Rails 4：一起使用MySql和MongoDB

Question

我正在尝试使用MongoDB（mongoid）和MySQL一起在rails 4中创建应用程序。 但是我无法设置它。

我正在按照以下步骤操作：

1. rails new myapp -d mysql
2. 然后将这些行添加到Gemfile中：
    gem "mongoid"
 gem "bson_ext"
3. bundle install
4. rails g mongoid:config

第4步失败。我无法弄清楚问题所在。它显示以下错误。

  

/home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid/associations.rb:5:in require': /home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid/associations/has_many.rb:79: syntax error, unexpected keyword_do_cond, expecting ':' @documents = attributes ? attributes.collect do |attrs| ^ /home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid/associations/has_many.rb:84: syntax error, unexpected ':', expecting keyword_end end : [] ^ /home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid/associations/has_many.rb:99: syntax error, unexpected keyword_do_cond, expecting keyword_end attributes.values.each do |attrs| ^ /home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid/associations/has_many.rb:139: syntax error, unexpected keyword_end, expecting end-of-input (SyntaxError) from /home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid/associations.rb:5:in'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid.rb:40:in require' from /home/devesh/.rvm/gems/ruby-2.2.2/gems/mongoid-1.0.6/lib/mongoid.rb:40:in'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in require' from /home/devesh/.rvm/gems/ruby-2.2.2/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in块（2级）in require'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in each' from /home/devesh/.rvm/gems/ruby-2.2.2/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in块中的'require'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in each' from /home/devesh/.rvm/gems/ruby-2.2.2/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in require'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/bundler-1.10.6/lib/bundler.rb:134:in require' from /home/devesh/fashion_hub/store/config/application.rb:7:in'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/spring-1.3.6/lib/spring/application.rb:82:in require' from /home/devesh/.rvm/gems/ruby-2.2.2/gems/spring-1.3.6/lib/spring/application.rb:82:in preload'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/spring-1.3.6/lib/spring/application.rb:143:in serve' from /home/devesh/.rvm/gems/ruby-2.2.2/gems/spring-1.3.6/lib/spring/application.rb:131:in阻止运行'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/spring-1.3.6/lib/spring/application.rb:125:in loop' from /home/devesh/.rvm/gems/ruby-2.2.2/gems/spring-1.3.6/lib/spring/application.rb:125:in run'       来自/home/devesh/.rvm/gems/ruby-2.2.2/gems/spring-1.3.6/lib/spring/application/boot.rb:18:in <top (required)>' from /home/devesh/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in require'       来自/home/devesh/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in`requiret'

我关注此url。

一些细节：

1. OS - ubuntu 14.04
2. ruby​​ v2.2.2
3. rails 4.2.3