#/app/models/qna.rb
module Qna
  def self.table_name_prefix
    'qna_'
  end
end

#/app/models/qna/question.rb
class Qna::Question < ActiveRecord::Base
  belongs_to :category
  belongs_to :status, :class_name => Qna::Status
  belongs_to :char

  has_many :answers

  validates :head, :presence => true
  validates :text, :presence => true

end