gistfile1.txt

  def build_payable_by_attributes
    # Automatically build payable_by - in javascript we'll give the user control to change these on ContractIspsController#new
    payable_by.eql?("shared") ? count = 3 : count = 1
    remove_older_payment_amounts
    
    count.times do 
      payable_amounts.build(:amount => 0) if payable_amounts.size != count
    end
  end
  
  def remove_older_payment_amounts
    payable_amounts.each { |p| p.destroy }
  end