A nifty little Article model for Markdown file based articles

article.rb

# You need to set the Article.path to where your files are located.
# I do this in my application_controller.rb
Article.path = File.join(Rails.root, 'articles')

class Article
  attr_reader :title, :tags, :mtime, :slug, :filename
  
  def self.path=(path)
    @@path = path
  end

  def self.path
    @@path
  end
  
  def self.all
    @@articles = []
    Dir.glob(File.join(@@path, '**', '*.md')) do |file|
      filename = file.gsub(@@path + '/', '')
      path_parts = filename.split('/')
      @@articles.push(new({
        :filename => filename,
        :slug     => filename.gsub('.md', ''),
        :title    => path_parts.pop.gsub('.md', '').to_human_title,
        :tags     => path_parts,
        :mtime    => File::mtime(file)
      }))
    end
    @@articles
  end
  
  def self.find(slug)
    all.detect { |article| article.slug == slug } || raise(ActiveRecord::RecordNotFound)
  end
  
  def <=>(x)
    x.mtime <=> @mtime
  end
  
  def initialize(attributes)
    @title = attributes[:title]
    @slug = attributes[:slug]
    @tags = attributes[:tags]
    @mtime = attributes[:mtime]
    @filename = attributes[:filename]
  end
  
  def content
    file = File.join(@@path, @filename)
    if File.exists?(file)
      RDiscount.new(File.read(file)).to_html
    else
      nil
    end
  end
end