ruby-on-rails - 尝试运行 rake db :migrate 时出错

Question

当我尝试命令 rake db:migrate 时出现以下错误

> NOTE: Gem.source_index is deprecated, use Specification. It will be
> removed on or after 2011-11-01. Gem.source_index called from
> /home/hilarl/workspace/depot/vendor/rails/railties/lib/rails/gem_dependency.rb:21.
> NOTE: Gem::SourceIndex#initialize is deprecated with no replacement.
> It will be removed on or after 2011-11-01. Gem::SourceIndex#initialize
> called from
> /home/hilarl/workspace/depot/vendor/rails/railties/lib/rails/vendor_gem_source_index.rb:100.
> NOTE: Gem::SourceIndex#add_spec is deprecated, use
> Specification.add_spec. It will be removed on or after 2011-11-01.
> Gem::SourceIndex#add_spec called from
> /home/hilarl/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/source_index.rb:91.
> NOTE: Gem::SourceIndex#add_spec is deprecated, use
> Specification.add_spec. It will be removed on or after 2011-11-01.
> Gem::SourceIndex#add_spec called from
> /home/hilarl/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/source_index.rb:91.
> NOTE: Gem::SourceIndex#add_spec is deprecated, use
> Specification.add_spec. It will be removed on or after 2011-11-01.
> Gem::SourceIndex#add_spec called from
> /home/hilarl/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/source_index.rb:91.
> NOTE: Gem::SourceIndex#add_spec is deprecated, use
> Specification.add_spec. It will be removed on or after 2011-11-01.
> Gem::SourceIndex#add_spec called from
> /home/hilarl/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/source_index.rb:91.
> NOTE: Gem::SourceIndex#add_spec is deprecated, use
> Specification.add_spec. It will be removed on or after 2011-11-01.
> Gem::SourceIndex#add_spec called from
> /home/hilarl/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/source_index.rb:91.
> NOTE: Gem::SourceIndex#add_spec is deprecated, use
> Specification.add_spec. It will be removed on or after 2011-11-01.
> Gem::SourceIndex#add_spec called from
> /home/hilarl/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/source_index.rb:91.
> WARNING: 'require 'rake/rdoctask'' is deprecated.  Please use 'require
> 'rdoc/task' (in RDoc 2.4.2+)' instead.
>     at /home/hilarl/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/rdoctask.rb
> rake aborted! can't activate activesupport-3.2.3, already activated
> activesupport-2.3.14
> 
> (See full trace by running task with --trace)

知道为什么会这样吗？我正在使用 ubuntu，在我的系统上安装了 ruby​​ 1.9.3-p194 和 rails 2.3.14 并使用 sqlite3

Answer 1

检查你安装的rails版本:

$ gem list rails

*** LOCAL GEMS ***

rails (3.2.3, 2.3.14)

你应该有多个，就像我在这里做的 3.2.3 和 2.3.14

然后卸载你不需要的:

$ gem uninstall rails -v2.3.14
Remove executables:
    rails

in addition to the gem? [Yn]  Y
Removing rails
Successfully uninstalled rails-2.3.14

最后你应该只有一个版本的 rails:

$ gem list rails

*** LOCAL GEMS ***

rails (3.2.3)