我还是Puppet的初学者。所以请耐心等待。让我们假设我通过一些模块在Puppet中创建了这个哈希
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
}
}
如何在哈希中找到特定键和值对的键?在这种情况下,例如我想找到john
拥有的所有密钥。所以预期的结果将是:[user@desktop1, user@desktop3]
提前致谢
这个问题询问如何在Puppet中执行此操作,但令人困惑的是,Hash是一个Ruby Hash,而且问题也有一个Ruby标记。
无论如何,这就是你在Puppet中的表现:
$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)
傀儡应用导致:
Notice: Scope(Class[main]): [user@desktop1, user@desktop3]
https://ruby-doc.org/core-2.5.1/Hash.html#method-i-select
account.select {|key, value| value['owner'] == 'john'}.keys
使用Enumerable#each_with_object
的另一个选择:
account.each_with_object([]) { |(k, v), a| a << k if v['owner'] == 'john'}
#=> ["user@desktop1", "user@desktop3"]
假设键和值为String
。