Object comparison vs. id

object-vs-id-comparison.rb

Benchmark.ips do |x|
  x.report('object comparison') { item.user    == print.user    }
  x.report('id comparison')     { item.user_id == print.user_id }
  x.compare!
end

Calculating -------------------------------------
    object comparison 1.204k i/100ms
    id comparison     1.972k i/100ms
-------------------------------------------------
    object comparison     43.855k (±18.9%) i/s -    209.496k
        id comparison      1.077M (±21.8%) i/s -      4.727M

Comparison:
       id comparison:  1076589.8 i/s
   object comparison:    43854.6 i/s - 24.55x slower