小编pos*_*eid的帖子

这是如何运作的？

in irb:

>> class A
>>   b = [1, 2,3]
>> end
=> [1, 2, 3]

b是实例变量吗？类变量？我如何从课外访问b？它用于元编程吗？

为了调试我需要转储嵌套映射的内容.我试着在下面的代码中描述这个:

struct Foo
{       
   string name;
};

typedef std::map<string, Foo> MapFoo;

struct Bar  {
  string name;    
  MapFoo mapFoo;
};

typedef std::map<string, Bar> MapBar;

...

MapBar mapBar = init_mapBar(); 

const MapBar::const_iterator it = mapBar.find("name");

if ( mapBar.end() != it )
{
    return it->second;
}

在我返回它之前 - >第二,我想将该项目的内容转储到cout.尝试这样做时,我迷失了迭代器.非常感谢您提供一些帮助或提示.

在 Rails 中，当我需要时：

/comments

和

/posts/1/comments

我如何最好地组织 CommentsController？例如让路由共享索引操作，还是使用 2 个控制器？

我正在尝试使用Chef-solo为RVM设置一本食谱.

我的run_list看起来像:

  "run_list": [
    "recipe[apt]",
    "recipe[build-essential]",
    "recipe[curl]",
    "recipe[users]",
    "recipe[rvm::vagrant]",
    "recipe[rvm::system]",
    "recipe[nginx::passenger]",
    "recipe[nginx::source]",
    "recipe[postgresql::server]",
    "recipe[postgresql::client]"
  ]

我对RVM和Nginx的属性:

  "rvm": {
    "rubies": ["1.9.3-p0"],
    "global": ["1.9.3-p0"],
    "vagrant": { "system_chef_solo" : "/opt/ruby/bin/chef-solo" },
    "gems": {
      "1.9.3-p0": [
        {"name": "bundler"},
        {"name": "passenger"},
        {"name": "rake"}
      ]
    }
  },

  "nginx": {
    "version": "1.2.5",
    "user": "deploy",
    "init_style": "init",
    "modules": [
      "http_stub_status_module",
      "http_ssl_module",
      "http_gzip_static_module"
    ],
    "passenger": {
      "version": "3.0.18"
    },
    "configure_flags": [
      "--add-module=/var/lib/gems/1.9.1/gems/passenger-3.0.18/ext/nginx"
    ],
    "gzip_types": [
      "text/plain",
      "text/html",
      "text/css",
      "text/xml",
      "text/javascript",
      "application/json",
      "application/x-javascript",
      "application/xml",
      "application/xml+rss"
    ]
  },

但是,转换中断了:

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