## Recipe model (./app/models/recipe.rb)
class Recipe < ActiveRecord::Base
  attr_accessor :ingredients_text
  has_many :ingredients

  after_save :parse_ingredients

protected

  def parse_ingredients
    ingredients = @ingredients_text.split("\n").map do |ingredient|
      Ingredient.find_or_create_by_name_and_recipe_id(ingredient.strip, id)
    end
    @ingredients_text = nil
  end
end

## Recipe Spec (./spec/models/recipe_spec.rb)
require File.dirname(__FILE__) + "/../spec_helper"

context "A new Recipe" do
  setup do
    @recipe = Recipe.new do |r|
      r.name = "Testing recipe"
      r.time = "5 minutes"
      r.appliance = "any"
      r.instructions = "Mix all and serve"
      r.ingredients_text = "1 tomato
	2 bananas
	3 eggs"
    end
  end

  specify "should have no ingredients before saving" do
    @recipe.ingredients.should_be_empty
  end

  specify "should have ingredients after saving" do
    @recipe.save
    @recipe.ingredients.should_not_be_empty
  end

  specify "should not have the ingredients in text form after saving" do
    @recipe.save
    @recipe.ingredients_text.should_be_nil
  end
end

context "A saved recipe" do
  fixtures :recipes, :ingredients

  specify "should load the recipe text on demand" do
  end
end

## `rake spec:models` output [plaintext]
(in /var/www/recetarium)
Ferret is not available on this system
/usr/bin/ruby18 -I"/usr/lib/ruby/gems/1.8/gems/rspec-0.7.3/lib" "/usr/lib/ruby/gems/1.8/gems/rspec-0.7.3/bin/spec" "spec/models/recipe_spec.rb"

Ferret is not available on this system

...F

1)
TypeError in 'A saved recipe should load the recipe text on demand'
can't convert nil into String


Finished in 0.140132 seconds

4 specifications, 1 failure
rake aborted!
Command failed with status (1): [/usr/bin/ruby18 -I"/usr/lib/ruby/gems/1.8/...]

(See full trace by running task with --trace)

shell returned 1