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PO
 

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    <p>Please see in detail, how to use securerandom ruby standard library to use UUID with example in rails 3.X and 4.X</p> <p>create usesguid.rb file in your lib/usesguid.rb and paste below code in that -</p> <pre><code>require 'securerandom' module ActiveRecord module Usesguid #:nodoc: def self.append_features(base) super base.extend(ClassMethods) end module ClassMethods def usesguid(options = {}) class_eval do self.primary_key = options[:column] if options[:column] after_initialize :create_id def create_id self.id ||= SecureRandom.uuid end end end end end end ActiveRecord::Base.class_eval do include ActiveRecord::Usesguid end </code></pre> <p>add following line in your config/application.rb to load file -</p> <pre><code>require File.dirname(__FILE__) + '/../lib/usesguid' </code></pre> <p>Create migration script for UUID function as mentioned below to -</p> <pre><code>class CreateUuidFunction &lt; ActiveRecord::Migration def self.up execute "create or replace function uuid() returns uuid as 'uuid-ossp', 'uuid_generate_v1' volatile strict language C;" end def self.down execute "drop function uuid();" end end </code></pre> <p>Here is example for contact migration, how we can use it -</p> <pre><code>class CreateContacts &lt; ActiveRecord::Migration def change create_table :contacts, id: false do |t| t.column :id, :uuid, null:false t.string :name t.string :mobile_no t.timestamps end end end </code></pre> <p>Final how to use into your model </p> <pre><code>class Contact &lt; ActiveRecord::Base usesguid end </code></pre> <p>This will help you to configure UUID for your rails application. </p> <p>This can be useful for Rails 3.0, 3.1, 3.2 and 4.0 as well.</p> <p>Please let me know If you have any issue while using it, so simple!</p> <p>Other options for Rails4 <a href="http://blog.lingohub.com/developers/2013/10/dev-bit-auto-generate-uuid-postgres-rails-4/" rel="nofollow">here</a></p>
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    1. POI need to generate uuid for my rails application. What are the options(gems) I have?
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    1. USRameshwar Vyevhare
    1. USRameshwar Vyevhare
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    1. COMy reason to use this in Rails 4, Actually I wanted to use earlier version of postgreSQL. If you have not such dependancy then can go for builtin feature.
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      1. USRameshwar Vyevhare
 

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