小编Pro*_*opS的帖子

你知道如何在我的应用程序中显示 gem 的版本吗？我不需要 rake 任务，我想在管理页面中显示版本。

比如“Gem::Version('bundler')”

Rails服务器运行正常,但rails控制台无法启动......可能出错？

user@user-pc:~/Sites/refcms_test$ bundle install
...#installing
Your bundle is complete!    
Use `bundle show [gemname]` to see where a bundled gem is installed.    

user@user-pc:~/Sites/refcms_test$ bundle exec thin start  
Using rack adapter    

-- DEPRECATION WARNING --    
The use of 'Refinery::Plugin#activity=' is deprecated and will be removed at version 3.1.    
Thin web server (v1.6.3 codename Protein Powder)    
Maximum connections set to 1024    
Listening on 0.0.0.0:3000, CTRL+C to stop

服务器运行...但控制台不...

user@user-pc:~/Sites/refcms_test$ bundle install
...#installing
Your bundle is complete!    
Use `bundle show [gemname]` to see where …

对于PostgreSQL或MySQL的Ruby on Rails中的事务的默认隔离级别是什么？

active_record/connection_adapters /抽象/ database_statements.rb#L173

a = ["1", "2", " ", nil]

- 验证:是否填充了所有元素？(不是零,不是空白)

如何？