app/models/speach_balloon_template.rb

   1 class SpeachBalloonTemplate < ActiveRecord::Base
   2   has_many :balloon_templates, :dependent => :destroy
   3   has_many :speach_templates, :dependent => :destroy
   4   accepts_nested_attributes_for :balloon_templates
   5   accepts_nested_attributes_for :speach_templates
   6   before_create :supply_t
   7
   8   def supply_t
   9     self.t = SpeachBalloon.maximum(:t).to_i + 1
  10   end
  11
  12 end