ruby-on-rails - 从 ruby​​ 中的嵌套哈希数组中搜索键值

Question

我有嵌套哈希数组，即

@a = [{"id"=>"5", "head_id"=>nil,
         "children"=>
             [{"id"=>"19", "head_id"=>"5",
                 "children"=>
                     [{"id"=>"21", "head_id"=>"19", "children"=>[]}]},
             {"id"=>"20", "head_id"=>"5",
                 "children"=>
                     [{"id"=>"22", "head_id"=>"20", "children"=>[]}, {"id"=>"23"}]
             }]
     }]

我需要具有键名“id”的所有值的数组。像@b = [5,19,21,20,22,23]我已经尝试过这个 '@a.find { |h| h['id']}`。有谁知道如何得到这个？

谢谢。

Answer 1

您可以为 Array 类对象创建新方法。

class Array
  def find_recursive_with arg, options = {}
    map do |e|
      first = e[arg]
      unless e[options[:nested]].blank?
        others = e[options[:nested]].find_recursive_with(arg, :nested => options[:nested])
      end
      [first] + (others || [])
    end.flatten.compact
  end
end

使用这个方法会像

@a.find_recursive_with "id", :nested => "children"