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[英]How to merge hashes with different key/value pairs in array of hashes? Ruby
[英]Merge an array of hashes that have the same key but different value and add the value
您好,我有一个与此类似的哈希
@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"}]
我如何使它看起来像这样?:
@receivers
=> [{:amount=>150, :email=>"user_02@example.com"}
{:amount=>200, :email=>"user_01@example.com"}]
谢谢您的帮助。
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"}]
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