无法在Rails 2.3.4上生成迁移

Question

我以前曾经使用过Rails 2.3.2，然后决定升级到2.3.4版本。

今天，我尝试生成一个迁移（我可以在2.3.2版中做到这一点），并收到以下错误消息：

C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:812:in `const_missing': uninitialized constant ActiveSupport (NameError)
        from D:/Proyectos/Cursometro/www/config/environment.rb:33
        from C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:111:in `run'
        from D:/Proyectos/Cursometro/www/config/environment.rb:15
        from D:/Proyectos/Cursometro/www/config/environment.rb:31:in `require'
        from C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/commands/generate.rb:1
        from C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/commands/generate.rb:31:in `require'
        from C:/Program Files (x86)/NetBeans 6.8/ruby2/jruby-1.4.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from script\generate:3

我不知道为什么会这样。 一切在2.3.2中都可以正常运行，但现在却没有。

Answer 1

您的计算机上未安装Activesupport gem。 尝试运行以下命令：

gem install activesupport

如果它不起作用，请尝试此

gem update --system
gem update --source http://gems.rubyonrails.org

Answer 2

好吧，我可以通过在Rails::Initializer.run do |config|放置下面的行（如下编写）来解决此问题 块结束（它在此块之前）。

ActiveSupport::CoreExtensions::Time::Conversions::DATE_FORMATS.merge!(:standard => "%B %d, %Y")