ruby - 合并数组中的哈希 [ruby]

Question

我有哈希数组

[{:id=>2, :price_psm=>450, :rooms_count=>3, :sq=>50, :tax_inc=>"t", :title=>"title1"},
 {:id=>2, :price_psm=>499, :rooms_count=>3, :sq=>40, :tax_inc=>"t", :title=>"title1"}, 
 {:id=>2, :price_psm=>499, :rooms_count=>3, :sq=>41, :tax_inc=>"t", :title=>"title1"}, 
 {:id=>1, :price_psm=>450, :rooms_count=>2, :sq=>20, :tax_inc=>"t", :title=>"title2"}] 

我如何合并相同的散列并创建这样的东西:

[{:id=>2, :price_psm=>[450,499,499], :rooms_count=>3, :sq=>[50,40,41], :tax_inc=>"t", :title=>"title1"}, 
 {:id=>1,  :price_psm=>450, :rooms_count=>2, :sq=>20, :tax_inc=>"t", :title=>"title2"}] 

Answer 1

类似于:

require 'pp'

INPUT = [{:id=>2, :price_psm=>450, :rooms_count=>3, :sq=>50, :tax_inc=>"t", :title=>"title1"},
        {:id=>2, :price_psm=>499, :rooms_count=>3, :sq=>40, :tax_inc=>"t", :title=>"title1"}, 
        {:id=>2, :price_psm=>499, :rooms_count=>3, :sq=>41, :tax_inc=>"t", :title=>"title1"}, 
        {:id=>1, :price_psm=>450, :rooms_count=>2, :sq=>20, :tax_inc=>"t", :title=>"title2"}] 



RES = INPUT.group_by {|row| row[:id] }.collect do |k,v|
  keys = v.collect {|rec| rec.keys}.flatten.uniq
  group = {}
  keys.each do |key|
    vals = v.collect { |rec| rec[key] }.uniq.compact
    group[key] = vals.size > 1 ? vals : vals.first
  end
  group
end

pp RES