合並具有相同鍵但值不同的哈希數組並添加值

Question

您好，我有一個與此類似的哈希

@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"}]

我如何使它看起來像這樣？：

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

謝謝您的幫助。

Answer 1

您可以這樣計算：

@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"}]