gistfile1.rb

class Article < ActiveRecord::Base
  belongs_to :author, :class_name => "User", :foreign_key => "user_id"
  validates_presence_of :title
  validates_presence_of :content
  has_foreign_language :title
  has_foreign_language :content
  validates_attachment_content_type :image, :content_type => [ 'image/jpeg', 'image/jpg', 'image/gif', 'image/png' ], :message => "не является изображением"
  
  has_attached_file :image, :path => ":rails_root/public/assets/:id/:style_:basename.:extension",
    :url => "/public/assets/:id/:style_:basename.:extension",
    :styles => {
    :standart => "300x300>",
    :medium => "200x200>"
  }
  
  validate :test_validator
  
  protected
  def test_validator
    if self.huipizda != true
      self.errors.add(:huipizda, 'assertion failed')
    end
  end
  
end