Ruby on Rails

Hi all,

I am using rails 3.1 and ruby 1.9.3,Now i want to use uuid concept in
rails 3 for existing data

so i did like :-

create_table :posts, :id => false do |t|
  t.string :uuid, :limit => 36, :primary => true
end

ActiveRecord::Base.class_eval do

# old rails versions
set_primary_key 'uuid'

before_create :generate_uuid
def generate_uuid
self.id = UUIDTools::UUID.random_create.to_s
end
end


This is working for new data,now i want to migrate existing data with
relation.for uuid they are using datatype as string,in postgresql the
data type used for primary_key and foreign key is integer ,so if i am
trying to change foreign key integer to string it is throwing error.

Could you please tell me some example,how to do this.

kingston.s

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