convert_oid.rb

## Converts ObjectIds to Strings in a mongodb json dump. Can use this to convert for use in mongoid
require 'json'

def convert_id(item)
  if id = item['_id']['$oid']
    item['_id'] = id
  end
end


$stdin.each_line do |line|
  json = JSON.parse(line)

  
  convert_id(json)
  old = json['old']
  if old.kind_of? Array
    json['old'].each do |o|
      convert_id(o)
    end
  end

  puts json.to_json
end