CODEWITHSUNDEEP
puppet
AlamHo
AlamHo

Reputation: 193

Find key contain specific key value pair in Puppet Hash

I am still a beginner in Puppet. So please bear with me. Let's assume i have this hash created in Puppet through some module

account = {
  user@desktop1 => { 
      owner => john, 
      type => ssh-rsa, 
      public => SomePublicKey
  }, 
  user@desktop2 => {
    owner => mary, 
    type => ssh-rsa, 
    public => SomePublicKey
  }, 
  user@desktop3 => {
    owner => john, 
    type => ssh-rsa, 
    public => SomePublicKey
  }, 
  user@desktop4 => {
    owner => matt, 
    type => ssh-rsa, 
    public => SomePublicKey
  }
}

How can i find find the key for specific key and value pair inside the hash? which in this case just for example i want to find all the key owned by john. So the expected result would be something like: [user@desktop1, user@desktop3]

Thanks in advance

Upvotes: 0

Views: 2299

Answers (3)

Alex Harvey
Alex Harvey

Reputation: 15472

The question asks about how to do this in Puppet, although, confusingly, the Hash is a Ruby Hash and the question also has a Ruby tag.

Anyway, this is how you do it in Puppet:

$account = {
  'user@desktop1' => {
    'owner' => 'john',
    'type'  => 'ssh-rsa',
    'public' => 'SomePublicKey',
  },
  'user@desktop2' => {
    'owner' => 'mary',
    'type'  => 'ssh-rsa',
    'public' => 'SomePublicKey',
  },
  'user@desktop3' => {
    'owner' => 'john',
    'type'  => 'ssh-rsa',
    'public' => 'SomePublicKey',
  },
  'user@desktop4' => {
    'owner' => 'matt',
    'type'  => 'ssh-rsa',
    'public' => 'SomePublicKey',
  }
}

$users = $account.filter |$k, $v| { $v['owner'] == 'john' }.keys

notice($users)

Puppet applying that leads to:

Notice: Scope(Class[main]): [user@desktop1, user@desktop3]

Upvotes: 3

iGian
iGian

Reputation: 11193

Another option using Enumerable#each_with_object:

account.each_with_object([]) { |(k, v), a| a << k if v['owner'] == 'john'}
#=> ["user@desktop1", "user@desktop3"]

Supposing keys and values to be String.

Upvotes: 1

Raj
Raj

Reputation: 22926

https://ruby-doc.org/core-2.5.1/Hash.html#method-i-select

account.select {|key, value| value['owner'] == 'john'}.keys

Upvotes: 2

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