邮箱：无法销毁对象答案

【问题标题】：Mailboxer: cannot destroy object邮箱：无法销毁对象
【发布时间】：2017-01-31 11:49:15
【问题描述】：

我正在尝试销毁我的 ROR 应用程序中的一个对象。

但我收到以下错误：

ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR:  relation "mailboxer_conversation_opt_outs" does not exist
LINE 5:                WHERE a.attrelid = '"mailboxer_conversation_o...
                                          ^
:               SELECT a.attname, format_type(a.atttypid, a.atttypmod),
                     pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
                FROM pg_attribute a LEFT JOIN pg_attrdef d
                  ON a.attrelid = d.adrelid AND a.attnum = d.adnum
               WHERE a.attrelid = '"mailboxer_conversation_opt_outs"'::regclass
                 AND a.attnum > 0 AND NOT a.attisdropped
               ORDER BY a.attnum

    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `async_exec'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `block in exec_no_cache'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract_adapter.rb:472:in `block in log'
    from /app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.5.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract_adapter.rb:466:in `log'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `exec_no_cache'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:584:in `execute_and_clear'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:160:in `exec_query'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:733:in `column_definitions'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql/schema_statements.rb:186:in `columns'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/schema_cache.rb:43:in `columns'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/schema_cache.rb:49:in `columns_hash'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/associations/association_scope.rb:85:in `column_for'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/associations/association_scope.rb:94:in `bind'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/associations/association_scope.rb:103:in `last_chain_scope'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/associations/association_scope.rb:139:in `add_constraints'
... 72 levels...
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/transactions.rb:281:in `block in destroy'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/transactions.rb:351:in `block in with_transaction_returning_status'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/transactions.rb:220:in `transaction'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/transactions.rb:348:in `with_transaction_returning_status'
    from /app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.5.1/lib/active_record/transactions.rb:281:in `destroy'
    from (irb):5
    from /app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/console.rb:110:in `start'
    from /app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/console.rb:9:in `start'
    from /app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.5.1/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:4:in `require'

我猜这与我的应用程序中没有的 mailboxer_conversation_opt_outs 表有关。

我正在使用 Rails 4.2 并且：

mailboxer (0.13.0)
  carrierwave (>= 0.5.8)
  foreigner (>= 0.9.1)
  rails (>= 3.2.0)

有没有我错过的迁移文件？

我的对象怎么连接到这张表，而实际的对象却不能发送消息？

谢谢

【问题讨论】：

你试过运行rake db:migrate吗？你的schema_migrations 表中有20131206080416_add_conversation_optout 吗？
不。我猜这个迁移是在我一开始（大约 3 年前）设置邮箱之后添加的，对吧？我应该如何赶上这个？
好吧，我会看看您的schema_migrations 表中是否存在该迁移。在我的本地，我会删除数据库并重新创建它并再次运行迁移，看看是否解决了它
迁移不存在，我的问题正在生产中发生，所以我不能删除我的数据库...如果这是来自较新版本，我想应该有一些升级步骤我错过了什么？

标签： ruby-on-rails mailboxer

【解决方案1】：

有没有我错过的迁移文件？

是的，请参阅文档的 itsnikolay's answer 和 Upgrading 部分。

我的对象怎么连接到这张表上，而实际的对象却不能发送消息？

您的 Model 类可能仍在调用 acts_as_messageable 方法，该方法将 Mailboxer::Models::Messageable 模块包含到您的 ActiveRecord 类中，而 declares several extra associations 在您的模型上。如果您不关心升级 Mailboxer 并且只想完全断开您的模型与 Mailboxer 的连接，只需删除 acts_as_messageable 行，您应该能够销毁您的记录，而不会再出现任何失败的关联问题。

【讨论】：

【解决方案2】：

您使用的好像是以前版本的 Mailboxer。

尝试迁移到新的：

$ rails generate mailboxer:namespacing_compatibility
$ rails generate mailboxer:install -s
$ rake db:migrate

取自文档：https://github.com/mailboxer/mailboxer#upgrading

【讨论】：