合并具有相同键但值不同的哈希数组并添加值

Question

你好我有一个类似于这个

的散列

@receivers
=> [{:amount=>50, :email=>"user_02@example.com"},
 {:amount=>50, :email=>"user_02@example.com"},
 {:amount=>50, :email=>"user_02@example.com"},
 {:amount=>100, :email=>"user_01@example.com"},
 {:amount=>100, :email=>"user_01@example.com"}]

我如何让它看起来像这样？：

@receivers
=> [{:amount=>150, :email=>"user_02@example.com"}
 {:amount=>200, :email=>"user_01@example.com"}]

感谢您的帮助。

Answer 1

您可以这样计算：

@receivers.group_by { |e| e[:email] }
          .map { |k, v| { amount: v.sum { |e| e[:amount] }, email: k } }



#=> [{:amount=>150, :email=>"user_02@example.com"},
#    {:amount=>200, :email=>"user_01@example.com"}]