Question

我仍然是Puppet的初学者。所以，请忍受我。假设我通过某个模块在Puppet中创建了此哈希

@media screen and (max-width: 480px) {
   .tile-post > :first-child
   {
      position:relative;
   }
}

如何找到哈希中特定键和值对的键？在这种情况下，例如，我想查找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 } }拥有的所有密钥。因此，预期结果将类似于： john

预先感谢

Answer 1

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

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

Answer 2

该问题询问如何在Puppet中执行此操作，但令人困惑的是，哈希是Ruby哈希，并且该问题还具有Ruby标签。

无论如何，这是您在Puppet中执行的操作：

$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)

应用人偶导致：

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

Answer 3

使用Enumerable#each_with_object的另一个选项：

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

将键和值设置为String。

查找密钥在Puppet Hash中包含特定的密钥值对

3 个答案: