Rails - Apr 2006 - Model with file uploads

I''m working on a model for a videos table that include the video info 
(title, description) and a couple of uploads (video file, thumb image)
I was going to use the file_column plugin but I dont like the idea of 
storing the file names in the database when I dont need to, plus I dont 
think it is very flexible.

Here''s what I done. What do you think of this? Any suggestions?

class Video < ActiveRecord::Base
  acts_as_taggable

  attr_accessor :field_tags
  attr_accessor :field_thumb
  attr_accessor :field_video

  validates_presence_of :title
  validates_presence_of :description
  validates_presence_of :field_tags

  def validate_on_create
    errors.add ''field_thumb'', ''Invalid
thumb'' unless
!self.field_thumb.read.empty?
    errors.add ''field_video'', ''Invalid
video'' unless
!self.field_video.read.empty?
  end

  def after_create
    self.tag_with self.all_tags

    # upload field_video and upload field_thumb
  end

  def after_update
    self.tag_with self.all_tags
  end

  def after_delete
    # delete video and thumb files
  end

  def tags
    # return formatted tags from tag_list
  end

  def thumb
    # return full thumb url
  end

  def video
    # return full video url
  end
end

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