技術診断

診断終了まで残り8問

このコードの改善点は何だと思う？

class KlassController < ApplicationController
  def make_group
    classmates = Student.where(klass_id: current_klass.id)
    while classmates.count >= 5
      chosen_students = classmates.sample(5)
      group = Group.new(klass_id: current_klass.id)

      chosen_students.each do |student|
      group.members << student
      end

      classmates - chosen_students
    end
  end
end