可能重复：
eliminating Rails 2.3-style plugins and deprecation warnings
当我执行heroku run console时，我收到以下错误：
$ heroku run console
Running `console` attached to terminal... up, run.1
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 an d 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/config/environment.rb:5)
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 an d 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/config/environment.rb:5)
Connecting to database specified by DATABASE_URL
Loading production environment (Rails 3.2.8)
irb(main):001:0>
但是，我在vendor / plugins中的唯一文件是.gitkeep：
$ ls -lha vendor/plugins/
total 0
drwxr-xr-x 1 Scott Administ 0 Sep 7 12:26 .
drwxr-xr-x 1 Scott Administ 0 Sep 7 12:26 ..
-rw-r--r-- 1 Scott Administ 0 Sep 7 12:26 .gitkeep
我甚至尝试删除.gitkeep文件，但仍然会收到相同的弃用警告。我有不好的插件吗？这是一个相对较新的Rails项目。
答案 0 :(得分：8)
Heroku注入旧式插件，使您的应用程序在其服务器上运行（特别是将日志重定向到stdout，并从rails提供静态资产）。检查git push的输出......你会看到类似这样的内容
-----> Rails plugin injection
Injecting rails_log_stdout
Injecting rails3_serve_static_assets
所以这不是你做过的事情，也不用担心！这些在Rails 3.x上运行得很好，当Rails 4更成熟时，Heroku无疑会有所帮助。