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ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0] rvm 1.14.5 (stable) by Wayne E. Seguin <>, Michal Papis <> [] MongoDB db version v2.0.6, pdfile version 4.5 在enviroment.rb中添加config.gem "mongo_mapper" 如启动报config变量无法找到，则修改config.gem "mongo_mapper"为$config.gem "mongo_mapper" /Users/seraph/Documents/rails_projects/mongodemo/config/environment.rb:7:in `<top (required)>': undefined local variable or method `config' for main:Object (NameError) 在config/initalizers中添加文件mongo_config.rb 内容：MongoMapper.database = "mongodemo-#{Rails.env}" source "" gem 'mongo_mapper', github: "jnunemaker/mongomapper" gem "nifty-generators", :group => :development rails generate scaffold project name:string --orm=mongo_mapper rails generate scaffold task project_id:string name:string completed:boolean --orm=mongo_mapper 1.问题：启动Rails服务器如报如下异常，说明没有安装bson_ext. gem install bson_ext If you continue to receive this message after installing, make sure that the bson_ext gem is in your load path and that the bson_ext and mongo gems are of the same version.
2.问题：在使用nifty生成代码时，如报如下异常，需执行：gem install nifty-generators rails g nifty:scaffold Recipe name:string index new /Users/seraph/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.4/lib/bundler/resolver.rb:287:in `resolve': Could not find gem 'nifty-generators (>= 0) ruby' in the gems available on this machine. (Bundler::GemNotFound) 3.问题：mongodb演示，访问时，报异常：undefined method `key?' for nil:NilClass Explanation: Rails 3.2.4 added a accessible_attributes method to ActiveModel, but MongoMapper already had this; so they were clobbering each other. ArgumentError (wrong number of arguments (1 for 0)): app/controllers/projects_controller.rb:1:in `<top (required)>'
5.问题：如果访问MongoDB页面时，页面提示需开启rest，则在/usr/local/mongodb/mongod.conf文件中添加 # Store data alongside MongoDB instead of the default, /data/db/ dbpath = /usr/local/mongodb_data # Only accept local connections # Seraph add, to enable REST 转载地址：http://gjhdi.baihongyu.com/