perryqh

module DelayedJobExtensions
  def delay_email_methods(*delay_me)
    klass = (class << self; self end)
    delay_me.each do |attr|
       klass.send(:define_method, "delay_#{attr.to_s}".to_sym) do |*args|
        if defined?(DISABLE_DELAYED_JOB) && DISABLE_DELAYED_JOB
          self.send("deliver_#{attr.to_s}".to_sym, *args)
         else
          self.delay.send("deliver_#{attr.to_s}".to_sym, *args)
        end

perryqh

Emailer.delay_invite_customer('[email protected]')

perryqh

class Emailer < ActionMailer::Base
  helper :application
  layout 'email'
  extend DelayedJobExtensions

  delay_email_methods :invite_customer

  def invite_customer(cutomer_email)
    recipients customer_email
    from admin_email

perryqh

module DelayedJobExtensions
  def delay_email_methods(*delay_me)
    klass = (class << self; self end)
    delay_me.each do |attr|
       klass.send(:define_method, "delay_#{attr.to_s}".to_sym) do |*args|
        if USE_DELAYED_JOB
          self.delay.send("deliver_#{attr.to_s}".to_sym, *args)
         else
          self.send("deliver_#{attr.to_s}".to_sym, *args)
        end

perryqh

context "with valid MortgageUtil" do
  before(:all) do
    @mortgage_util = MortgageUtil.new(100000, 6.0, 360, 1200, 1.25)
  end
  it "should have proper monthly interest rate" do
    @mortgage_util.send(:monthly_interst_rate).should == 0.005
  end
  it "should have proper monthly payment" do
    @mortgage_util.monthly_payment.should be_close(599.55, 0.001)
  end

perryqh

def assert_monthly_apr_payment_matches(loan_amount, rate, period, fee, points)
  mortgage_util = MortgageUtil.new(loan_amount, rate, period, fee, points)
  monthly_payment_with_fees = mortgage_util.monthly_payment_with_fees
  monthly_payment_from_apr = MortgageUtil.new(loan_amount, mortgage_util.apr, period, 0, 0).monthly_payment
  monthly_payment_with_fees.should be_close(monthly_payment_from_apr, 0.01)
end

it "should calculate original monthly payment from APR" do
  assert_monthly_apr_payment_matches(300000, 6.5, 360, 1200, 1.25)
  assert_monthly_apr_payment_matches(300000, 6.5, 360, 0, 0)

perryqh

loan_amount = 350000
=> 350000
interest_rate = 4.75
=> 4.75
period = 30 * 12
=> 360
lender_fee = 800
=> 800
points = 1.0
=> 1.0

perryqh

def newton_raphson(f, f_deriv, start, precision = 5)
      k_plus_one = start
      k = 0.0

      while ((k - 1) * 10**precision).to_f.floor !=  ((k_plus_one - 1) * 10**precision).to_f.floor
        k = k_plus_one
        k_plus_one = k - f.call(k) / f_deriv.call(k)
      end
      k_plus_one
end

perryqh

$ sudo gem install gemcutter
$ gem tumble
$ sudo gem install pwfoo

perryqh

# = srand_seed_generator.rb - Random seed generator uses the system time and currently running processes to generate a highly random seed.
#
# Perry Hertler mailto:[email protected]
#
# == Example
#
# my_seed = PwFoo::SrandSeedGenerator.new.get_next_seed
module PwFoo
  require 'digest/md5'