Experimental thoughts on the ruby way of doing parameters.

benchmark.rb

require 'benchmark'
require 'rack'
require 'json'

payload = {
  'user' => {
    'a' => '1', 'b' => '2',
    'comments' => [
      { 'body' => 'Hello' },
      { 'body' => 'World' }
    ]
  }
}

qs = Rack::Utils.build_nested_query(payload)
json = JSON.dump(payload)

N = 1000

Benchmark.bmbm do |x|
  x.report 'Rack::Utils.parse_nested_query' do
    N.times do
      Rack::Utils.parse_nested_query(qs)
    end
  end

  x.report 'Rack::Utils.parse_query' do
    N.times do
      Rack::Utils.parse_query(qs)
    end
  end

  x.report 'JSON.parse' do
    N.times do
      JSON.parse(json)
    end
  end
end

results.txt

Rehearsal ------------------------------------------------------------------
Rack::Utils.parse_nested_query   0.080000   0.010000   0.090000 (  0.077543)
Rack::Utils.parse_query          0.040000   0.000000   0.040000 (  0.042824)
JSON.parse                       0.020000   0.000000   0.020000 (  0.012559)
--------------------------------------------------------- total: 0.150000sec

                                     user     system      total        real
Rack::Utils.parse_nested_query   0.070000   0.000000   0.070000 (  0.076222)
Rack::Utils.parse_query          0.040000   0.000000   0.040000 (  0.039440)
JSON.parse                       0.010000   0.000000   0.010000 (  0.005851)