Ruby on rails heroku run rake db:migrate在控制台中键入时可以正常工作，但在通过rake任务运行时不能正常工作

我有以下任务：

task :migrate_test => :environment do
   puts 'Running database migrations ...'
   puts `heroku run rake db:migrate --app my-app`
end

当我在控制台中运行heroku run rake db:migrate--app my app时，迁移成功进行。但是，当我运行

rake migrate\u test

时，我收到以下错误：

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我相信这与rake在另一个进程中运行任务有关，该进程无法找到路径，但无法找到解决方法。

您的代码没有问题。看

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只需更新rubygems和RVM。或者更好：使用

解决方案是升级Heroku工具带。我仍然收到一个错误

/Users/Will/.rvm/gems/ruby-1.9.3-p194@global/bin/rake：没有这样的文件或目录

，但我想工具带足够聪明，可以进行补偿。最新的工具带可在此处找到：

我还建议在rake任务中使用

exec…

，而不是

put…

，因为您可以实时查看进度

Running database migrations ...
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/dependency.rb:52:in `initialize': Valid types are [:development, :runtime], not nil (ArgumentError)
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:371:in `new'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:371:in `search'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:361:in `gems_size'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:159:in `start'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:159:in `map'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:159:in `start'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:128:in `resolve'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:127:in `catch'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/resolver.rb:127:in `resolve'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/definition.rb:182:in `resolve'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/definition.rb:113:in `specs'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/definition.rb:162:in `specs_for'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/definition.rb:151:in `requested_specs'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/environment.rb:23:in `requested_specs'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/runtime.rb:11:in `setup'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler.rb:116:in `setup'
    from /Users/Will/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.2.0/lib/bundler/setup.rb:17