Ruby on Rails

Hi,
I am using Carrierwave in my Rails 3.x app along with Fog to store
images on S3. I am trying to prevent uploading of duplicate images. I
am a novice programmer and would appreciate any suggestions.

This is my approach:

1. Upload file using carrierwave.
class ImageUploader < CarrierWave::Uploader::Base
include CarrierWave::MiniMagick
storage :fog
include CarrierWave::MimeTypes
process :set_content_type
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end

2. In picture model:
require 'digest/sha1'
before_validation :update_sha_1_hash
private
def update_sha_1_hash
self.sha_1_hash = Digest::SHA1.hexdigest(self.image)
end

3.Check If the hash identifier in #2 is a duplicate of an existing
upload
validates_uniqueness_of :sha_1_hash

Here's the error: can't convert ImageUploader into String
I am not sure how to direct SHA1 to the actual image file before it is
uploaded..

Thanks,
Dave

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