ruby-on-rails – 从ruby中的嵌套哈希数组中搜索键值

发布时间：2020-12-17 03:49:29 所属栏目：百科来源：网络整理

导读：我有嵌套哈希数组, @a = [{"id"="5","head_id"=nil,"children"= [{"id"="19","head_id"="5","children"= [{"id"="21","head_id"="19","children"=[]}]},{"id"="20","children"= [{"id"="22","head_id"="20","children"=[]},{"id"="23"}] }] }] 我需要所有具

我有嵌套哈希数组,

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

我需要所有具有键名称’id’的值的数组.像@b = [5,19,21,20,22,23]
我已经试过这个’@a.find {| h | H [ ‘ID’]}`.
有谁知道如何得到这个？

谢谢.

解决方法

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

使用这种方法就像

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

（编辑：李大同）

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