将数组的值与哈希值相加 [英] Sum the value of array in hash

问题描述

这是我的数组

[{:amount=>10, :gl_acct_id=>1, :alt_amount=>20}, {:amount=>20, :gl_acct_id=>2
, :alt_amount=>30}]

我想要结果

[{:amount => 30}] or {:amount = 30}

有什么想法吗?

推荐答案

您可以使用 inject 对所有金额求和.然后，如果需要，您可以将结果放回散列中.

You can use inject to sum all the amounts. You can then just put the result back into a hash if you need to.

arr = [{:amount=>10, :gl_acct_id=>1, :alt_amount=>20}, {:amount=>20, :gl_acct_id=>2, :alt_amount=>30}]    
amount = arr.inject(0) {|sum, hash| sum + hash[:amount]} #=> 30
{:amount => amount} #=> {:amount => 30}

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