Does not set to true even if question count is more than progress

gistfile1.rb

class Tracker < ActiveRecord::Base
  attr_accessible :survey_id, :respondent_id, :progress, :completed
  belongs_to :survey
  after_save :set_completed?


  #set tracker.completed to true if all questions are answered
  def set_completed?
    if progress >= survey.questions.count
      completed = true
    end
  end
  
end

#Does not set to true even if question count is more than progress