gistfile1.rb

  def forfeited_amount
    sum = 0
    all_grants.each do |grant|
      sum += grant.forfeitures.between(from_date, to_date).sum(:amount)
    end
    sum
  end

  def second_forfeited_amount
    all_grants.joins(:forfeitures)
      .where("option_grant_actions.created_at > ? AND option_grant_actions.created_at < ?", from_date.beginning_of_day, to_date.end_of_day)
      .select("option_grants.*, option_grant_actions.created_at AS forfeiture_created_at,"\
        "option_grant_actions.amount AS forfeited_amount")
      .map{ |it| it.forfeited_amount.to_i }.sum
  end