irb(main):001:0> a = Article.first
 ~ SELECT "id", "user_id", "category_id", "name", "counter", "yes_count", "no_count", "vote_count", "created_at", "updated_at", "avatar_file_name", "avatar_content_type", "avatar_file_size", "avatar_updated_at", "tag_id" FROM "articles" ORDER BY "id" LIMIT 1
=> #<Article id=1 user_id=1 category_id=1 name="wreerqwrwewqer" content=<not loaded> counter=0 yes_count=0 no_count=0 vote_count=0 created_at=#<DateTime: 23565888871/9600,1/12,2299161> updated_at=#<DateTime: 23565888871/9600,1/12,2299161> avatar_file_name=nil avatar_content_type=nil avatar_file_size=nil avatar_updated_at=nil tag_id=nil>
irb(main):002:0> a.update_rating(1, 0)
 ~ SELECT "content", "id", "user_id", "category_id", "name", "counter", "yes_count", "no_count", "vote_count", "created_at", "updated_at", "avatar_file_name", "avatar_content_type", "avatar_file_size", "avatar_updated_at", "tag_id" FROM "articles" WHERE ("id" = 1) ORDER BY "id"
=> true
irb(main):003:0> a.update_rating(1, 0)
 ~ UPDATE "articles" SET "updated_at" = '2008-11-09T16:10:58+02:00', "vote_count" = 1, "yes_count" = 1 WHERE ("id" = 1)
=> true

class Article
  include DataMapper::Resource
  include Paperclip::Resource
  include DataMapper::Validate
  include DataMapper::Timestamp

  property :id, Integer, :serial => true
  property :user_id, Integer
  property :category_id, Integer
  property :name, String, :nullable => false, :length => 200
  property :content, DM::Text
  property :counter, Integer, :default => 0
  property :yes_count, Integer, :default => 0
  property :no_count, Integer, :default => 0
  property :vote_count, Integer, :default => 0
  property :created_at, DateTime
  property :updated_at, DateTime

  belongs_to :category
  has n, :tag
  has n, :comments
  has n, :article_comments
  belongs_to :user

  validates_present :name
  validates_present :category_id
  validates_present :user_id
  validates_present :content

  has_attached_file :avatar,
    :styles => { :small => "60x60#", :medium => "100x100>", :large => "200x200>" },
    :whiny_thumbnails => true

  validates_attachment_thumbnails :avatar

  def update_rating(yes, no)
  self.yes_count += yes
  self.no_count += no
  self.vote_count = self.no_count + self.yes_count
  self.dirty?
  end

  def update_counter
    self.counter += 1
    self.save
  end


end