notify ..

gistfile1.rb

 before_save :set_material_should_change_field
 after_save :change_material_attributes
 
 
  def set_material_should_change_field
      option_changed_attributes = self.changed_attributes
      @change_field = {}
      if self.new_record?
        @change_field.merge!( { :price => true, :lead_time => true } )
      elsif option_changed_attributes.include?('price_min') || option_changed_attributes.include?('price_max')
        @change_field.merge!( { :price => true })
      elsif option_changed_attributes.include?('min_lead_time') || option_changed_attributes.include?('max_lead_time')
        @change_field.merge!({ :lead_time => true })
      end
      @change_field
  end

   def change_material_attributes
      return if @change_field.empty?
      material = self.material
      material_options = material.material_options
      if @change_field[:price]
        price_min = material_options.minimum(:price_min)
        price_max  = material_options.maximum(:price_max)
        material.price_range = self.price_range
      elsif @change_field[:lead_time]
        min_lead_time = material_options.minimum(:min_lead_time)
        max_lead_time = material_options.maximum(:max_lead_time)
        material.lead_time_range = self.lead_time_range
      end
      material.save!
   end