Kindle Clippings to MongoDB

import_clippings.rb

require 'rubygems'
require 'kindleclippings'
require 'mongo'
require 'digest/md5'

parser = KindleClippings::Parser.new
clippings = parser.parse_file('./My Clippings.txt')

connection = Mongo::Connection.new("localhost")
db = connection.db("kindle")

coll = db.collection("clippings")

clippings.each do |clipping|
    hash = {}
    clipping.instance_variables.each do |var| 
        hash[var.to_s.delete("@")] = clipping.instance_variable_get(var).to_s
        hash['checksum'] = Digest::MD5.hexdigest( clipping.book_title.to_s + clipping.content.to_s )
    end
    coll.insert( hash) unless coll.find_one({ :checksum => hash['checksum'] } )
end

Now with collision detection