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