拼合哈希並連接鍵

Question

我有這樣一個哈希：

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

我想將其降低到一個哈希沒有通過，如果該值是一個哈希壓扁的值嵌套。在最後的值，我應該只有整數，字符串或數組是這樣的：

{ 
    "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" 
} 

我想與任何級別的嵌套工作的功能。我怎樣才能做到這一點在紅寶石？

Answer 1

從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 

Answer 2

改編這裏是一個遞歸方法，其中h是你的哈希值。

def flat_hash(h) 
    h.reduce({}) do |a, (k,v)| 
    tmp = v.is_a?(Hash) ? flat_hash(v).map { |k2,v2| ["#{k}_#{k2}",v2]}.to_h : { k => v } 
    a.merge(tmp) 
    end 
end