# I'm not sure if there's a better way to do this, but it works...<\/span>\n\n# The tests look like:<\/span>\n\n  test<\/span> "deals with dupe slugs automatically"<\/span> do<\/span>\n    v1<\/span> =<\/span> Video<\/span>.<\/span>make<\/span>(<\/span>:name<\/span> =><\/span> "Nick Vegas"<\/span>)<\/span>\n    v2<\/span> =<\/span> Video<\/span>.<\/span>make<\/span>(<\/span>:name<\/span> =><\/span> "Nick Vegas"<\/span>)<\/span>\n    v3<\/span> =<\/span> Video<\/span>.<\/span>make<\/span>(<\/span>:name<\/span> =><\/span> "Nick Vegas"<\/span>)<\/span>\n    assert_equal<\/span> "nickvegas"<\/span>,<\/span> v1<\/span>.<\/span>slug<\/span>\n    assert_equal<\/span> "nickvegas2"<\/span>,<\/span> v2<\/span>.<\/span>slug<\/span>\n    assert_equal<\/span> "nickvegas3"<\/span>,<\/span> v3<\/span>.<\/span>slug<\/span>\n  end<\/span>\n\n# The model and relevant code looks like:<\/span>\n\nclass<\/span> Video<\/span> <<\/span> ActiveRecord<\/span>::<\/span>Base<\/span>\n  before_validation<\/span> :generate_slug<\/span>\n  validates_presence_of<\/span> :slug<\/span>\n  validates_uniqueness_of<\/span> :slug<\/span>\n  \n  def<\/span> generate_slug<\/span>\n    slug<\/span> =<\/span> name<\/span>.<\/span>parameterize<\/span>.<\/span>gsub<\/span>(<\/span>'-'<\/span>,<\/span> ''<\/span>)<\/span>\n    if<\/span> Video<\/span>.<\/span>find_by_slug<\/span>(<\/span>slug<\/span>)<\/span>\n      counter<\/span> =<\/span> 2<\/span>\n      until<\/span> Video<\/span>.<\/span>find_by_slug<\/span>(<\/span>"<\/span>#{<\/span>slug<\/span>}#{<\/span>counter<\/span>}<\/span>"<\/span>)<\/span>.<\/span>nil?<\/span>\n        counter<\/span> +=<\/span> 1<\/span>\n      end<\/span>\n      slug<\/span> =<\/span> "<\/span>#{<\/span>slug<\/span>}#{<\/span>counter<\/span>}<\/span>"<\/span>\n    end<\/span>\n    self<\/span>.<\/span>slug<\/span> =<\/span> slug<\/span>\n  rescue<\/span>\n    # use validations to catch errors<\/span>\n  end<\/span>   \nend<\/span>\n<\/pre><\/div>\n