attr_uuid

attr_uuid makes binary uuid attribute easy to use.

Installation

Add this line to your application's Gemfile:

gem 'attr_uuid'

And then execute:

$ bundle

Or install it yourself as:

$ gem install attr_uuid

Usage

1. In a migration file, prevent generate id column and add uuid column (tinyblob).

   class CreateUsers < ActiveRecord::Migration
       def up
           create_table :users, :id => false do |t|
               t.column :uuid, :tinyblob
               t.string :user_name
           end
           execute "ALTER TABLE users ADD PRIMARY KEY (`uuid`(16))"
       end
       def down
           drop_table :users
       end
   end
   

2. Change primary_key to uuid, and call attr_uuid method in a model class. When you pass autofill: true to attr_uuid, it hooks before_create callback to set automatically generated uuid as 16 byte binary data to id attirbute.

   class User < ActiveRecord::Base
       self.primary_key = "uuid"
       attr_uuid :id, column_name: "uuid", autofill: true
   end
   

3. attr_uuid adds #hex_id, #hex_id=, #formatted_id and #formatted_id= to the model to refer formatted uuid.

   user = User.create(:user_name => "foo")
   user.id  #=> "3~\x05v\xCBfAQ\xA2\xE1\xE0\xFC\x04\xFB3\xD1"
   user.hex_id  #=> "337e0576cb664151a2e1e0fc04fb33d1"
   user.formatted_id  #=> "337e0576-cb66-4151-a2e1-e0fc04fb33d1"
   
   user.hex_id = "9f648b40fa6e11e3a3ac0800200c9a66"
   user.id  #=> "\x9Fd\x8B@\xFAn\x11\xE3\xA3\xAC\b\x00 \f\x9Af"
   user.formatted_id  #=> "9f648b40-fa6e-11e3-a3ac-0800200c9a66"
   

4. attr_uuid also adds .find_by_hex_id and .find_by_formatted_id method to retrive model from data store with an uuid string.

   User.find_by_hex_id("337e0576cb664151a2e1e0fc04fb33d1")
   User.find_by_formatted_id("337e0576-cb66-4151-a2e1-e0fc04fb33d1")
   

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request