使用变量作为键访问 Ruby 哈希

问题描述：

如果我有以下 ruby 哈希值:

If I had the following ruby hash:

environments = {
   'testing' =>  '11.22.33.44',
   'production' => '55.66.77.88'
}

我将如何访问上述散列的部分内容?下面是我想要实现的目标的示例.

How would I access parts of the above hash? An example below as to what I am trying to achieve.

current_environment = 'testing'
"rsync -ar root@#{environments[#{testing}]}:/htdocs/"

答

看起来您想要 exec 最后一行，因为它显然是一个 shell 命令而不是 Ruby 代码.你不需要插值两次；一次就可以:

It looks like you want to exec that last line, as it's obviously a shell command rather than Ruby code. You don't need to interpolate twice; once will do:

exec("rsync -ar root@#{environments['testing']}:/htdocs/")

或者，使用变量:

exec("rsync -ar root@#{environments[current_environment]}:/htdocs/")

请注意，更 Ruby 的方式是使用 Symbols 而不是 Strings 作为键:

Note that the more Ruby way is to use Symbols rather than Strings as the keys:

environments = {
   :testing =>  '11.22.33.44',
   :production => '55.66.77.88'
}

current_environment = :testing
exec("rsync -ar root@#{environments[current_environment]}:/htdocs/")

使用变量作为键访问 Ruby 哈希

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