socialforge/app/models/statistic.rb

class Statistic < ActiveRecord::Base
  attr_accessible :description, :name, :status, :user_id, :main_category_id, :sub_category_id, :file_size
  acts_as_attachable

  validates_presence_of :main_category_id

  def creator
    User.find self.user_id
  end

  def main_category
    MainCategory.find self.main_category_id
  end

  def sub_category
    SubCategory.where(:id => sub_category_id).first
  end
end