WEBrick无法启动默认导轨应用程序：“未初始化的常量ActiveRecord :: ConnectionAdapters :: Column :: Format”

我试图在Windows机器上开始Ruby on Rails开发，但是我无法获取WEBrick以启动默认的Rails应用程序。WEBrick无法启动默认导轨应用程序：“未初始化的常量ActiveRecord :: ConnectionAdapters :: Column :: Format”

下面是从我试图创建和启动应用程序的输出：

C:\Users\my_user>ruby -v 
ruby 2.2.4p230 (2015-12-16 revision 53155) [i386-mingw32] 

C:\Users\my_user\Desktop\wkspc>rails new sample_app 
[...] 
Bundle complete! 11 Gemfile dependencies, 57 gems now installed. 
Use `bundle show [gemname]` to see where a bundled gem is installed. 

C:\Users\my_user\Desktop\wkspc>cd sample_app 

C:\Users\my_user\Desktop\wkspc\sample_app>rails server 
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from require at bin/rails:4) 
Bundler::GemRequireError: There was an error while trying to load the gem 'activerecord-jdbcsqlite3-adapter'. 
Gem Load Error is: uninitialized constant ActiveRecord::ConnectionAdapters::Column::Format 
Backtrace for gem load error is: 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/type_cast.rb:13:in `<module:TypeCast>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/type_cast.rb:7:in `<module:Jdbc>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/type_cast.rb:4:in `<module:ConnectionAdapters>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/type_cast.rb:3:in `<top>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/column.rb:1:in `singleton class' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/column.rb:70:in `<class:singleton class>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/column.rb:68:in `<module:JdbcColumn>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/column.rb:12:in `<module:ConnectionAdapters>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/column.rb:2:in `<top>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/column.rb:1:in `<top>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/adapter.rb:1:in `require' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/adapter.rb:1:in `<module:(root)>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc/adapter.rb:9:in `<top>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc.rb:1:in `require' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc.rb:1:in `<top>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc.rb:52:in `require' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc.rb:52:in `<top>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc.rb:3:in `require' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc/jdbc.rb:3:in `block in (root)' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc.rb:1:in `each' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc.rb:1:in `block in (root)' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc.rb:9:in `each' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbc-adapter-1.3.20/lib/arjdbc.rb:9:in `(root)' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbcsqlite3-adapter-1.3.20/lib/activerecord-jdbcsqlite3-adapter.rb:1:in `(root)' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/activerecord-jdbcsqlite3-adapter-1.3.20/lib/activerecord-jdbcsqlite3-adapter.rb:2:in `<top>' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:1:in `require' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:1:in `block in (root)' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:in `tap' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:in `require' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:81:in `require' 
C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:70:in `<top>' 
bin/rails:4:in `require' 
bin/rails:4:in `<top>' 
Bundler Error Backtrace: 

    block in require at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:90 
       each at org/jruby/RubyArray.java:1593 
    block in require at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:81 
       each at org/jruby/RubyArray.java:1593 
      require at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler/runtime.rb:70 
      require at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/bundler-1.12.5/lib/bundler.rb:102 
      <top> at C:/Users/my_user/Desktop/wkspc/sample_app/config/application.rb:7 
      require at org/jruby/RubyKernel.java:944 
    block in (root) at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:1 
       tap at org/jruby/RubyKernel.java:1743 
      server at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:88 
      server at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:85 
      <top> at C:/jruby-9.1.2.0/lib/ruby/gems/shared/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:49 
      require at org/jruby/RubyKernel.java:944 
      <top> at bin/rails:4

看来好像这个问题是从宝石的ActiveRecord-jdbcsqlite3适配器“的到来，以及错误指示 uninitialized constant ActiveRecord::ConnectionAdapters::Column::Format

我跳过了一些重要的配置步骤吗？谢谢你的帮助！

来源

2016-07-22 Jay Kelner

一点也没有”看起来你运行'rake db：create'来创建数据库。 – covard

谢谢，我认为这可能是一个很好的开始：我试着运行'rake db：create'，并且有趣的是，它输出与上面相同的错误，就像我再次运行'rails server'一样。 –

有趣。你可能想看看[gorails]（https://gorails.com/dashboard）来设置一切。他们有针对所有平台的指南，即（OS X，Linux，Windows），我注意到你在windows上。所以这可能是一个很好的开始。这里是[指南]（https://gorails.com/setup/windows/10） – covard

据this issue，ActiveRecord的-JDBC适配器仍然有Rails中5兼容性问题存在于轨道-5可以使用这条线在你的Gemfile使用分支：

gem 'activerecord-jdbc-adapter', :git => "https://github.com/jruby/activerecord-jdbc-adapter.git", 
           :branch => "rails-5"

来源

2016-07-22 15:38:56

谢谢，这个问题看起来很有希望。可悲的是，加入到我的Gemfile产生'[致命]：读取错误：无效参数' –

明白了。问题在于我们试图指定回购的方式。这里是修复它：我用'gem'activerecord-jdbc-adapter'，：git =>“https://github.com/jruby/activerecord-”替换了我的Gemfile中的'gem'activerecord -jdbcsqlite3-adapter''行。 jdbc-adapter.git“，：branch =>”rails-5“'。然后，我运行'bundle install'和'rails server'，它现在正在运行。非常感谢！ –

'git_source（：github）{| repo_name | “https://github.com/#{repo_name}.git”}; gem'activerecord-jdbc-adapter'，'〜> 1.3.21'，github：'jruby/activerecord-jdbc-adapter'，分支：'rails-5'' – Barry

WEBrick无法启动默认导轨应用程序：“未初始化的常量ActiveRecord :: ConnectionAdapters :: Column :: Format”

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