Markdown to HTML

article.rb

require 'markdown'

class Article < ActiveRecord::Base
  before_save do
    self.html = Markdown.new(content).to_html
  end
end

markdown.rb

class Markdown
  attr_reader :text

  def initialize(text)
    @text = text
  end

  def to_html
    markdown.render(text)
  end

private

  def markdown
    Redcarpet::Markdown.new HTMLWithPants.new(hard_wrap: true), {
      no_intra_emphasis: true,
      fenced_code_blocks: true,
      hard_wrap: true
    }
  end
end

class HTMLWithPants < Redcarpet::Render::HTML
  include Redcarpet::Render::SmartyPants
end