对Rails来说很新，所以忍受我 -
目前偏执地认为我的ruby和gem版本不是最新的，因为我在运行rails test时偶尔会收到错误消息。之前已经安装了rvm和rbenv，但哇我已经删除了两个并重新安装了rvm。
当我进入irb并调用无效的操作时，例如："foo".select，我收到一条简单的错误消息：
NoMethodError: private method 'select' called for "foo":String
from (irb):4
from /Users/Joseph/.rvm/rubies/ruby-2.3.1/bin/irb:11:in '<main>'
但是，当我在"foo".select中输入相同的命令rails console时，我得到：
NoMethodError: private method `select' called for "foo":String
from (irb):1
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/console.rb:65:in `start'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/console_helper.rb:9:in `start'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:78:in `console'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in require'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
from /Users/Joseph/workspace/sample_app/bin/rails:9:in `<top (required)>'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `block in load'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/commands/rails.rb:6:in `call'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/command_wrapper.rb:38:in `call'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:191:in `block in serve'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:161:in `fork'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:161:in `serve'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:131:in `block in run'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:125:in `loop'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:125:in `run'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application/boot.rb:19:in `<top (required)>'
from /Users/Joseph/.rvm/rubies/ruby-2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/Joseph/.rvm/rubies/ruby-2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'
这是正常的吗？或者这里的宝石出了什么问题？
答案 0 :(得分：2)
你的宝石没什么问题。问题在于，当你运行irb时，就是这样。你只运行ruby interactive。
当您运行rails console以向您显示控制台时，需要使用ActiveRecord，rails core等为您设置它。所以这（下面）就是在它设置之前所做的全部。< / p>
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/console.rb:65:in `start'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/console_helper.rb:9:in `start'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:78:in `console'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in require'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
from /Users/Joseph/workspace/sample_app/bin/rails:9:in `<top (required)>'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `block in load'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/commands/rails.rb:6:in `call'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/command_wrapper.rb:38:in `call'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:191:in `block in serve'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:161:in `fork'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:161:in `serve'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:131:in `block in run'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:125:in `loop'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application.rb:125:in `run'
from /Users/Joseph/.rvm/gems/ruby-2.3.1@sample_app/gems/spring-1.7.2/lib/spring/application/boot.rb:19:in `<top (required)>'
from /Users/Joseph/.rvm/rubies/ruby-2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/Joseph/.rvm/rubies/ruby-2.3.1/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'
请注意，irb的执行速度非常快，而rails console需要时间，具体取决于您的初始化程序，配置等。