CODEWITHSUNDEEP
ruby
Craig Ward
Craig Ward

Reputation: 2485

Accessing a Ruby hash with a variable as the key

If I had the following ruby hash:

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

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/"

Upvotes: 13

Views: 12843

Answers (2)

Darshan Rivka Whittle
Darshan Rivka Whittle

Reputation: 34031

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/")

Upvotes: 8

tckmn
tckmn

Reputation: 59273

You would use brackets:

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

Upvotes: 5

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