当我转到heroku run rake时，Rake被中止，下一行说，Don't know how to build task 'default'
运行heroku run rake --trace并获得
Running `rake --trace` attached to terminal... up, run.3479
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)
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)
rake aborted!
Don't know how to build task 'default'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/task_manager.rb:49:in `[]'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:148:in `invoke_task'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:106:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:106:in `block in top_level'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:115:in `run_with_threads'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:100:in `top_level'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:78:in `block in run'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/lib/rake/application.rb:75:in `run'
/app/vendor/bundle/ruby/2.0.0/gems/rake-10.1.0/bin/rake:33:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/bin/rake:23:in `load'
/app/vendor/bundle/ruby/2.0.0/bin/rake:23:in `<main>'
这个错误是什么意思？
Rake是一个实用程序的名称-请参阅此处的更多信息-因此您不能只调用该实用程序。这就像打开你的网络浏览器，期望它在没有任何指示的情况下为你自己做一些事情。
尝试运行其中一个：
heroku run rake db:create
heroku run rake db:schema:load
git push heroku master<在运行此命令之前，请确保您已将希望在heroku上显示的内容推送到github。
运行rake任务的基本语法是：
rake [taskname]
如果不指定taskname，rake将尝试执行一个名为default的特殊任务。您可以指定名为default的任务，也可以将任务与default链接，如下所示：
task :default => "taskname"
由于在rake文件中没有指定默认任务，因此会出现此错误。
我猜您正试图将数据库部署到heroku。对于刚刚运行的：
heroku run rake db:migrate