rsslldnphy

## Model code

class Customer < ActiveRecord::Base

  def find_by_name(name)
    Option[where(name: name).first]
  end
end

## Controller code

rsslldnphy

"Nils - what are your Options?" - Russell Dunphy

Tony Hoare, inventor of the null reference, calls it his "billion dollar mistake".
Although Ruby goes some way to correcting it by making `nil` at least be a class
with some reasonably helpful stuff on it, you'll no doubt have been hit by a
`NoMethodError: undefined method 'foo'` just as many times as me.

So, given this problem exists, I want to convince you of a few things.

First, that there are not one, but two types of `nil`.

rsslldnphy

(defun restart-sml ()
  (sml-prog-proc-switch-to)
  (end-of-buffer)
  (comint-delchar-or-maybe-eof 0))

(defun run-sml-tests-now ()
  (let* ((code-file-name
           (replace-regexp-in-string "_tests" "" (buffer-file-name)))
	 (test-file-name
	   (replace-regexp-in-string "\.sml" "_tests.sml" code-file-name)))

rsslldnphy

require 'rspec'

class Object

  def peg(&block)
    block.call(self)
  end

  def wend(arg)
    Wender.new(self, arg)