ruby - 展平散列并连接键

Question

我有这样一个哈希:

{
 "category" => ["sport", "gaming", "other"],
 "duration" => 312,
 "locations" => { 
    "688CQQ" => {"country" => "France", "state" => "Rhône-Alpes"},
    "aUZCAQ" => {"country" => "France", "state" => "Île de France"}
  }
}

如果值是散列，我想通过展平值将其减少为散列而不嵌套。在最终值中，我应该只有整数、字符串或数组，如下所示:

{
  "category" => ["sport", "gaming", "other"],
  "duration" => 312,
  "locations_688CQQ_country" => "France",
  "locations_688CQQ_state" => "Rhône-Alpes",
  "locations_aUZCAQ_country" => "France",
  "locations_aUZCAQ_state" => "Île de France"
}

我想要一个适用于任何嵌套级别的函数。我如何在 ruby​​ 中做到这一点？

Answer 1

改编自https://stackoverflow.com/a/9648515/311744

def flat_hash(h, f=nil, g={})
  return g.update({ f => h }) unless h.is_a? Hash
  h.each { |k, r| flat_hash(r, [f,k].compact.join('_'), g) }
  g
end