Accessing a Ruby hash with a variable as the key

Question

If I had the following ruby hash:

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

How wou

Answer 1

You would use brackets:

environments = {
   'testing' =>  '11.22.33.44',
   'production' => '55.66.77.88'
}
myString = 'testing'
environments[myString] # => '11.22.33.44'

Answer 2

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/")

Or, using the variable:

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

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/")