How to transform this array of hashes more elegantly?

transforming_array_of_hashes.rb

array = [{"no_in_series"=>116, "recipient_type"=>"individual", "subscriptions"=>3971},
 {"no_in_series"=>116, "recipient_type"=>"institution", "subscriptions"=>838},
 {"no_in_series"=>116, "recipient_type"=>"student", "subscriptions"=>509},
 {"no_in_series"=>115, "recipient_type"=>"individual", "subscriptions"=>3859},
 {"no_in_series"=>115, "recipient_type"=>"institution", "subscriptions"=>805},
 {"no_in_series"=>115, "recipient_type"=>"student", "subscriptions"=>441}]
 
array.group_by {|r| r["no_in_series"]}
  .map {|k,v| {k => v.map {|r| {r["recipient_type"] => r["subscriptions"]}}}}
  .map {|h| {h.keys.first => h.values.first.inject(&:merge)}}
# => [{116=>{"individual"=>3971, "institution"=>838, "student"=>509}}, {115=>{"individual"=>3859, "institution"=>805, "student"=>441}}]

array.each_with_object(Hash.new { |h, k| h[k] = Hash.new(0) }) do |item, counts|
  number, recipient, count = item.values_at('no_in_series', 'recipient_type', 'subscriptions')
  counts[number][recipient] += count
end
=> {116=>{"individual"=>3971, "institution"=>838, "student"=>509},
 115=>{"individual"=>3859, "institution"=>805, "student"=>441}}

array.group_by do |h|
  h['no_in_series']
end.transform_values do |value|
  value.to_h do |h|
    [h['recipient_type'], h['subscriptions']]
  end
end

Excellent! Thanks very much both. My brain was in meltdown yesterday while trying to figure this out.