[Puppet Users] Newbie question about fetching specific value of a key from hash

[Sam]

My hiera entries -

mysqlconfig::custom_mysql_options:
  mysqld:
    replicate-ignore-db: 'test'
    server-id: 12
    datadir: '/data/mysql_data'


I want to get the value of datadir in my puppet module. Please let me know 
what is the syntax I need to use to fetch this value. I tried something as 
follows but it doesn't work. 


$datadir = hiera('mysqlconfig::custom_mysql_options[datadir]')

  file { "$datadir":
    ensure => directory,
    owner  => 'mysql',
    group  => 'mysql',
    mode   => '0755',
  }


Thanks in advance
Sam

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