Ruby根据一个散列值将散列组合到一个数组中 [英] Ruby combining hashes in an array based on one hash value

问题描述

  [
 {id=> 1 ，name=>蝙蝠侠，net_worth=> 100，vehicles=> 2}，
 {id= 1， ，net_worth=> 100，车辆=> 2}，
 {id= 2，name=>超人，net_worth=>车辆=> 2}，
 {id=> 3，name=>Wonderwoman，net_worth=> 100，vehicles=> 2} b] 
  

我想在保留它的同时基于id值组合散列，保留名称，并将net_worth和车辆值相加。

所以最终的数组将如下所示：

  [
 {id=> 1，name=>蝙蝠侠，net_worth=> 200，车辆=> 4}，
id = 2name=>超人，net_worth=> 100，vehicles=> 2}，
 {id= 3， name=>Wonderwoman，net_worth=> 100，vehicles=> 2} 
] 
  

解决方案

这里是解决方案你的问题的离子。正如你所看到的，你应该通过id和name对行进行分组，然后计算其他值的总和并生成结果：

  rows = [ 
 {id=> 1，name=>蝙蝠侠，net_worth=> 100，vehicles=> 2}，
 {id=> ; 1，name=>蝙蝠侠，net_worth=> 100，vehicles=> 2}，
 {id=> 2，name=>超人，net_worth=> 100，车辆=> 2}，
 {id= 3，name=>Wonderwoman，net_worth=> 100 ，车辆=> 2} 
] 
 
 groups = rows.group_by {| row | [row ['id']，row ['name']]} 
 
 result = groups.map do | key，values | 
 id，name = * key 
 
 total_net_worth = values.reduce（0）{| sum，value | sum + value ['net_worth']} 
 total_vehicles = values.reduce（0）{| sum，value | sum + value ['vehicles']} 
 
 {id=> id，name=>名称，net_worth=> total_net_worth，车辆=> total_vehicles} 
结束
 
结果
  

I have an array of hashes that looks like:

[
  {"id"=>1, "name"=>"Batman", "net_worth"=>100, "vehicles"=>2},
  {"id"=>1, "name"=>"Batman", "net_worth"=>100, "vehicles"=>2},
  {"id"=>2, "name"=>"Superman", "net_worth"=>100, "vehicles"=>2},
  {"id"=>3, "name"=>"Wonderwoman", "net_worth"=>100, "vehicles"=>2}
]

I'd like to combine hashes based on the id value while preserving it, preserve the name, and sum the net_worth and vehicles values.

So the final array would look like:

[
  {"id"=>1, "name"=>"Batman", "net_worth"=>200, "vehicles"=>4},
  {"id"=>2, "name"=>"Superman", "net_worth"=>100, "vehicles"=>2},
  {"id"=>3, "name"=>"Wonderwoman", "net_worth"=>100, "vehicles"=>2}
]

解决方案

Here is solution of your problem. As you can see you should group rows by id and name, then calculate sum of other values and build result:

rows = [
    {"id"=>1, "name"=>"Batman", "net_worth"=>100, "vehicles"=>2},
    {"id"=>1, "name"=>"Batman", "net_worth"=>100, "vehicles"=>2},
    {"id"=>2, "name"=>"Superman", "net_worth"=>100, "vehicles"=>2},
    {"id"=>3, "name"=>"Wonderwoman", "net_worth"=>100, "vehicles"=>2}
]

groups = rows.group_by {|row| [row['id'], row['name']] }

result = groups.map do |key, values|
  id, name = *key

  total_net_worth = values.reduce(0) {|sum, value| sum + value['net_worth'] }
  total_vehicles = values.reduce(0) {|sum, value| sum + value['vehicles'] }

  { "id" => id, "name" => name, "net_worth" => total_net_worth, "vehicles" => total_vehicles }
end

p result

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