STI是否仍与Rails 3.1 rc不兼容？

如何解决STI是否仍与Rails 3.1 rc不兼容？

| 在Ryan Bates的[Railcast] [1]之后，我重新安装了Rails 3.1 rc。似乎每个STI实现都会引发相同的错误（如下所述）。对于其他所有模型，都不会发生任何问题。这是一个已知的问题？可能是个错误？还是我的末端缺少什么？有人遇到相同的错误吗？媒体模型是STI。事件模型继承自Media模型。型号定义：

class Media < ActiveRecord::Base
  belongs_to :user
  ....
end

class Event < Media
  ...
end

在控制台中，我这样做：

ruby-1.9.2-p136 :009 > Event.count
Creating scope :page. Overwriting existing method Event.page.
ActiveRecord::StatementInvalid: PGError: ERROR:  relation \"media\" does not exist
LINE 4:              WHERE a.attrelid = \'\"media\"\'::regclass
                                        ^
:             SELECT a.attname,format_type(a.atttypid,a.atttypmod),d.adsrc,a.attnotnull
              FROM pg_attribute a LEFT JOIN pg_attrdef d
                ON a.attrelid = d.adrelid AND a.attnum = d.adnum
             WHERE a.attrelid = \'\"media\"\'::regclass
               AND a.attnum > 0 AND NOT a.attisdropped
             ORDER BY a.attnum

  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/postgresql_adapter.rb:958:in `async_exec\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/postgresql_adapter.rb:958:in `exec_no_cache\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/postgresql_adapter.rb:547:in `block in exec_query\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract_adapter.rb:222:in `block in log\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/notifications/instrumenter.rb:21:in `instrument\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract_adapter.rb:217:in `log\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/postgresql_adapter.rb:546:in `exec_query\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/postgresql_adapter.rb:1057:in `column_deFinitions\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/postgresql_adapter.rb:736:in `columns\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_pool.rb:93:in `block (2 levels) in initialize\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_pool.rb:174:in `with_connection\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_pool.rb:90:in `block in initialize\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_pool.rb:104:in `yield\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_pool.rb:104:in `default\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/connection_adapters/abstract/connection_pool.rb:104:in `block in initialize\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activerecord-3.1.0.rc1/lib/active_record/base.rb:709:in `yield\'
... 8 levels...
  from /Users/Chris/Sites/site_name.1/app/models/event.rb:1:in `<top (required)>\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:452:in `load\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:452:in `block in load_file\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:639:in `new_constants_in\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:451:in `load_file\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:338:in `require_or_load\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:489:in `load_missing_constant\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:181:in `block in const_missing\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:179:in `each\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/activesupport-3.1.0.rc1/lib/active_support/dependencies.rb:179:in `const_missing\'
  from (irb):9
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/railties-3.1.0.rc1/lib/rails/commands/console.rb:44:in `start\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/railties-3.1.0.rc1/lib/rails/commands/console.rb:8:in `start\'
  from /Users/Chris/.rvm/gems/ruby-1.9.2-p136@railspre/gems/railties-3.1.0.rc1/lib/rails/commands.rb:40:in `<top (required)>\'
  from script/rails:6:in `require\' from script/rails:6:in


  [1]: http://railscasts.com/episodes/265-rails-3-1-overview

解决方法

好，找到问题了。实际上很有趣。在3.0及更高版本中，\'media \'。pluralize返回\'medias \'。在3.1中，\'media \'。pluralize返回\'media \'。这意味着，对于3.1，媒体的单数形式应为中等。

STI是否仍与Rails 3.1 rc不兼容？

如何解决STI是否仍与Rails 3.1 rc不兼容？

解决方法

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