“actionmailer”的未定义方法“name”：String
我有一个旧版本的Rails项目，它是在config / environment文件中使用BrowserCMS构建的
RAILS_GEM_VERSION = '2.3.4' unless defined? RAILS_GEM_VERSION 所以我使用rvm安装了这个gem，所以我可以运行它
$ gem list *** LOCAL GEMS *** actionmailer (2.3.8, 2.3.4) actionpack (2.3.8, 2.3.4) activerecord (2.3.8, 2.3.4) activeresource (2.3.8, 2.3.4) activesupport (2.3.8, 2.3.4) bundler (1.1.4) mysql (2.8.1) rack (1.1.3, 1.0.1) rails (2.3.4) rake (0.8.7)
我运行rake db:create它工作正常，但是当我运行rake db:migrate了这个错误
rake aborted! undefined method `name' for "actionmailer":String
我尝试过使用Trace，但我没有得到任何帮助
$ rake db:migrate --trace (in /home/azzurrio/Desktop/berkmancenter-fair_use_tool-f8f65ea) ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** Execute environment rake aborted! undefined method `name' for "actionmailer":String /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/rails/gem_dependency.rb:268:in `==' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/dependency.rb:217:in `===' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/dependency.rb:217:in `matching_specs' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `find_all' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/specification.rb:411:in `each' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/specification.rb:410:in `each' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/dependency.rb:216:in `find_all' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/dependency.rb:216:in `matching_specs' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/dependency.rb:238:in `to_specs' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/dependency.rb:256:in `to_spec' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems.rb:1210:in `gem' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/rails/gem_dependency.rb:73:in `add_load_paths' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/initializer.rb:301:in `add_gem_load_paths' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/initializer.rb:301:in `each' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/initializer.rb:301:in `add_gem_load_paths' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/initializer.rb:132:in `process' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/initializer.rb:113:in `send' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/initializer.rb:113:in `run' /home/azzurrio/Desktop/berkmancenter-fair_use_tool-f8f65ea/config/environment.rb:9 /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rails-2.3.4/lib/tasks/misc.rake:4 /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:636:in `call' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:631:in `each' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:631:in `execute' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/1.8/monitor.rb:242:in `synchronize' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:604:in `each' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' /usr/share/ruby-rvm/rubies/ruby-1.8.7-p358/lib/ruby/1.8/monitor.rb:242:in `synchronize' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2029:in `each' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2001:in `run' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/lib/rake.rb:1998:in `run' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/gems/rake-0.8.7/bin/rake:31 /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/bin/rake:19:in `load' /usr/share/ruby-rvm/gems/ruby-1.8.7-p358/bin/rake:19
有什么帮助吗？
我有这个问题。 解决方案是将rubygems降级到您支持的版本。
我需要1.3.5版本（用于rails 2.3.5）
所以你需要这样做：
gem install rubygems-update -v 1.3.5
update_rubygems –version = 1.3.5
而现在耙应该工作。
我认为你应该更新RubyGems版本。
尝试gem install rubygems-update 。