无法生成 Ruby 迁移

Question

我想为运行 Rails 2.3.14 和 Ruby 1.8.7 的站点生成新的迁移。我写了命令

ruby script/generate migration AssetTable

期望脚本在 db/migrate 目录下生成文件 20130522161112_asset_table.rb。但我没有看到这个文件。运行上述命令后得到的输出是：

/var/lib/gems/1.8/gems/rails-2.3.14/lib/rails/gem_dependency.rb:81:in `add_load_paths':      undefined method `requirement' for #<Rails::GemDependency:0x7ffd183eba58> (NoMethodError)
    from /var/lib/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:301:in `add_gem_load_paths'
    from /var/lib/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:301:in `each'
    from /var/lib/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:301:in `add_gem_load_paths'
    from /var/lib/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:132:in `process'
    from /var/lib/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:113:in `send'
    from /var/lib/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:113:in `run'
    from /var/www/pbcore/releases/20120416101734/config/environment.rb:17
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /var/lib/gems/1.8/gems/rails-2.3.14/lib/commands/generate.rb:1
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require

有谁知道我在这里做错了什么？

Answer 1

根据您的 ruby​​gems 版本，您可以尝试运行吗：

$ gem install rubygems-update -v='1.4.2'
$ gem uninstall rubygems-update -v='1.5.0'
$ update_rubygems

在这里看到：Gem dependency error in rails 2.3.4：

发生这种情况是因为您安装的 RubyGems 对您来说太新了 你的 Rails 版本。降级（并重新运行 update_rubygems） 或将 Rails 升级到 2.3.11。