Example of varying levels of abstraction

gistfile1.rb

def favorite post
  post.favorites.create!(user: current_user)

  if post.user.email_settings.email_favorites?
      UserMailer.favorite_email('Your post was favorited!',
                        "Good job! Your post was favorited.
                         #{link_to post_path(post), 'Have a look for yourself'}. \
                         Your friendly social networking team.").deliver
  end
end