pinrails/app/controllers/pages_controller.rb

class PagesController < ApplicationController
  def index
    @players = Player.all
  end

  def teampicker
    @groups = maketeams

    @machines = Machine.limit(@groups.size).order(Arel.sql("RANDOM()"))
  end

  private
    def maketeams
      r = Player.where("strikes < 4").order(Arel.sql("RANDOM()")).to_a

      groups = case r.size
        when 5
          [r.shift(3), r.shift(2)]
        when 6
          r.each_slice(3)
        when 9
          r.each_slice(3)
        when 10
          [r.shift(4), r.shift(3), r.shift(3)]
        when 13
          [r.shift(4), r.shift(3), r.shift(3), r.shift(3)]
        when 14
          [r.shift(4), r.shift(4), r.shift(3), r.shift(3)]
        else
          r.each_slice(4)
        end
    end
end