我对此主题有类似的问题 Ruby on Rails - Hash of Arrays, group by and sum by column name
然而,我的问题是分组依据和多个列而不是一个。
例如:我的哈希
[
{"idx"=>"1234", "account"=>"abde", "money"=>"4.00", "money1"=>"1.00", "order"=>"00001", "order1"=>"1"},
{"idx"=>"1235", "account"=>"abde", "money"=>"2.00", "money1"=>"1.00", "order"=>"00001", "order1"=>"1"},
{"idx"=>"1235", "account"=>"abde", "money"=>"3.00", "money1"=>"1.00", "order"=>"00002", "order1"=>"2"}
]
结果如下
[
{"idx"=>"1234", "account"=>"abde", "money"=>"6.00", "money1"=>"2.00","order"=>"00001", "order1"=>"1"},
{"idx"=>"1234", "account"=>"abde", "money"=>"3.00", "money1"=>"1.00","order"=>"00002", "order1"=>"2"}
]
像这样的group_hashes arr, ["order","order1"], ["money","money1"]
我在合并中尝试了一个循环!但结果是错误的。 请教我解决这个案子。抱歉我的愚蠢思想。
答案 0 :(得分:0)
使用Enumerable#group_by
,您可以按order
,order1
键迭代哈希数组。
然后合并哈希(通过总结money
,money1
条目):
a = [
{"idx"=>"1234", "account"=>"abde", "money"=>"4.00", "money1"=>"1.00", "order"=>"00001", "order1"=>"1"},
{"idx"=>"1235", "account"=>"abde", "money"=>"2.00", "money1"=>"1.00", "order"=>"00001", "order1"=>"1"},
{"idx"=>"1235", "account"=>"abde", "money"=>"3.00", "money1"=>"1.00", "order"=>"00002", "order1"=>"2"}
]
a.group_by { |x| x.values_at('order', 'order1') }.map {|key, hashes|
result = hashes[0].clone
['money', 'money1'].each { |key|
result[key] = hashes.inject(0) { |s, x| s + x[key].to_f }
}
result
}
# => [{"idx"=>"1234", "account"=>"abde", "money"=>6.0, "money1"=>2.0, "order"=>"00001", "order1"=>"1"},
# {"idx"=>"1235", "account"=>"abde", "money"=>3.0, "money1"=>1.0, "order"=>"00002", "order1"=>"2"}]
group_keys = ['order', 'order1']
sum_keys = ['money', 'money1']
a.group_by { |x| x.values_at(*group_keys) }.map {|key, hashes|
result = hashes[0].clone
sum_keys.each { |key|
result[key] = hashes.inject(0) { |s, x| s + x[key].to_f }
}
result
}