generate a different random number (#5882)

frameworks/Ruby/rails/app/controllers/hello_world_controller.rb

@@ -37,12 +37,15 @@ class HelloWorldController < ApplicationController
     queries = 1 if queries < 1
     queries = 500 if queries > 500
 
-    numbers = (1..10000).to_a.sample(queries)
+    numbers = (1..10000).to_a.sample(queries).sort
     worlds = numbers.map do |id|
       # get a random row from the database, which we know has 10000
       # rows with ids 1 - 10000
       world = World.select(:id, :randomNumber).find(id)
-      world.update_attribute(:randomNumber, Random.rand(1..10000))
+      begin
+        rn = Random.rand(1..10000)
+      end while rn == world.randomNumber
+      world.update_attribute(:randomNumber, rn)
       world
     end