通过一些键和其他键的和值来合并散列数组

Question

我有一个像这样的数组

array = [
  {"point"=>6, "score"=>4, "team"=>"Challenger"},
  {"point"=>4, "score"=>2, "team"=>"INB"},
  {"point"=>2, "score"=>2, "team"=>"Super-11"},
  {"point"=>3, "score"=>7, "team"=>"INB"}
]

我想通过"team“合并散列，并将"point”和"score“的值相加。另外，如果point大于5，我还想在每个哈希中插入一个键"qualified“。因此，最终结果将是：

result= [
      {"point"=>6, "score"=>4, "qualified"=> "yes", "team"=>"Challenger"},
      {"point"=>7, "score"=>9, "qualified"=> "yes", "team"=>"INB"},
      {"point"=>2, "score"=>2, "qualified"=> "no", "team"=>"Super-11"}
    ]

任何帮助都将不胜感激。谢谢!

Answer 1

另一种可能的解决方案:)

array.group_by { |item| item['team'] }.map do |_, items| 
  result = items.inject({}) { |hash, item| hash.merge(item) { |_, old, new| Integer(old) + new rescue old } }
  result.merge("qualified" => result['point'] > 5 ? "yes" : "no")
end

Answer 2

result = array.group_by{|i| i['team']}
               .map do |k,v|
                 points = v.map{|i| i['point']}.inject(0, :+)
                 score = v.map{|i| i['score']}.inject(0, :+)
                 {
                   'point' => points, 
                   'score' => score, 
                   'qualified' => points > 5 ? 'yes' : 'no',
                   'team' => k
                 }
               end

Answer 3

结合使用group_by和map应该会有所帮助

result = 
    array.group_by {|item| item['team'] }
         .map do |team, items|
             total_points = items.map{|item| item['point']}.reduce(0, :+)
             total_score = items.map{|item| item['score']}.reduce(0, :+)
             qualified = points > 5
             {
                 'point' => total_points, 
                 'score' => total_score, 
                 'qualified' => qualified ,
                 'team' => team
             }
          end