted" = 'f'  [["receiver_id", 1464], ["receiver_type", "User"], ["mailbox_type", "inbox"]]
2015-05-16T12:17:13.678884+00:00 app[web.1]:   Mailboxer::Receipt Load (1.2ms)  SELECT "mailboxer_receipts".* FROM "mailboxer_receipts" WHERE "mailboxer_receipts"."notification_id" = $1  [["notification_id", 1443]]
2015-05-16T12:17:13.698778+00:00 app[web.1]:   User Load (4.5ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 1464]]
2015-05-16T12:17:13.464477+00:00 app[web.1]:   User Load (1.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1  [["id", 1937]]

Answer 1

我变得不耐烦并且把它们全部摧毁了。

irb(main):002:0> Mailboxer::Conversation.destroy_all

现在错误消失了，我能够发送消息。
我不知道如何删除最近删除的800个用户的对话。

Answer 2

你是对的。 应用程序正在调用不存在的用户的方法。 例如：```

<%= link_to conversation.last_message.sender.name...

（conversation.last_message）已保存，但发件人不存在。

如果要从头开始启动数据库，可以运行（rake db：reset），这将删除创建和迁移数据库。

要解决此问题，请创建一种方法，该方法在用户每次取消或删除其帐户时运行，并删除该用户的对话。 试试这是你的控制台（rails c），它将删除第一个用户的对话。 ```

User.first.mailbox.conversations.each do |i| i.delete end

如果您仍想将对话显示给未取消其帐户的其他用户。 您必须将该名称保存在其他位置，或向用户显示发件人已删除其帐户。 ```

<% if conversation.sender == null %>
  <%= conversation.last_message %>
  <p>User of this conversation deleted his/her account</p>
<%else%>
  <%= conversation.last_message %>
  <%= conversation.last_message.sender.name %>
<% end %>

Answer 3

听起来像一个未经优化的方法，它将循环通过使用acts_as_messageable添加消息传递功能的模型。像MyModel.each do |mod| mod.mailbox.conversations.destroy_all end MyModel.each do |mod| mod.mailbox.conversations.destroy_all end