小编cia*_*win的帖子

我有点阵:

@dates= ['2013-11-01', '2013-11-02', '2013-11-03', '2013-11-04', '2013-11-05']

我如何将这些数组放在视图中的collection_select中？我试过了:

...    
<%= f.collection_select :day, Day.order(:date), :id, @dates, include_blank: false %>
...

在哪里可以更改Openstack中Dasboard的管理员密码？

我用packstack安装程序安装了openstack ......

keystonerc_admin文件中的密码也不起作用.

我使用CentOS 6.3(我可以访问配置文件)

用户名:admin密码:admin/password/123/etc. 不工作..

是否有一个语法允许我在同一行中读取用户的输入System.out.println() line？

例:

What is your name?:(<-- Output)    Jack (<-- Input from user in the same line)   

我正试图在debian上的rails上安装ruby ......我安装了一切.

我也安装了execjs,therubyracer和node.js.

每次我想创建一个新的控制器,它说:

/usr/local/lib/ruby/gems/2.0.0/gems/execjs-2.0.2/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /usr/local/lib/ruby/gems/2.0.0/gems/execjs-2.0.2/lib/execjs.rb:5:in `<module:ExecJS>'
    from /usr/local/lib/ruby/gems/2.0.0/gems/execjs-2.0.2/lib/execjs.rb:4:in `<top (required)>'
    from /usr/local/lib/ruby/gems/2.0.0/gems/uglifier-2.2.1/lib/uglifier.rb:3:in `require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/uglifier-2.2.1/lib/uglifier.rb:3:in `<top (required)>'
    from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
    from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
    from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
    from /home/adattilo/test/testt/config/application.rb:7:in `<top (required)>'
    from /usr/local/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/commands.rb:44:in `require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/railties-4.0.0/lib/rails/commands.rb:44:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

安装execjs,therubyracer和node.js之后我重启了......