在我最近的提交中，我在名为 Submissions 的表/模型中添加了一个名为“accepted”的布尔列。它在我的测试和开发环境中迁移得很好，但是当我将它推送到 Heroku 时，它似乎不起作用。推动后我使用：
heroku run rake db:migrate
这是输出：
Running `rake db:migrate` attached to terminal... up, run.2430
DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:7)
DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:7)
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Starting the New Relic Agent.
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Environment: production
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Dispatcher: thin
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Application: chicagoimprovfestival
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Installing ActiveRecord instrumentation
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Installing Net instrumentation
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Installing Rails 3 Controller instrumentation
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Installing Rails 3.1/3.2 view instrumentation
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Installing Rails3 Error instrumentation
** [NewRelic][01/29/13 23:23:10 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Finished instrumentation
** [NewRelic][01/29/13 23:23:12 +0000 0d3d429d-5437-42d0-9c57-e15606717231 (2)] INFO : Starting Agent shutdown
在日志中，我收到此错误：
ActionView::Template::Error (undefined method `accepted' for #<Submission:0x00000005e71080>):
当然，我在开发中不会遇到这样的错误。有什么建议吗？我的迁移失败了吗？