Question

我有一个ruby-on-rails应用程序。我使用Mongoid 4.0，现在更新到5.0。当我在命令下运行时：

rails s

但收到错误：

config/application.rb:56:in `<class:Application>': uninitialized constant AppName::Application::Moped (NameError)
    from config/application.rb:22:in `<module:ModeTokyo>'
    from config/application.rb:21:in `<top (required)>'
    from vendor/bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/application.rb:82:in `require'
    from vendor/bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/application.rb:82:in `preload'
    from vendor/bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/application.rb:143:in `serve'
    from vendor/bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/application.rb:131:in `block in run'
    from vendor/bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/application.rb:125:in `loop'
    from vendor/bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/application.rb:125:in `run'
    from vendor/bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/application/boot.rb:18:in `<top (required)>'
    from /Users/nora/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/nora/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from -e:1:in `<main>'

我该如何解决此错误？

Answer 1

这是因为config/application.rb中的语句无效，自Mongoid 5以来无效。

我应该改变这一行：

Moped.logger.level = Logger::DEBUG

成：

Mongo::Logger.logger.level = Logger::DEBUG

这份文件会有所帮助：

http://docs.mongodb.org/ecosystem/tutorial/ruby-mongoid-tutorial/#logging

将Mongoid从4升级到5

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